diff --git a/crates/agent/src/discovers/specs.rs b/crates/agent/src/discovers/specs.rs
index 18df28fbcd..10b7c9e612 100644
--- a/crates/agent/src/discovers/specs.rs
+++ b/crates/agent/src/discovers/specs.rs
@@ -158,6 +158,7 @@ pub fn merge_capture(
                 target: models::Collection::new(format!("{capture_prefix}/{recommended_name}")),
                 disable: discovered_binding.disable,
                 resource: models::RawValue::from_value(&resource),
+                backfill: 0,
             });
             filtered_bindings.push(discovered_binding);
         }
diff --git a/crates/agent/src/publications/linked_materializations.rs b/crates/agent/src/publications/linked_materializations.rs
index 1a0c7bc644..c4a7f5eb6d 100644
--- a/crates/agent/src/publications/linked_materializations.rs
+++ b/crates/agent/src/publications/linked_materializations.rs
@@ -312,6 +312,7 @@ async fn update_linked_materialization(
             disable: false,
             fields: Default::default(),
             priority: Default::default(),
+            backfill: 0,
         };
         materialization.bindings.push(binding);
     }
diff --git a/crates/assemble/src/lib.rs b/crates/assemble/src/lib.rs
index bc29f163b0..82ea4cd0d4 100644
--- a/crates/assemble/src/lib.rs
+++ b/crates/assemble/src/lib.rs
@@ -526,21 +526,25 @@ fn push_partitions(fields: &BTreeMap<String, Vec<Value>>, out: &mut Vec<broker::
     }
 }
 
-/// `encode_resource_path` encodes path components into a string which is
-/// suitable for use within a Gazette path, such as a Journal name or suffix, or
-/// a Shard ID.
+/// `encode_state_key` encodes resource path components and a backfill counter
+/// into a stable string value which is suited for indexing within a persistent
+/// binding state, such as a Flow runtime checkpoint or a connector state.
 ///
-/// Paths are restricted to unicode letters and numbers, plus the symbols
-/// `-_+/.=%`.  All other runes are percent-encoded.
+/// State keys have a restricted set of allowed characters, due to the way
+/// they're represented within Flow runtime checkpoints and, internal to those
+/// checkpoints, as suffixes attached to Gazette Journal names.
+///
+/// State keys are restricted to unicode letters and numbers, plus the symbols
+/// `-_+.=`.  All other runes are percent-encoded.
 ///
 /// See Gazette for more details:
 /// - Path Tokens: broker/protocol/validator.go
 /// - Path Validation Rules: broker/protocol/journal_spec_extensions.go
-pub fn encode_resource_path(resource_path: &[impl AsRef<str>]) -> String {
+pub fn encode_state_key(resource_path: &[impl AsRef<str>], backfill: u32) -> String {
     let mut parts = Vec::new();
     parts.extend(resource_path.iter().map(AsRef::as_ref));
 
-    let mut name = String::new();
+    let mut key = String::new();
 
     for c in parts.join("/").chars() {
         match c {
@@ -549,16 +553,20 @@ pub fn encode_resource_path(resource_path: &[impl AsRef<str>]) -> String {
             // certain positions, no repeats, etc. As a resource_path
             // potentially contains arbitrary user input, we percent encode any
             // `/` characters here to avoid duplicating that validation logic.
-            '-' | '_' | '+' | '.' | '=' => name.push(c),
-            _ if c.is_alphanumeric() => name.push(c),
-            c => name.extend(percent_encoding::utf8_percent_encode(
+            '-' | '_' | '+' | '.' | '=' => key.push(c),
+            _ if c.is_alphanumeric() => key.push(c),
+            c => key.extend(percent_encoding::utf8_percent_encode(
                 &c.to_string(),
                 percent_encoding::NON_ALPHANUMERIC,
             )),
         }
     }
 
-    name
+    if backfill != 0 {
+        key.extend(format!(".v{backfill}").chars());
+    }
+
+    key
 }
 
 pub fn compression_codec(t: models::CompressionCodec) -> broker::CompressionCodec {
@@ -650,18 +658,28 @@ mod test {
     }
 
     #[test]
-    fn test_name_escapes() {
-        let out = encode_resource_path(&vec![
-            "he!lo৬".to_string(),
-            "a/part%".to_string(),
-            "_¾the-=res+.".to_string(),
-        ]);
-        assert_eq!(&out, "he%21lo৬%2Fa%2Fpart%25%2F_¾the-=res+.");
+    fn test_state_key_escapes() {
+        let out = encode_state_key(&["table"], 0);
+        assert_eq!(&out, "table");
+        let out = encode_state_key(&["public", "table"], 0);
+        assert_eq!(&out, "public%2Ftable");
+        let out = encode_state_key(&["public", "table"], 1);
+        assert_eq!(&out, "public%2Ftable.v1");
+
+        let out = encode_state_key(
+            &vec![
+                "he!lo৬".to_string(),
+                "a/part%".to_string(),
+                "_¾the-=res+.".to_string(),
+            ],
+            3,
+        );
+        assert_eq!(&out, "he%21lo৬%2Fa%2Fpart%25%2F_¾the-=res+..v3");
 
         let gross_url =
             "http://user:password@foo.bar.example.com:9000/hooks///baz?type=critical&test=true";
-        let out = encode_resource_path(&vec!["prefix".to_string(), gross_url.to_string()]);
-        assert_eq!(&out, "prefix%2Fhttp%3A%2F%2Fuser%3Apassword%40foo.bar.example.com%3A9000%2Fhooks%2F%2F%2Fbaz%3Ftype=critical%26test=true");
+        let out = encode_state_key(&vec!["prefix".to_string(), gross_url.to_string()], 42);
+        assert_eq!(&out, "prefix%2Fhttp%3A%2F%2Fuser%3Apassword%40foo.bar.example.com%3A9000%2Fhooks%2F%2F%2Fbaz%3Ftype=critical%26test=true.v42");
     }
 
     #[test]
diff --git a/crates/derive-sqlite/src/validate.rs b/crates/derive-sqlite/src/validate.rs
index 91757de668..33c049570d 100644
--- a/crates/derive-sqlite/src/validate.rs
+++ b/crates/derive-sqlite/src/validate.rs
@@ -29,6 +29,7 @@ pub fn parse_validate(
                 collection: source,
                 lambda_config_json,
                 shuffle_lambda_config_json: _,
+                backfill: _,
             } = transform;
 
             let source = source.as_ref().unwrap();
diff --git a/crates/flowctl/src/raw/discover.rs b/crates/flowctl/src/raw/discover.rs
index 0d56a46715..9da3099066 100644
--- a/crates/flowctl/src/raw/discover.rs
+++ b/crates/flowctl/src/raw/discover.rs
@@ -129,6 +129,7 @@ pub async fn do_discover(
             target: collection.clone(),
             disable: false,
             resource: models::RawValue::from_string(binding.resource_config_json)?,
+            backfill: 0,
         });
 
         collections.insert(
diff --git a/crates/json/src/schema/formats.rs b/crates/json/src/schema/formats.rs
index 3c00d49897..4e38dbdc05 100644
--- a/crates/json/src/schema/formats.rs
+++ b/crates/json/src/schema/formats.rs
@@ -44,6 +44,7 @@ pub enum Format {
     Regex,
     #[serde(rename = "relative-json-pointer")]
     RelativeJsonPointer,
+    #[serde(alias = "uint32", alias = "uint64")]
     Integer,
     Number,
 }
@@ -266,6 +267,8 @@ mod test {
             ("integer", "1_234", true),
             ("integer", "1.234", false),
             ("integer", " 1234", false),
+            ("uint32", "1234", true),
+            ("uint64", "1234", true),
             ("number", "1234", true),
             ("number", "-1234", true),
             ("number", "1_234", true),
diff --git a/crates/models/src/captures.rs b/crates/models/src/captures.rs
index 37d7a1446c..edcf957640 100644
--- a/crates/models/src/captures.rs
+++ b/crates/models/src/captures.rs
@@ -81,6 +81,18 @@ pub struct CaptureBinding {
     // target, we should turn this into a Target enum as has already been done
     // with Source (used by Materialization & Derive).
     pub target: Collection,
+    /// # Backfill counter for this binding.
+    /// Every increment of this counter will result in a new backfill of this
+    /// binding from the captured endpoint. For example when capturing from a
+    /// SQL table, incrementing this counter will cause the table to be
+    /// re-captured in its entirety from the source database.
+    ///
+    /// Note that a backfill does *not* truncate the target collection,
+    /// and documents published by a backfilled binding will coexist with
+    /// (and be ordered after) any documents which were published as part
+    /// of a preceding backfill.
+    #[serde(default, skip_serializing_if = "super::is_u32_zero")]
+    pub backfill: u32,
 }
 
 impl CaptureDef {
@@ -111,6 +123,7 @@ impl CaptureBinding {
             resource: serde_json::from_value(json!({"stream": "a_stream"})).unwrap(),
             disable: false,
             target: Collection::new("target/collection"),
+            backfill: 0,
         }
     }
 }
diff --git a/crates/models/src/derivation.rs b/crates/models/src/derivation.rs
index 2b60dab409..47521ea5ab 100644
--- a/crates/models/src/derivation.rs
+++ b/crates/models/src/derivation.rs
@@ -84,11 +84,21 @@ pub struct TransformDef {
     /// or as a relative URL to a file containing the lambda.
     #[serde(default, skip_serializing_if = "RawValue::is_null")]
     pub lambda: RawValue,
-
     /// # Whether to disable this transform.
     /// Disabled transforms are completely ignored at runtime and are not validated.
     #[serde(default, skip_serializing_if = "super::is_false")]
     pub disable: bool,
+    /// # Backfill counter for this transform.
+    /// Every increment of this counter will result in a new backfill of this
+    /// transform. Specifically, the transform's lambda will be re-invoked for
+    /// every applicable document of its source collection.
+    ///
+    /// Note that a backfill does *not* truncate the derived collection,
+    /// and documents published by a backfilled transform will coexist with
+    /// (and be ordered after) any documents which were published as part
+    /// of a preceding backfill.
+    #[serde(default, skip_serializing_if = "super::is_u32_zero")]
+    pub backfill: u32,
 }
 
 /// A Shuffle specifies how a shuffling key is to be extracted from
diff --git a/crates/models/src/lib.rs b/crates/models/src/lib.rs
index 7fa1724acd..05c3ec2bb9 100644
--- a/crates/models/src/lib.rs
+++ b/crates/models/src/lib.rs
@@ -62,3 +62,7 @@ fn option_datetime_schema(_: &mut schemars::gen::SchemaGenerator) -> schemars::s
 fn is_false(b: &bool) -> bool {
     !*b
 }
+
+fn is_u32_zero(u: &u32) -> bool {
+    *u == 0
+}
diff --git a/crates/models/src/materializations.rs b/crates/models/src/materializations.rs
index 5041138b65..452bb19d2c 100644
--- a/crates/models/src/materializations.rs
+++ b/crates/models/src/materializations.rs
@@ -62,6 +62,14 @@ pub struct MaterializationBinding {
     /// # Selected projections for this materialization.
     #[serde(default)]
     pub fields: MaterializationFields,
+    /// # Backfill counter for this binding.
+    /// Every increment of this counter will result in a new backfill of this
+    /// binding from its source collection to its materialized resource.
+    /// For example when materializing to a SQL table, incrementing this counter
+    /// causes the table to be dropped and then rebuilt by re-reading the source
+    /// collection.
+    #[serde(default, skip_serializing_if = "super::is_u32_zero")]
+    pub backfill: u32,
 }
 
 /// MaterializationFields defines a selection of projections to materialize,
@@ -104,6 +112,7 @@ impl MaterializationBinding {
             disable: false,
             priority: 0,
             fields: MaterializationFields::default(),
+            backfill: 0,
         }
     }
 
diff --git a/crates/proto-flow/src/capture.rs b/crates/proto-flow/src/capture.rs
index b333206202..c54be53962 100644
--- a/crates/proto-flow/src/capture.rs
+++ b/crates/proto-flow/src/capture.rs
@@ -89,6 +89,9 @@ pub mod request {
             pub collection: ::core::option::Option<
                 super::super::super::flow::CollectionSpec,
             >,
+            /// Backfill counter for this binding.
+            #[prost(uint32, tag = "3")]
+            pub backfill: u32,
         }
     }
     /// Apply a capture configuration and bindings to its endpoint.
diff --git a/crates/proto-flow/src/capture.serde.rs b/crates/proto-flow/src/capture.serde.rs
index 1d2c1ae3b8..b34289fc39 100644
--- a/crates/proto-flow/src/capture.serde.rs
+++ b/crates/proto-flow/src/capture.serde.rs
@@ -940,6 +940,9 @@ impl serde::Serialize for request::validate::Binding {
         if self.collection.is_some() {
             len += 1;
         }
+        if self.backfill != 0 {
+            len += 1;
+        }
         let mut struct_ser = serializer.serialize_struct("capture.Request.Validate.Binding", len)?;
         if !self.resource_config_json.is_empty() {
             struct_ser.serialize_field("resourceConfig", crate::as_raw_json(&self.resource_config_json)?)?;
@@ -947,6 +950,9 @@ impl serde::Serialize for request::validate::Binding {
         if let Some(v) = self.collection.as_ref() {
             struct_ser.serialize_field("collection", v)?;
         }
+        if self.backfill != 0 {
+            struct_ser.serialize_field("backfill", &self.backfill)?;
+        }
         struct_ser.end()
     }
 }
@@ -960,12 +966,14 @@ impl<'de> serde::Deserialize<'de> for request::validate::Binding {
             "resource_config_json",
             "resourceConfig",
             "collection",
+            "backfill",
         ];
 
         #[allow(clippy::enum_variant_names)]
         enum GeneratedField {
             ResourceConfigJson,
             Collection,
+            Backfill,
         }
         impl<'de> serde::Deserialize<'de> for GeneratedField {
             fn deserialize<D>(deserializer: D) -> std::result::Result<GeneratedField, D::Error>
@@ -989,6 +997,7 @@ impl<'de> serde::Deserialize<'de> for request::validate::Binding {
                         match value {
                             "resourceConfig" | "resource_config_json" => Ok(GeneratedField::ResourceConfigJson),
                             "collection" => Ok(GeneratedField::Collection),
+                            "backfill" => Ok(GeneratedField::Backfill),
                             _ => Err(serde::de::Error::unknown_field(value, FIELDS)),
                         }
                     }
@@ -1010,6 +1019,7 @@ impl<'de> serde::Deserialize<'de> for request::validate::Binding {
             {
                 let mut resource_config_json__ : Option<Box<serde_json::value::RawValue>> = None;
                 let mut collection__ = None;
+                let mut backfill__ = None;
                 while let Some(k) = map.next_key()? {
                     match k {
                         GeneratedField::ResourceConfigJson => {
@@ -1024,11 +1034,20 @@ impl<'de> serde::Deserialize<'de> for request::validate::Binding {
                             }
                             collection__ = map.next_value()?;
                         }
+                        GeneratedField::Backfill => {
+                            if backfill__.is_some() {
+                                return Err(serde::de::Error::duplicate_field("backfill"));
+                            }
+                            backfill__ = 
+                                Some(map.next_value::<::pbjson::private::NumberDeserialize<_>>()?.0)
+                            ;
+                        }
                     }
                 }
                 Ok(request::validate::Binding {
                     resource_config_json: resource_config_json__.map(|r| Box::<str>::from(r).into()).unwrap_or_default(),
                     collection: collection__,
+                    backfill: backfill__.unwrap_or_default(),
                 })
             }
         }
diff --git a/crates/proto-flow/src/derive.rs b/crates/proto-flow/src/derive.rs
index 2ccb9ca68b..0a0645121e 100644
--- a/crates/proto-flow/src/derive.rs
+++ b/crates/proto-flow/src/derive.rs
@@ -105,6 +105,9 @@ pub mod request {
             /// JSON-encoded object which specifies the lambda configuration.
             #[prost(string, tag = "4")]
             pub lambda_config_json: ::prost::alloc::string::String,
+            /// Backfill counter for this transform.
+            #[prost(uint32, tag = "5")]
+            pub backfill: u32,
         }
     }
     /// Open a derivation stream.
diff --git a/crates/proto-flow/src/derive.serde.rs b/crates/proto-flow/src/derive.serde.rs
index 290cdff1f2..7870047b76 100644
--- a/crates/proto-flow/src/derive.serde.rs
+++ b/crates/proto-flow/src/derive.serde.rs
@@ -1202,6 +1202,9 @@ impl serde::Serialize for request::validate::Transform {
         if !self.lambda_config_json.is_empty() {
             len += 1;
         }
+        if self.backfill != 0 {
+            len += 1;
+        }
         let mut struct_ser = serializer.serialize_struct("derive.Request.Validate.Transform", len)?;
         if !self.name.is_empty() {
             struct_ser.serialize_field("name", &self.name)?;
@@ -1215,6 +1218,9 @@ impl serde::Serialize for request::validate::Transform {
         if !self.lambda_config_json.is_empty() {
             struct_ser.serialize_field("lambdaConfig", crate::as_raw_json(&self.lambda_config_json)?)?;
         }
+        if self.backfill != 0 {
+            struct_ser.serialize_field("backfill", &self.backfill)?;
+        }
         struct_ser.end()
     }
 }
@@ -1231,6 +1237,7 @@ impl<'de> serde::Deserialize<'de> for request::validate::Transform {
             "shuffleLambdaConfig",
             "lambda_config_json",
             "lambdaConfig",
+            "backfill",
         ];
 
         #[allow(clippy::enum_variant_names)]
@@ -1239,6 +1246,7 @@ impl<'de> serde::Deserialize<'de> for request::validate::Transform {
             Collection,
             ShuffleLambdaConfigJson,
             LambdaConfigJson,
+            Backfill,
         }
         impl<'de> serde::Deserialize<'de> for GeneratedField {
             fn deserialize<D>(deserializer: D) -> std::result::Result<GeneratedField, D::Error>
@@ -1264,6 +1272,7 @@ impl<'de> serde::Deserialize<'de> for request::validate::Transform {
                             "collection" => Ok(GeneratedField::Collection),
                             "shuffleLambdaConfig" | "shuffle_lambda_config_json" => Ok(GeneratedField::ShuffleLambdaConfigJson),
                             "lambdaConfig" | "lambda_config_json" => Ok(GeneratedField::LambdaConfigJson),
+                            "backfill" => Ok(GeneratedField::Backfill),
                             _ => Err(serde::de::Error::unknown_field(value, FIELDS)),
                         }
                     }
@@ -1287,6 +1296,7 @@ impl<'de> serde::Deserialize<'de> for request::validate::Transform {
                 let mut collection__ = None;
                 let mut shuffle_lambda_config_json__ : Option<Box<serde_json::value::RawValue>> = None;
                 let mut lambda_config_json__ : Option<Box<serde_json::value::RawValue>> = None;
+                let mut backfill__ = None;
                 while let Some(k) = map.next_key()? {
                     match k {
                         GeneratedField::Name => {
@@ -1313,6 +1323,14 @@ impl<'de> serde::Deserialize<'de> for request::validate::Transform {
                             }
                             lambda_config_json__ = Some(map.next_value()?);
                         }
+                        GeneratedField::Backfill => {
+                            if backfill__.is_some() {
+                                return Err(serde::de::Error::duplicate_field("backfill"));
+                            }
+                            backfill__ = 
+                                Some(map.next_value::<::pbjson::private::NumberDeserialize<_>>()?.0)
+                            ;
+                        }
                     }
                 }
                 Ok(request::validate::Transform {
@@ -1320,6 +1338,7 @@ impl<'de> serde::Deserialize<'de> for request::validate::Transform {
                     collection: collection__,
                     shuffle_lambda_config_json: shuffle_lambda_config_json__.map(|r| Box::<str>::from(r).into()).unwrap_or_default(),
                     lambda_config_json: lambda_config_json__.map(|r| Box::<str>::from(r).into()).unwrap_or_default(),
+                    backfill: backfill__.unwrap_or_default(),
                 })
             }
         }
diff --git a/crates/proto-flow/src/flow.rs b/crates/proto-flow/src/flow.rs
index 01eceb5f78..5281af92e2 100644
--- a/crates/proto-flow/src/flow.rs
+++ b/crates/proto-flow/src/flow.rs
@@ -249,7 +249,7 @@ pub mod collection_spec {
     pub mod derivation {
         /// Transforms of the derivation.
         ///
-        /// Next tag: 13.
+        /// Next tag: 14.
         #[allow(clippy::derive_partial_eq_without_eq)]
         #[derive(Clone, PartialEq, ::prost::Message)]
         pub struct Transform {
@@ -295,6 +295,10 @@ pub mod collection_spec {
             /// When set, documents after this timestamp are not processed.
             #[prost(message, optional, tag = "12")]
             pub not_after: ::core::option::Option<::pbjson_types::Timestamp>,
+            /// Backfill counter for this transform.
+            /// Every increment of this counter results in a new backfill.
+            #[prost(uint32, tag = "13")]
+            pub backfill: u32,
         }
         #[derive(
             Clone,
@@ -444,6 +448,8 @@ pub mod capture_spec {
     /// Bindings of endpoint resources and collections into which they're captured.
     /// Bindings are ordered and unique on the bound collection name,
     /// and are also unique on the resource path.
+    ///
+    /// Next tag: 6.
     #[allow(clippy::derive_partial_eq_without_eq)]
     #[derive(Clone, PartialEq, ::prost::Message)]
     pub struct Binding {
@@ -457,6 +463,13 @@ pub mod capture_spec {
         /// Collection to be captured into.
         #[prost(message, optional, tag = "3")]
         pub collection: ::core::option::Option<super::CollectionSpec>,
+        /// Backfill counter for this binding.
+        /// Every increment of this counter results in a new backfill.
+        #[prost(uint32, tag = "4")]
+        pub backfill: u32,
+        /// A suggested key to use for this binding within connector states.
+        #[prost(string, tag = "5")]
+        pub state_key: ::prost::alloc::string::String,
     }
     /// Type of the capture's connector.
     #[derive(
@@ -532,7 +545,7 @@ pub mod materialization_spec {
     /// materialized. Bindings are ordered and unique on the bound collection name,
     /// and are also unique on the resource path.
     ///
-    /// Next tag: 12.
+    /// Next tag: 14.
     #[allow(clippy::derive_partial_eq_without_eq)]
     #[derive(Clone, PartialEq, ::prost::Message)]
     pub struct Binding {
@@ -573,6 +586,13 @@ pub mod materialization_spec {
         /// When set, documents after this timestamp are not processed.
         #[prost(message, optional, tag = "11")]
         pub not_after: ::core::option::Option<::pbjson_types::Timestamp>,
+        /// Backfill counter for this binding.
+        /// Every increment of this counter results in a new backfill.
+        #[prost(uint32, tag = "12")]
+        pub backfill: u32,
+        /// A suggested key to use for this binding within connector state.
+        #[prost(string, tag = "13")]
+        pub state_key: ::prost::alloc::string::String,
     }
     /// Nested message and enum types in `Binding`.
     pub mod binding {
diff --git a/crates/proto-flow/src/flow.serde.rs b/crates/proto-flow/src/flow.serde.rs
index e97eff7b52..e6c823d63d 100644
--- a/crates/proto-flow/src/flow.serde.rs
+++ b/crates/proto-flow/src/flow.serde.rs
@@ -654,6 +654,12 @@ impl serde::Serialize for capture_spec::Binding {
         if self.collection.is_some() {
             len += 1;
         }
+        if self.backfill != 0 {
+            len += 1;
+        }
+        if !self.state_key.is_empty() {
+            len += 1;
+        }
         let mut struct_ser = serializer.serialize_struct("flow.CaptureSpec.Binding", len)?;
         if !self.resource_config_json.is_empty() {
             struct_ser.serialize_field("resourceConfig", crate::as_raw_json(&self.resource_config_json)?)?;
@@ -664,6 +670,12 @@ impl serde::Serialize for capture_spec::Binding {
         if let Some(v) = self.collection.as_ref() {
             struct_ser.serialize_field("collection", v)?;
         }
+        if self.backfill != 0 {
+            struct_ser.serialize_field("backfill", &self.backfill)?;
+        }
+        if !self.state_key.is_empty() {
+            struct_ser.serialize_field("stateKey", &self.state_key)?;
+        }
         struct_ser.end()
     }
 }
@@ -679,6 +691,9 @@ impl<'de> serde::Deserialize<'de> for capture_spec::Binding {
             "resource_path",
             "resourcePath",
             "collection",
+            "backfill",
+            "state_key",
+            "stateKey",
         ];
 
         #[allow(clippy::enum_variant_names)]
@@ -686,6 +701,8 @@ impl<'de> serde::Deserialize<'de> for capture_spec::Binding {
             ResourceConfigJson,
             ResourcePath,
             Collection,
+            Backfill,
+            StateKey,
         }
         impl<'de> serde::Deserialize<'de> for GeneratedField {
             fn deserialize<D>(deserializer: D) -> std::result::Result<GeneratedField, D::Error>
@@ -710,6 +727,8 @@ impl<'de> serde::Deserialize<'de> for capture_spec::Binding {
                             "resourceConfig" | "resource_config_json" => Ok(GeneratedField::ResourceConfigJson),
                             "resourcePath" | "resource_path" => Ok(GeneratedField::ResourcePath),
                             "collection" => Ok(GeneratedField::Collection),
+                            "backfill" => Ok(GeneratedField::Backfill),
+                            "stateKey" | "state_key" => Ok(GeneratedField::StateKey),
                             _ => Err(serde::de::Error::unknown_field(value, FIELDS)),
                         }
                     }
@@ -732,6 +751,8 @@ impl<'de> serde::Deserialize<'de> for capture_spec::Binding {
                 let mut resource_config_json__ : Option<Box<serde_json::value::RawValue>> = None;
                 let mut resource_path__ = None;
                 let mut collection__ = None;
+                let mut backfill__ = None;
+                let mut state_key__ = None;
                 while let Some(k) = map.next_key()? {
                     match k {
                         GeneratedField::ResourceConfigJson => {
@@ -752,12 +773,28 @@ impl<'de> serde::Deserialize<'de> for capture_spec::Binding {
                             }
                             collection__ = map.next_value()?;
                         }
+                        GeneratedField::Backfill => {
+                            if backfill__.is_some() {
+                                return Err(serde::de::Error::duplicate_field("backfill"));
+                            }
+                            backfill__ = 
+                                Some(map.next_value::<::pbjson::private::NumberDeserialize<_>>()?.0)
+                            ;
+                        }
+                        GeneratedField::StateKey => {
+                            if state_key__.is_some() {
+                                return Err(serde::de::Error::duplicate_field("stateKey"));
+                            }
+                            state_key__ = Some(map.next_value()?);
+                        }
                     }
                 }
                 Ok(capture_spec::Binding {
                     resource_config_json: resource_config_json__.map(|r| Box::<str>::from(r).into()).unwrap_or_default(),
                     resource_path: resource_path__.unwrap_or_default(),
                     collection: collection__,
+                    backfill: backfill__.unwrap_or_default(),
+                    state_key: state_key__.unwrap_or_default(),
                 })
             }
         }
@@ -1500,6 +1537,9 @@ impl serde::Serialize for collection_spec::derivation::Transform {
         if self.not_after.is_some() {
             len += 1;
         }
+        if self.backfill != 0 {
+            len += 1;
+        }
         let mut struct_ser = serializer.serialize_struct("flow.CollectionSpec.Derivation.Transform", len)?;
         if !self.name.is_empty() {
             struct_ser.serialize_field("name", &self.name)?;
@@ -1537,6 +1577,9 @@ impl serde::Serialize for collection_spec::derivation::Transform {
         if let Some(v) = self.not_after.as_ref() {
             struct_ser.serialize_field("notAfter", v)?;
         }
+        if self.backfill != 0 {
+            struct_ser.serialize_field("backfill", &self.backfill)?;
+        }
         struct_ser.end()
     }
 }
@@ -1568,6 +1611,7 @@ impl<'de> serde::Deserialize<'de> for collection_spec::derivation::Transform {
             "notBefore",
             "not_after",
             "notAfter",
+            "backfill",
         ];
 
         #[allow(clippy::enum_variant_names)]
@@ -1584,6 +1628,7 @@ impl<'de> serde::Deserialize<'de> for collection_spec::derivation::Transform {
             JournalReadSuffix,
             NotBefore,
             NotAfter,
+            Backfill,
         }
         impl<'de> serde::Deserialize<'de> for GeneratedField {
             fn deserialize<D>(deserializer: D) -> std::result::Result<GeneratedField, D::Error>
@@ -1617,6 +1662,7 @@ impl<'de> serde::Deserialize<'de> for collection_spec::derivation::Transform {
                             "journalReadSuffix" | "journal_read_suffix" => Ok(GeneratedField::JournalReadSuffix),
                             "notBefore" | "not_before" => Ok(GeneratedField::NotBefore),
                             "notAfter" | "not_after" => Ok(GeneratedField::NotAfter),
+                            "backfill" => Ok(GeneratedField::Backfill),
                             _ => Err(serde::de::Error::unknown_field(value, FIELDS)),
                         }
                     }
@@ -1648,6 +1694,7 @@ impl<'de> serde::Deserialize<'de> for collection_spec::derivation::Transform {
                 let mut journal_read_suffix__ = None;
                 let mut not_before__ = None;
                 let mut not_after__ = None;
+                let mut backfill__ = None;
                 while let Some(k) = map.next_key()? {
                     match k {
                         GeneratedField::Name => {
@@ -1726,6 +1773,14 @@ impl<'de> serde::Deserialize<'de> for collection_spec::derivation::Transform {
                             }
                             not_after__ = map.next_value()?;
                         }
+                        GeneratedField::Backfill => {
+                            if backfill__.is_some() {
+                                return Err(serde::de::Error::duplicate_field("backfill"));
+                            }
+                            backfill__ = 
+                                Some(map.next_value::<::pbjson::private::NumberDeserialize<_>>()?.0)
+                            ;
+                        }
                     }
                 }
                 Ok(collection_spec::derivation::Transform {
@@ -1741,6 +1796,7 @@ impl<'de> serde::Deserialize<'de> for collection_spec::derivation::Transform {
                     journal_read_suffix: journal_read_suffix__.unwrap_or_default(),
                     not_before: not_before__,
                     not_after: not_after__,
+                    backfill: backfill__.unwrap_or_default(),
                 })
             }
         }
@@ -3908,6 +3964,12 @@ impl serde::Serialize for materialization_spec::Binding {
         if self.not_after.is_some() {
             len += 1;
         }
+        if self.backfill != 0 {
+            len += 1;
+        }
+        if !self.state_key.is_empty() {
+            len += 1;
+        }
         let mut struct_ser = serializer.serialize_struct("flow.MaterializationSpec.Binding", len)?;
         if !self.resource_config_json.is_empty() {
             struct_ser.serialize_field("resourceConfig", crate::as_raw_json(&self.resource_config_json)?)?;
@@ -3942,6 +4004,12 @@ impl serde::Serialize for materialization_spec::Binding {
         if let Some(v) = self.not_after.as_ref() {
             struct_ser.serialize_field("notAfter", v)?;
         }
+        if self.backfill != 0 {
+            struct_ser.serialize_field("backfill", &self.backfill)?;
+        }
+        if !self.state_key.is_empty() {
+            struct_ser.serialize_field("stateKey", &self.state_key)?;
+        }
         struct_ser.end()
     }
 }
@@ -3972,6 +4040,9 @@ impl<'de> serde::Deserialize<'de> for materialization_spec::Binding {
             "notBefore",
             "not_after",
             "notAfter",
+            "backfill",
+            "state_key",
+            "stateKey",
         ];
 
         #[allow(clippy::enum_variant_names)]
@@ -3987,6 +4058,8 @@ impl<'de> serde::Deserialize<'de> for materialization_spec::Binding {
             JournalReadSuffix,
             NotBefore,
             NotAfter,
+            Backfill,
+            StateKey,
         }
         impl<'de> serde::Deserialize<'de> for GeneratedField {
             fn deserialize<D>(deserializer: D) -> std::result::Result<GeneratedField, D::Error>
@@ -4019,6 +4092,8 @@ impl<'de> serde::Deserialize<'de> for materialization_spec::Binding {
                             "journalReadSuffix" | "journal_read_suffix" => Ok(GeneratedField::JournalReadSuffix),
                             "notBefore" | "not_before" => Ok(GeneratedField::NotBefore),
                             "notAfter" | "not_after" => Ok(GeneratedField::NotAfter),
+                            "backfill" => Ok(GeneratedField::Backfill),
+                            "stateKey" | "state_key" => Ok(GeneratedField::StateKey),
                             _ => Err(serde::de::Error::unknown_field(value, FIELDS)),
                         }
                     }
@@ -4049,6 +4124,8 @@ impl<'de> serde::Deserialize<'de> for materialization_spec::Binding {
                 let mut journal_read_suffix__ = None;
                 let mut not_before__ = None;
                 let mut not_after__ = None;
+                let mut backfill__ = None;
+                let mut state_key__ = None;
                 while let Some(k) = map.next_key()? {
                     match k {
                         GeneratedField::ResourceConfigJson => {
@@ -4119,6 +4196,20 @@ impl<'de> serde::Deserialize<'de> for materialization_spec::Binding {
                             }
                             not_after__ = map.next_value()?;
                         }
+                        GeneratedField::Backfill => {
+                            if backfill__.is_some() {
+                                return Err(serde::de::Error::duplicate_field("backfill"));
+                            }
+                            backfill__ = 
+                                Some(map.next_value::<::pbjson::private::NumberDeserialize<_>>()?.0)
+                            ;
+                        }
+                        GeneratedField::StateKey => {
+                            if state_key__.is_some() {
+                                return Err(serde::de::Error::duplicate_field("stateKey"));
+                            }
+                            state_key__ = Some(map.next_value()?);
+                        }
                     }
                 }
                 Ok(materialization_spec::Binding {
@@ -4133,6 +4224,8 @@ impl<'de> serde::Deserialize<'de> for materialization_spec::Binding {
                     journal_read_suffix: journal_read_suffix__.unwrap_or_default(),
                     not_before: not_before__,
                     not_after: not_after__,
+                    backfill: backfill__.unwrap_or_default(),
+                    state_key: state_key__.unwrap_or_default(),
                 })
             }
         }
diff --git a/crates/proto-flow/src/materialize.rs b/crates/proto-flow/src/materialize.rs
index 8a26435d23..61d89794f6 100644
--- a/crates/proto-flow/src/materialize.rs
+++ b/crates/proto-flow/src/materialize.rs
@@ -88,6 +88,9 @@ pub mod request {
                 ::prost::alloc::string::String,
                 ::prost::alloc::string::String,
             >,
+            /// Backfill counter for this binding.
+            #[prost(uint32, tag = "4")]
+            pub backfill: u32,
         }
     }
     /// Apply a materialization configuration and bindings to its endpoint.
diff --git a/crates/proto-flow/src/materialize.serde.rs b/crates/proto-flow/src/materialize.serde.rs
index b524f2ab5e..f842c77983 100644
--- a/crates/proto-flow/src/materialize.serde.rs
+++ b/crates/proto-flow/src/materialize.serde.rs
@@ -1650,6 +1650,9 @@ impl serde::Serialize for request::validate::Binding {
         if !self.field_config_json_map.is_empty() {
             len += 1;
         }
+        if self.backfill != 0 {
+            len += 1;
+        }
         let mut struct_ser = serializer.serialize_struct("materialize.Request.Validate.Binding", len)?;
         if !self.resource_config_json.is_empty() {
             struct_ser.serialize_field("resourceConfig", crate::as_raw_json(&self.resource_config_json)?)?;
@@ -1660,6 +1663,9 @@ impl serde::Serialize for request::validate::Binding {
         if !self.field_config_json_map.is_empty() {
             struct_ser.serialize_field("fieldConfig", &crate::as_raw_json_map(&self.field_config_json_map)?)?;
         }
+        if self.backfill != 0 {
+            struct_ser.serialize_field("backfill", &self.backfill)?;
+        }
         struct_ser.end()
     }
 }
@@ -1675,6 +1681,7 @@ impl<'de> serde::Deserialize<'de> for request::validate::Binding {
             "collection",
             "field_config_json_map",
             "fieldConfig",
+            "backfill",
         ];
 
         #[allow(clippy::enum_variant_names)]
@@ -1682,6 +1689,7 @@ impl<'de> serde::Deserialize<'de> for request::validate::Binding {
             ResourceConfigJson,
             Collection,
             FieldConfigJsonMap,
+            Backfill,
         }
         impl<'de> serde::Deserialize<'de> for GeneratedField {
             fn deserialize<D>(deserializer: D) -> std::result::Result<GeneratedField, D::Error>
@@ -1706,6 +1714,7 @@ impl<'de> serde::Deserialize<'de> for request::validate::Binding {
                             "resourceConfig" | "resource_config_json" => Ok(GeneratedField::ResourceConfigJson),
                             "collection" => Ok(GeneratedField::Collection),
                             "fieldConfig" | "field_config_json_map" => Ok(GeneratedField::FieldConfigJsonMap),
+                            "backfill" => Ok(GeneratedField::Backfill),
                             _ => Err(serde::de::Error::unknown_field(value, FIELDS)),
                         }
                     }
@@ -1728,6 +1737,7 @@ impl<'de> serde::Deserialize<'de> for request::validate::Binding {
                 let mut resource_config_json__ : Option<Box<serde_json::value::RawValue>> = None;
                 let mut collection__ = None;
                 let mut field_config_json_map__ : Option<std::collections::BTreeMap<String, Box<serde_json::value::RawValue>>> = None;
+                let mut backfill__ = None;
                 while let Some(k) = map.next_key()? {
                     match k {
                         GeneratedField::ResourceConfigJson => {
@@ -1750,12 +1760,21 @@ impl<'de> serde::Deserialize<'de> for request::validate::Binding {
                                 map.next_value::<std::collections::BTreeMap<_, _>>()?
                             );
                         }
+                        GeneratedField::Backfill => {
+                            if backfill__.is_some() {
+                                return Err(serde::de::Error::duplicate_field("backfill"));
+                            }
+                            backfill__ = 
+                                Some(map.next_value::<::pbjson::private::NumberDeserialize<_>>()?.0)
+                            ;
+                        }
                     }
                 }
                 Ok(request::validate::Binding {
                     resource_config_json: resource_config_json__.map(|r| Box::<str>::from(r).into()).unwrap_or_default(),
                     collection: collection__,
                     field_config_json_map: field_config_json_map__.unwrap_or_default().into_iter().map(|(field, value)| (field, Box::<str>::from(value).into())).collect(),
+                    backfill: backfill__.unwrap_or_default(),
                 })
             }
         }
diff --git a/crates/proto-flow/tests/regression.rs b/crates/proto-flow/tests/regression.rs
index 127dd55129..a694cd1364 100644
--- a/crates/proto-flow/tests/regression.rs
+++ b/crates/proto-flow/tests/regression.rs
@@ -176,6 +176,8 @@ fn ex_capture_spec() -> flow::CaptureSpec {
             resource_config_json: json!({"resource": "config"}).to_string(),
             resource_path: vec!["some".to_string(), "path".to_string()],
             collection: Some(ex_collection_spec()),
+            backfill: 3,
+            state_key: "a%2Fcdc%2Ftable+baz.v3".to_string(),
         }],
         network_ports: ex_network_ports(),
     }
@@ -199,7 +201,7 @@ fn ex_derivation_spec() -> flow::CollectionSpec {
             read_only: true,
             shuffle_key: vec!["/shuffle".to_string(), "/key".to_string()],
             shuffle_lambda_config_json: json!("SELECT $shuffle, $key;").to_string(),
-            journal_read_suffix: "derive/a/collection/transform_name".to_string(),
+            journal_read_suffix: "derive/a/collection/transform_name.v2".to_string(),
             not_before: Some(pbjson_types::Timestamp {
                 seconds: 1691722827,
                 nanos: 0,
@@ -208,6 +210,7 @@ fn ex_derivation_spec() -> flow::CollectionSpec {
                 seconds: 1680000000,
                 nanos: 0,
             }),
+            backfill: 2,
         }],
         shuffle_key_types: vec![
             flow::collection_spec::derivation::ShuffleType::String as i32,
@@ -251,7 +254,7 @@ fn ex_materialization_spec() -> flow::MaterializationSpec {
             }),
             delta_updates: false,
             deprecated_shuffle: None,
-            journal_read_suffix: "materialize/acmeCo/materialization/some%20path".to_string(),
+            journal_read_suffix: "materialize/acmeCo/materialization/some%20path.v1".to_string(),
             not_before: Some(pbjson_types::Timestamp {
                 seconds: 1691722827,
                 nanos: 0,
@@ -260,6 +263,8 @@ fn ex_materialization_spec() -> flow::MaterializationSpec {
                 seconds: 1680000000,
                 nanos: 0,
             }),
+            backfill: 1,
+            state_key: "some%20path.v1".to_string(),
         }],
         network_ports: ex_network_ports(),
     }
@@ -369,6 +374,7 @@ fn ex_capture_request() -> capture::Request {
             bindings: vec![capture::request::validate::Binding {
                 collection: Some(ex_collection_spec()),
                 resource_config_json: json!({"resource":"config"}).to_string(),
+                backfill: 1,
             }],
         }),
         apply: Some(capture::request::Apply {
@@ -444,6 +450,7 @@ fn ex_derive_request() -> derive::Request {
                 collection: Some(ex_collection_spec()),
                 lambda_config_json: json!({"lambda": "config"}).to_string(),
                 shuffle_lambda_config_json: json!({"shuffle": "config"}).to_string(),
+                backfill: 2,
             }],
             shuffle_key_types: vec![
                 flow::collection_spec::derivation::ShuffleType::Boolean as i32,
@@ -530,6 +537,7 @@ fn ex_materialize_request() -> materialize::Request {
                 collection: Some(ex_collection_spec()),
                 resource_config_json: json!({"resource":"config"}).to_string(),
                 field_config_json_map: ex_field_config(),
+                backfill: 3,
             }],
         }),
         apply: Some(materialize::request::Apply {
diff --git a/crates/proto-flow/tests/snapshots/regression__capture_request_json.snap b/crates/proto-flow/tests/snapshots/regression__capture_request_json.snap
index 3e04aea267..193f4ef7de 100644
--- a/crates/proto-flow/tests/snapshots/regression__capture_request_json.snap
+++ b/crates/proto-flow/tests/snapshots/regression__capture_request_json.snap
@@ -83,7 +83,8 @@ expression: json_test(msg)
             "flags": 4,
             "maxAppendRate": "4020303"
           }
-        }
+        },
+        "backfill": 1
       }
     ]
   },
@@ -164,7 +165,9 @@ expression: json_test(msg)
               "flags": 4,
               "maxAppendRate": "4020303"
             }
-          }
+          },
+          "backfill": 3,
+          "stateKey": "a%2Fcdc%2Ftable+baz.v3"
         }
       ],
       "intervalSeconds": 300,
@@ -292,7 +295,9 @@ expression: json_test(msg)
               "flags": 4,
               "maxAppendRate": "4020303"
             }
-          }
+          },
+          "backfill": 3,
+          "stateKey": "a%2Fcdc%2Ftable+baz.v3"
         }
       ],
       "intervalSeconds": 300,
diff --git a/crates/proto-flow/tests/snapshots/regression__capture_request_proto.snap b/crates/proto-flow/tests/snapshots/regression__capture_request_proto.snap
index 31180dd88e..d2c558723b 100644
--- a/crates/proto-flow/tests/snapshots/regression__capture_request_proto.snap
+++ b/crates/proto-flow/tests/snapshots/regression__capture_request_proto.snap
@@ -5,10 +5,10 @@ expression: proto_test(msg)
 |0a150807 12117b22 73706563 223a2263| ......{"spec":"c 00000000
 |6f6e6669 67227d12 19080712 157b2264| onfig"}......{"d 00000010
 |6973636f 76657222 3a22636f 6e666967| iscover":"config 00000020
-|227d1ac6 030a1076 616c6964 6174652f| "}.....validate/ 00000030
+|227d1ac8 030a1076 616c6964 6174652f| "}.....validate/ 00000030
 |63617074 75726510 071a157b 2276616c| capture....{"val 00000040
 |69646174 65223a22 636f6e66 6967227d| idate":"config"} 00000050
-|2298030a 157b2272 65736f75 72636522| "....{"resource" 00000060
+|229a030a 157b2272 65736f75 72636522| "....{"resource" 00000060
 |3a22636f 6e666967 227d12fe 020a1161| :"config"}.....a 00000070
 |636d6543 6f2f636f 6c6c6563 74696f6e| cmeCo/collection 00000080
 |1a082f6b 65792f6f 6e651a08 2f6b6579| ../key/one../key 00000090
@@ -33,96 +33,100 @@ expression: proto_test(msg)
 |083e1080 e59a773a 18506174 687b7b50| .>....w:.Path{{P 000001c0
 |6f737466 69782e54 656d706c 6174657d| ostfix.Template} 000001d0
 |7d300438 cfb0f501 5a117b22 72656164| }0.8....Z.{"read 000001e0
-|223a2273 6368656d 61227d22 b7050aa7| ":"schema"}".... 000001f0
-|050a0e61 636d6543 6f2f6361 70747572| ...acmeCo/captur 00000200
-|6510071a 197b2263 61707475 7265223a| e....{"capture": 00000210
-|7b22636f 6e666967 223a3432 7d7d22a4| {"config":42}}". 00000220
-|030a157b 22726573 6f757263 65223a22| ...{"resource":" 00000230
-|636f6e66 6967227d 1204736f 6d651204| config"}..some.. 00000240
-|70617468 1afe020a 1161636d 65436f2f| path.....acmeCo/ 00000250
-|636f6c6c 65637469 6f6e1a08 2f6b6579| collection../key 00000260
-|2f6f6e65 1a082f6b 65792f74 776f220b| /one../key/two". 00000270
-|2f5f6d65 74612f75 7569642a 04747970| /_meta/uuid*.typ 00000280
-|652a0672 6567696f 6e325d0a 092f6a73| e*.region2]../js 00000290
-|6f6e2f70 74721207 612d6669 656c6420| on/ptr..a-field  000002a0
-|0132450a 07696e74 65676572 0a067374| .2E..integer..st 000002b0
-|72696e67 1a131a03 74797022 04646174| ring....typ".dat 000002c0
-|6530b960 3a03656e 63220574 69746c65| e0.`:.enc".title 000002d0
-|2a046465 7363320e 7b226465 66223a22| *.desc2.{"def":" 000002e0
-|61756c74 227d4001 3a0e7b22 61636b22| ault"}@.:.{"ack" 000002f0
-|3a227472 7565227d 42127b22 77726974| :"true"}B.{"writ 00000300
-|65223a22 73636865 6d61227d 4aa3010a| e":"schema"}J... 00000310
-|12706172 74697469 6f6e2f74 656d706c| .partition/templ 00000320
-|61746510 031a400a 1e0a0f65 73747561| ate...@....estua 00000330
-|72792e64 65762f66 6f6f120b 6c616265| ry.dev/foo..labe 00000340
-|6c2d7661 6c75650a 1e0a0f65 73747561| l-value....estua 00000350
-|72792e64 65762f62 6172120b 6f746865| ry.dev/bar..othe 00000360
-|722d7661 6c756522 4208e9ec 0610031a| r-value"B....... 00000370
-|1273333a 2f2f6275 636b6574 2f707265| .s3://bucket/pre 00000380
-|66697822 0308ac02 3207083e 1080e59a| fix"....2..>.... 00000390
-|773a1850 6174687b 7b506f73 74666978| w:.Path{{Postfix 000003a0
-|2e54656d 706c6174 657d7d30 0438cfb0| .Template}}0.8.. 000003b0
-|f5015a11 7b227265 6164223a 22736368| ..Z.{"read":"sch 000003c0
-|656d6122 7d28ac02 3280010a 0e736861| ema"}(..2....sha 000003d0
-|72642f74 656d706c 6174651a 0f726563| rd/template..rec 000003e0
-|6f766572 792f7072 65666978 220b6869| overy/prefix".hi 000003f0
-|6e742f70 72656669 78280332 02083c48| nt/prefix(.2..<H 00000400
-|0152400a 1e0a0f65 73747561 72792e64| .R@....estuary.d 00000410
-|65762f66 6f6f120b 6c616265 6c2d7661| ev/foo..label-va 00000420
-|6c75650a 1e0a0f65 73747561 72792e64| lue....estuary.d 00000430
-|65762f62 6172120b 6f746865 722d7661| ev/bar..other-va 00000440
-|6c756560 8cdc0268 e9ec063a 380a1172| lue`...h...:8..r 00000450
-|65636f76 6572792f 74656d70 6c617465| ecovery/template 00000460
-|10032221 08808040 10041a14 73333a2f| .."!...@....s3:/ 00000470
-|2f627563 6b65742f 7265636f 76657279| /bucket/recovery 00000480
-|220308ac 02420c08 903f1205 68747470| "....B...?..http 00000490
-|73180142 0308a846 120b3131 3a32323a| s..B...F..11:22: 000004a0
-|33333a34 342ae905 0aa7050a 0e61636d| 33:44*.......acm 000004b0
-|65436f2f 63617074 75726510 071a197b| eCo/capture....{ 000004c0
-|22636170 74757265 223a7b22 636f6e66| "capture":{"conf 000004d0
-|6967223a 34327d7d 22a4030a 157b2272| ig":42}}"....{"r 000004e0
-|65736f75 72636522 3a22636f 6e666967| esource":"config 000004f0
-|227d1204 736f6d65 12047061 74681afe| "}..some..path.. 00000500
-|020a1161 636d6543 6f2f636f 6c6c6563| ...acmeCo/collec 00000510
-|74696f6e 1a082f6b 65792f6f 6e651a08| tion../key/one.. 00000520
-|2f6b6579 2f74776f 220b2f5f 6d657461| /key/two"./_meta 00000530
-|2f757569 642a0474 7970652a 06726567| /uuid*.type*.reg 00000540
-|696f6e32 5d0a092f 6a736f6e 2f707472| ion2]../json/ptr 00000550
-|1207612d 6669656c 64200132 450a0769| ..a-field .2E..i 00000560
-|6e746567 65720a06 73747269 6e671a13| nteger..string.. 00000570
-|1a037479 70220464 61746530 b9603a03| ..typ".date0.`:. 00000580
-|656e6322 05746974 6c652a04 64657363| enc".title*.desc 00000590
-|320e7b22 64656622 3a226175 6c74227d| 2.{"def":"ault"} 000005a0
-|40013a0e 7b226163 6b223a22 74727565| @.:.{"ack":"true 000005b0
-|227d4212 7b227772 69746522 3a227363| "}B.{"write":"sc 000005c0
-|68656d61 227d4aa3 010a1270 61727469| hema"}J....parti 000005d0
-|74696f6e 2f74656d 706c6174 6510031a| tion/template... 000005e0
-|400a1e0a 0f657374 75617279 2e646576| @....estuary.dev 000005f0
-|2f666f6f 120b6c61 62656c2d 76616c75| /foo..label-valu 00000600
-|650a1e0a 0f657374 75617279 2e646576| e....estuary.dev 00000610
-|2f626172 120b6f74 6865722d 76616c75| /bar..other-valu 00000620
-|65224208 e9ec0610 031a1273 333a2f2f| e"B........s3:// 00000630
-|6275636b 65742f70 72656669 78220308| bucket/prefix".. 00000640
-|ac023207 083e1080 e59a773a 18506174| ..2..>....w:.Pat 00000650
-|687b7b50 6f737466 69782e54 656d706c| h{{Postfix.Templ 00000660
-|6174657d 7d300438 cfb0f501 5a117b22| ate}}0.8....Z.{" 00000670
-|72656164 223a2273 6368656d 61227d28| read":"schema"}( 00000680
-|ac023280 010a0e73 68617264 2f74656d| ..2....shard/tem 00000690
-|706c6174 651a0f72 65636f76 6572792f| plate..recovery/ 000006a0
-|70726566 6978220b 68696e74 2f707265| prefix".hint/pre 000006b0
-|66697828 03320208 3c480152 400a1e0a| fix(.2..<H.R@... 000006c0
-|0f657374 75617279 2e646576 2f666f6f| .estuary.dev/foo 000006d0
-|120b6c61 62656c2d 76616c75 650a1e0a| ..label-value... 000006e0
-|0f657374 75617279 2e646576 2f626172| .estuary.dev/bar 000006f0
-|120b6f74 6865722d 76616c75 65608cdc| ..other-value`.. 00000700
-|0268e9ec 063a380a 11726563 6f766572| .h...:8..recover 00000710
-|792f7465 6d706c61 74651003 22210880| y/template.."!.. 00000720
-|80401004 1a147333 3a2f2f62 75636b65| .@....s3://bucke 00000730
-|742f7265 636f7665 72792203 08ac0242| t/recovery"....B 00000740
-|0c08903f 12056874 74707318 01420308| ...?..https..B.. 00000750
-|a846120b 31313a32 323a3333 3a34341a| .F..11:22:33:44. 00000760
-|14153322 11001d77 66554425 bbaa9988| ..3"...wfUD%.... 00000770
-|2dffeedd cc221a7b 22636f6e 6e656374| -....".{"connect 00000780
-|6f72223a 7b227374 61746522 3a34327d| or":{"state":42} 00000790
-|7d320208 20a20606 12024869 1801|     }2.. .....Hi..   000007a0
-                                                       000007ae
+|223a2273 6368656d 61227d18 0122d105| ":"schema"}..".. 000001f0
+|0ac1050a 0e61636d 65436f2f 63617074| .....acmeCo/capt 00000200
+|75726510 071a197b 22636170 74757265| ure....{"capture 00000210
+|223a7b22 636f6e66 6967223a 34327d7d| ":{"config":42}} 00000220
+|22be030a 157b2272 65736f75 72636522| "....{"resource" 00000230
+|3a22636f 6e666967 227d1204 736f6d65| :"config"}..some 00000240
+|12047061 74681afe 020a1161 636d6543| ..path.....acmeC 00000250
+|6f2f636f 6c6c6563 74696f6e 1a082f6b| o/collection../k 00000260
+|65792f6f 6e651a08 2f6b6579 2f74776f| ey/one../key/two 00000270
+|220b2f5f 6d657461 2f757569 642a0474| "./_meta/uuid*.t 00000280
+|7970652a 06726567 696f6e32 5d0a092f| ype*.region2]../ 00000290
+|6a736f6e 2f707472 1207612d 6669656c| json/ptr..a-fiel 000002a0
+|64200132 450a0769 6e746567 65720a06| d .2E..integer.. 000002b0
+|73747269 6e671a13 1a037479 70220464| string....typ".d 000002c0
+|61746530 b9603a03 656e6322 05746974| ate0.`:.enc".tit 000002d0
+|6c652a04 64657363 320e7b22 64656622| le*.desc2.{"def" 000002e0
+|3a226175 6c74227d 40013a0e 7b226163| :"ault"}@.:.{"ac 000002f0
+|6b223a22 74727565 227d4212 7b227772| k":"true"}B.{"wr 00000300
+|69746522 3a227363 68656d61 227d4aa3| ite":"schema"}J. 00000310
+|010a1270 61727469 74696f6e 2f74656d| ...partition/tem 00000320
+|706c6174 6510031a 400a1e0a 0f657374| plate...@....est 00000330
+|75617279 2e646576 2f666f6f 120b6c61| uary.dev/foo..la 00000340
+|62656c2d 76616c75 650a1e0a 0f657374| bel-value....est 00000350
+|75617279 2e646576 2f626172 120b6f74| uary.dev/bar..ot 00000360
+|6865722d 76616c75 65224208 e9ec0610| her-value"B..... 00000370
+|031a1273 333a2f2f 6275636b 65742f70| ...s3://bucket/p 00000380
+|72656669 78220308 ac023207 083e1080| refix"....2..>.. 00000390
+|e59a773a 18506174 687b7b50 6f737466| ..w:.Path{{Postf 000003a0
+|69782e54 656d706c 6174657d 7d300438| ix.Template}}0.8 000003b0
+|cfb0f501 5a117b22 72656164 223a2273| ....Z.{"read":"s 000003c0
+|6368656d 61227d20 032a1661 25324663| chema"} .*.a%2Fc 000003d0
+|64632532 46746162 6c652b62 617a2e76| dc%2Ftable+baz.v 000003e0
+|3328ac02 3280010a 0e736861 72642f74| 3(..2....shard/t 000003f0
+|656d706c 6174651a 0f726563 6f766572| emplate..recover 00000400
+|792f7072 65666978 220b6869 6e742f70| y/prefix".hint/p 00000410
+|72656669 78280332 02083c48 0152400a| refix(.2..<H.R@. 00000420
+|1e0a0f65 73747561 72792e64 65762f66| ...estuary.dev/f 00000430
+|6f6f120b 6c616265 6c2d7661 6c75650a| oo..label-value. 00000440
+|1e0a0f65 73747561 72792e64 65762f62| ...estuary.dev/b 00000450
+|6172120b 6f746865 722d7661 6c756560| ar..other-value` 00000460
+|8cdc0268 e9ec063a 380a1172 65636f76| ...h...:8..recov 00000470
+|6572792f 74656d70 6c617465 10032221| ery/template.."! 00000480
+|08808040 10041a14 73333a2f 2f627563| ...@....s3://buc 00000490
+|6b65742f 7265636f 76657279 220308ac| ket/recovery"... 000004a0
+|02420c08 903f1205 68747470 73180142| .B...?..https..B 000004b0
+|0308a846 120b3131 3a32323a 33333a34| ...F..11:22:33:4 000004c0
+|342a8306 0ac1050a 0e61636d 65436f2f| 4*.......acmeCo/ 000004d0
+|63617074 75726510 071a197b 22636170| capture....{"cap 000004e0
+|74757265 223a7b22 636f6e66 6967223a| ture":{"config": 000004f0
+|34327d7d 22be030a 157b2272 65736f75| 42}}"....{"resou 00000500
+|72636522 3a22636f 6e666967 227d1204| rce":"config"}.. 00000510
+|736f6d65 12047061 74681afe 020a1161| some..path.....a 00000520
+|636d6543 6f2f636f 6c6c6563 74696f6e| cmeCo/collection 00000530
+|1a082f6b 65792f6f 6e651a08 2f6b6579| ../key/one../key 00000540
+|2f74776f 220b2f5f 6d657461 2f757569| /two"./_meta/uui 00000550
+|642a0474 7970652a 06726567 696f6e32| d*.type*.region2 00000560
+|5d0a092f 6a736f6e 2f707472 1207612d| ]../json/ptr..a- 00000570
+|6669656c 64200132 450a0769 6e746567| field .2E..integ 00000580
+|65720a06 73747269 6e671a13 1a037479| er..string....ty 00000590
+|70220464 61746530 b9603a03 656e6322| p".date0.`:.enc" 000005a0
+|05746974 6c652a04 64657363 320e7b22| .title*.desc2.{" 000005b0
+|64656622 3a226175 6c74227d 40013a0e| def":"ault"}@.:. 000005c0
+|7b226163 6b223a22 74727565 227d4212| {"ack":"true"}B. 000005d0
+|7b227772 69746522 3a227363 68656d61| {"write":"schema 000005e0
+|227d4aa3 010a1270 61727469 74696f6e| "}J....partition 000005f0
+|2f74656d 706c6174 6510031a 400a1e0a| /template...@... 00000600
+|0f657374 75617279 2e646576 2f666f6f| .estuary.dev/foo 00000610
+|120b6c61 62656c2d 76616c75 650a1e0a| ..label-value... 00000620
+|0f657374 75617279 2e646576 2f626172| .estuary.dev/bar 00000630
+|120b6f74 6865722d 76616c75 65224208| ..other-value"B. 00000640
+|e9ec0610 031a1273 333a2f2f 6275636b| .......s3://buck 00000650
+|65742f70 72656669 78220308 ac023207| et/prefix"....2. 00000660
+|083e1080 e59a773a 18506174 687b7b50| .>....w:.Path{{P 00000670
+|6f737466 69782e54 656d706c 6174657d| ostfix.Template} 00000680
+|7d300438 cfb0f501 5a117b22 72656164| }0.8....Z.{"read 00000690
+|223a2273 6368656d 61227d20 032a1661| ":"schema"} .*.a 000006a0
+|25324663 64632532 46746162 6c652b62| %2Fcdc%2Ftable+b 000006b0
+|617a2e76 3328ac02 3280010a 0e736861| az.v3(..2....sha 000006c0
+|72642f74 656d706c 6174651a 0f726563| rd/template..rec 000006d0
+|6f766572 792f7072 65666978 220b6869| overy/prefix".hi 000006e0
+|6e742f70 72656669 78280332 02083c48| nt/prefix(.2..<H 000006f0
+|0152400a 1e0a0f65 73747561 72792e64| .R@....estuary.d 00000700
+|65762f66 6f6f120b 6c616265 6c2d7661| ev/foo..label-va 00000710
+|6c75650a 1e0a0f65 73747561 72792e64| lue....estuary.d 00000720
+|65762f62 6172120b 6f746865 722d7661| ev/bar..other-va 00000730
+|6c756560 8cdc0268 e9ec063a 380a1172| lue`...h...:8..r 00000740
+|65636f76 6572792f 74656d70 6c617465| ecovery/template 00000750
+|10032221 08808040 10041a14 73333a2f| .."!...@....s3:/ 00000760
+|2f627563 6b65742f 7265636f 76657279| /bucket/recovery 00000770
+|220308ac 02420c08 903f1205 68747470| "....B...?..http 00000780
+|73180142 0308a846 120b3131 3a32323a| s..B...F..11:22: 00000790
+|33333a34 341a1415 33221100 1d776655| 33:44...3"...wfU 000007a0
+|4425bbaa 99882dff eeddcc22 1a7b2263| D%....-....".{"c 000007b0
+|6f6e6e65 63746f72 223a7b22 73746174| onnector":{"stat 000007c0
+|65223a34 327d7d32 020820a2 06061202| e":42}}2.. ..... 000007d0
+|48691801|                            Hi..             000007e0
+                                                       000007e4
diff --git a/crates/proto-flow/tests/snapshots/regression__capture_spec_json.snap b/crates/proto-flow/tests/snapshots/regression__capture_spec_json.snap
index a6ec85010a..8792e73573 100644
--- a/crates/proto-flow/tests/snapshots/regression__capture_spec_json.snap
+++ b/crates/proto-flow/tests/snapshots/regression__capture_spec_json.snap
@@ -78,7 +78,9 @@ expression: json_test(msg)
           "flags": 4,
           "maxAppendRate": "4020303"
         }
-      }
+      },
+      "backfill": 3,
+      "stateKey": "a%2Fcdc%2Ftable+baz.v3"
     }
   ],
   "intervalSeconds": 300,
diff --git a/crates/proto-flow/tests/snapshots/regression__capture_spec_proto.snap b/crates/proto-flow/tests/snapshots/regression__capture_spec_proto.snap
index bcfa0b4521..63f4406edb 100644
--- a/crates/proto-flow/tests/snapshots/regression__capture_spec_proto.snap
+++ b/crates/proto-flow/tests/snapshots/regression__capture_spec_proto.snap
@@ -4,7 +4,7 @@ expression: proto_test(msg)
 ---
 |0a0e6163 6d65436f 2f636170 74757265| ..acmeCo/capture 00000000
 |10071a19 7b226361 70747572 65223a7b| ....{"capture":{ 00000010
-|22636f6e 66696722 3a34327d 7d22a403| "config":42}}".. 00000020
+|22636f6e 66696722 3a34327d 7d22be03| "config":42}}".. 00000020
 |0a157b22 7265736f 75726365 223a2263| ..{"resource":"c 00000030
 |6f6e6669 67227d12 04736f6d 65120470| onfig"}..some..p 00000040
 |6174681a fe020a11 61636d65 436f2f63| ath.....acmeCo/c 00000050
@@ -31,18 +31,20 @@ expression: proto_test(msg)
 |3a185061 74687b7b 506f7374 6669782e| :.Path{{Postfix. 000001a0
 |54656d70 6c617465 7d7d3004 38cfb0f5| Template}}0.8... 000001b0
 |015a117b 22726561 64223a22 73636865| .Z.{"read":"sche 000001c0
-|6d61227d 28ac0232 80010a0e 73686172| ma"}(..2....shar 000001d0
-|642f7465 6d706c61 74651a0f 7265636f| d/template..reco 000001e0
-|76657279 2f707265 66697822 0b68696e| very/prefix".hin 000001f0
-|742f7072 65666978 28033202 083c4801| t/prefix(.2..<H. 00000200
-|52400a1e 0a0f6573 74756172 792e6465| R@....estuary.de 00000210
-|762f666f 6f120b6c 6162656c 2d76616c| v/foo..label-val 00000220
-|75650a1e 0a0f6573 74756172 792e6465| ue....estuary.de 00000230
-|762f6261 72120b6f 74686572 2d76616c| v/bar..other-val 00000240
-|7565608c dc0268e9 ec063a38 0a117265| ue`...h...:8..re 00000250
-|636f7665 72792f74 656d706c 61746510| covery/template. 00000260
-|03222108 80804010 041a1473 333a2f2f| ."!...@....s3:// 00000270
-|6275636b 65742f72 65636f76 65727922| bucket/recovery" 00000280
-|0308ac02 420c0890 3f120568 74747073| ....B...?..https 00000290
-|18014203 08a846|                     ..B...F          000002a0
-                                                       000002a7
+|6d61227d 20032a16 61253246 63646325| ma"} .*.a%2Fcdc% 000001d0
+|32467461 626c652b 62617a2e 763328ac| 2Ftable+baz.v3(. 000001e0
+|02328001 0a0e7368 6172642f 74656d70| .2....shard/temp 000001f0
+|6c617465 1a0f7265 636f7665 72792f70| late..recovery/p 00000200
+|72656669 78220b68 696e742f 70726566| refix".hint/pref 00000210
+|69782803 3202083c 48015240 0a1e0a0f| ix(.2..<H.R@.... 00000220
+|65737475 6172792e 6465762f 666f6f12| estuary.dev/foo. 00000230
+|0b6c6162 656c2d76 616c7565 0a1e0a0f| .label-value.... 00000240
+|65737475 6172792e 6465762f 62617212| estuary.dev/bar. 00000250
+|0b6f7468 65722d76 616c7565 608cdc02| .other-value`... 00000260
+|68e9ec06 3a380a11 7265636f 76657279| h...:8..recovery 00000270
+|2f74656d 706c6174 65100322 21088080| /template.."!... 00000280
+|4010041a 1473333a 2f2f6275 636b6574| @....s3://bucket 00000290
+|2f726563 6f766572 79220308 ac02420c| /recovery"....B. 000002a0
+|08903f12 05687474 70731801 420308a8| ..?..https..B... 000002b0
+|46|                                  F                000002c0
+                                                       000002c1
diff --git a/crates/proto-flow/tests/snapshots/regression__derivation_spec_json.snap b/crates/proto-flow/tests/snapshots/regression__derivation_spec_json.snap
index dfeead0ce8..855cd4cdf1 100644
--- a/crates/proto-flow/tests/snapshots/regression__derivation_spec_json.snap
+++ b/crates/proto-flow/tests/snapshots/regression__derivation_spec_json.snap
@@ -162,9 +162,10 @@ expression: json_test(msg)
         "shuffleLambdaConfig": "SELECT $shuffle, $key;",
         "lambdaConfig": {"lambda":"config"},
         "readOnly": true,
-        "journalReadSuffix": "derive/a/collection/transform_name",
+        "journalReadSuffix": "derive/a/collection/transform_name.v2",
         "notBefore": "2023-08-11T03:00:27+00:00",
-        "notAfter": "2023-03-28T10:40:00+00:00"
+        "notAfter": "2023-03-28T10:40:00+00:00",
+        "backfill": 2
       }
     ],
     "shuffleKeyTypes": [
diff --git a/crates/proto-flow/tests/snapshots/regression__derivation_spec_proto.snap b/crates/proto-flow/tests/snapshots/regression__derivation_spec_proto.snap
index 8351610f0c..51ed59832a 100644
--- a/crates/proto-flow/tests/snapshots/regression__derivation_spec_proto.snap
+++ b/crates/proto-flow/tests/snapshots/regression__derivation_spec_proto.snap
@@ -25,10 +25,10 @@ expression: proto_test(msg)
 |02320708 3e1080e5 9a773a18 50617468| .2..>....w:.Path 00000140
 |7b7b506f 73746669 782e5465 6d706c61| {{Postfix.Templa 00000150
 |74657d7d 300438cf b0f5015a 117b2272| te}}0.8....Z.{"r 00000160
-|65616422 3a227363 68656d61 227d62c5| ead":"schema"}b. 00000170
+|65616422 3a227363 68656d61 227d62ca| ead":"schema"}b. 00000170
 |06080112 1c7b2264 65726976 6174696f| .....{"derivatio 00000180
 |6e223a7b 22636f6e 66696722 3a34327d| n":{"config":42} 00000190
-|7d1ace04 0a0e7472 616e7366 6f726d5f| }.....transform_ 000001a0
+|7d1ad304 0a0e7472 616e7366 6f726d5f| }.....transform_ 000001a0
 |6e616d65 12fe020a 1161636d 65436f2f| name.....acmeCo/ 000001b0
 |636f6c6c 65637469 6f6e1a08 2f6b6579| collection../key 000001c0
 |2f6f6e65 1a082f6b 65792f74 776f220b| /one../key/two". 000001d0
@@ -61,22 +61,22 @@ expression: proto_test(msg)
 |73687566 666c6532 042f6b65 793a1822| shuffle2./key:." 00000380
 |53454c45 43542024 73687566 666c652c| SELECT $shuffle, 00000390
 |20246b65 793b2242 137b226c 616d6264|  $key;"B.{"lambd 000003a0
-|61223a22 636f6e66 6967227d 48015222| a":"config"}H.R" 000003b0
+|61223a22 636f6e66 6967227d 48015225| a":"config"}H.R% 000003b0
 |64657269 76652f61 2f636f6c 6c656374| derive/a/collect 000003c0
 |696f6e2f 7472616e 73666f72 6d5f6e61| ion/transform_na 000003d0
-|6d655a06 08cbc8d6 a6066206 0880888b| meZ.......b..... 000003e0
-|a1062202 03022a80 010a0e73 68617264| .."...*....shard 000003f0
-|2f74656d 706c6174 651a0f72 65636f76| /template..recov 00000400
-|6572792f 70726566 6978220b 68696e74| ery/prefix".hint 00000410
-|2f707265 66697828 03320208 3c480152| /prefix(.2..<H.R 00000420
-|400a1e0a 0f657374 75617279 2e646576| @....estuary.dev 00000430
-|2f666f6f 120b6c61 62656c2d 76616c75| /foo..label-valu 00000440
-|650a1e0a 0f657374 75617279 2e646576| e....estuary.dev 00000450
-|2f626172 120b6f74 6865722d 76616c75| /bar..other-valu 00000460
-|65608cdc 0268e9ec 0632380a 11726563| e`...h...28..rec 00000470
-|6f766572 792f7465 6d706c61 74651003| overy/template.. 00000480
-|22210880 80401004 1a147333 3a2f2f62| "!...@....s3://b 00000490
-|75636b65 742f7265 636f7665 72792203| ucket/recovery". 000004a0
-|08ac023a 0c08903f 12056874 74707318| ...:...?..https. 000004b0
-|013a0308 a846|                       .:...F           000004c0
-                                                       000004c6
+|6d652e76 325a0608 cbc8d6a6 06620608| me.v2Z.......b.. 000003e0
+|80888ba1 06680222 0203022a 80010a0e| .....h."...*.... 000003f0
+|73686172 642f7465 6d706c61 74651a0f| shard/template.. 00000400
+|7265636f 76657279 2f707265 66697822| recovery/prefix" 00000410
+|0b68696e 742f7072 65666978 28033202| .hint/prefix(.2. 00000420
+|083c4801 52400a1e 0a0f6573 74756172| .<H.R@....estuar 00000430
+|792e6465 762f666f 6f120b6c 6162656c| y.dev/foo..label 00000440
+|2d76616c 75650a1e 0a0f6573 74756172| -value....estuar 00000450
+|792e6465 762f6261 72120b6f 74686572| y.dev/bar..other 00000460
+|2d76616c 7565608c dc0268e9 ec063238| -value`...h...28 00000470
+|0a117265 636f7665 72792f74 656d706c| ..recovery/templ 00000480
+|61746510 03222108 80804010 041a1473| ate.."!...@....s 00000490
+|333a2f2f 6275636b 65742f72 65636f76| 3://bucket/recov 000004a0
+|65727922 0308ac02 3a0c0890 3f120568| ery"....:...?..h 000004b0
+|74747073 18013a03 08a846|            ttps..:...F      000004c0
+                                                       000004cb
diff --git a/crates/proto-flow/tests/snapshots/regression__derive_request_json.snap b/crates/proto-flow/tests/snapshots/regression__derive_request_json.snap
index dff8e9c22f..0b4dc61751 100644
--- a/crates/proto-flow/tests/snapshots/regression__derive_request_json.snap
+++ b/crates/proto-flow/tests/snapshots/regression__derive_request_json.snap
@@ -146,7 +146,8 @@ expression: json_test(msg)
           }
         },
         "shuffleLambdaConfig": {"shuffle":"config"},
-        "lambdaConfig": {"lambda":"config"}
+        "lambdaConfig": {"lambda":"config"},
+        "backfill": 2
       }
     ],
     "shuffleKeyTypes": [
diff --git a/crates/proto-flow/tests/snapshots/regression__derive_request_proto.snap b/crates/proto-flow/tests/snapshots/regression__derive_request_proto.snap
index a37e353004..c021fdc8c4 100644
--- a/crates/proto-flow/tests/snapshots/regression__derive_request_proto.snap
+++ b/crates/proto-flow/tests/snapshots/regression__derive_request_proto.snap
@@ -3,7 +3,7 @@ source: crates/proto-flow/tests/regression.rs
 expression: proto_test(msg)
 ---
 |0a150801 12117b22 73706563 223a2263| ......{"spec":"c 00000000
-|6f6e6669 67227d12 a4070801 12157b22| onfig"}.......{" 00000010
+|6f6e6669 67227d12 a6070801 12157b22| onfig"}.......{" 00000010
 |76616c69 64617465 223a2263 6f6e6669| validate":"confi 00000020
 |67227d1a fe020a11 61636d65 436f2f63| g"}.....acmeCo/c 00000030
 |6f6c6c65 6374696f 6e1a082f 6b65792f| ollection../key/ 00000040
@@ -29,7 +29,7 @@ expression: proto_test(msg)
 |3a185061 74687b7b 506f7374 6669782e| :.Path{{Postfix. 00000180
 |54656d70 6c617465 7d7d3004 38cfb0f5| Template}}0.8... 00000190
 |015a117b 22726561 64223a22 73636865| .Z.{"read":"sche 000001a0
-|6d61227d 22b9030a 0b737461 626c655f| ma"}"....stable_ 000001b0
+|6d61227d 22bb030a 0b737461 626c655f| ma"}"....stable_ 000001b0
 |6e616d65 12fe020a 1161636d 65436f2f| name.....acmeCo/ 000001c0
 |636f6c6c 65637469 6f6e1a08 2f6b6579| collection../key 000001d0
 |2f6f6e65 1a082f6b 65792f74 776f220b| /one../key/two". 000001e0
@@ -57,49 +57,49 @@ expression: proto_test(msg)
 |656d6122 7d1a147b 22736875 66666c65| ema"}..{"shuffle 00000340
 |223a2263 6f6e6669 67227d22 137b226c| ":"config"}".{"l 00000350
 |616d6264 61223a22 636f6e66 6967227d| ambda":"config"} 00000360
-|2a020102 32146669 6c653a2f 2f2f7072| *...2.file:///pr 00000370
-|6f6a6563 742f726f 6f743a32 0a182f75| oject/root:2../u 00000380
-|73696e67 2f747970 65736372 6970742f| sing/typescript/ 00000390
-|6d6f6475 6c651216 66696c65 3a2f2f2f| module..file:/// 000003a0
-|70617468 2f746f2f 696d706f 72741ac0| path/to/import.. 000003b0
-|030afe02 0a116163 6d65436f 2f636f6c| ......acmeCo/col 000003c0
-|6c656374 696f6e1a 082f6b65 792f6f6e| lection../key/on 000003d0
-|651a082f 6b65792f 74776f22 0b2f5f6d| e../key/two"./_m 000003e0
-|6574612f 75756964 2a047479 70652a06| eta/uuid*.type*. 000003f0
-|72656769 6f6e325d 0a092f6a 736f6e2f| region2]../json/ 00000400
-|70747212 07612d66 69656c64 20013245| ptr..a-field .2E 00000410
-|0a07696e 74656765 720a0673 7472696e| ..integer..strin 00000420
-|671a131a 03747970 22046461 746530b9| g....typ".date0. 00000430
-|603a0365 6e632205 7469746c 652a0464| `:.enc".title*.d 00000440
-|65736332 0e7b2264 6566223a 2261756c| esc2.{"def":"aul 00000450
-|74227d40 013a0e7b 2261636b 223a2274| t"}@.:.{"ack":"t 00000460
-|72756522 7d42127b 22777269 7465223a| rue"}B.{"write": 00000470
-|22736368 656d6122 7d4aa301 0a127061| "schema"}J....pa 00000480
-|72746974 696f6e2f 74656d70 6c617465| rtition/template 00000490
-|10031a40 0a1e0a0f 65737475 6172792e| ...@....estuary. 000004a0
-|6465762f 666f6f12 0b6c6162 656c2d76| dev/foo..label-v 000004b0
-|616c7565 0a1e0a0f 65737475 6172792e| alue....estuary. 000004c0
-|6465762f 62617212 0b6f7468 65722d76| dev/bar..other-v 000004d0
-|616c7565 224208e9 ec061003 1a127333| alue"B........s3 000004e0
-|3a2f2f62 75636b65 742f7072 65666978| ://bucket/prefix 000004f0
-|220308ac 02320708 3e1080e5 9a773a18| "....2..>....w:. 00000500
-|50617468 7b7b506f 73746669 782e5465| Path{{Postfix.Te 00000510
-|6d706c61 74657d7d 300438cf b0f5015a| mplate}}0.8....Z 00000520
-|117b2272 65616422 3a227363 68656d61| .{"read":"schema 00000530
-|227d120b 31313a32 323a3333 3a34341a| "}..11:22:33:44. 00000540
-|14153322 11001d77 66554425 bbaa9988| ..3"...wfUD%.... 00000550
-|2dffeedd cc2a1a7b 22636f6e 6e656374| -....*.{"connect 00000560
-|6f72223a 7b227374 61746522 3a34327d| or":{"state":42} 00000570
-|7d223e08 02121209 d2040000 00000000| }">............. 00000580
-|112e1600 00000000 001a160a 095b7472| .............[tr 00000590
-|75652c33 325d1204 564b1e09 1885c39f| ue,32]..VK...... 000005a0
-|15220e7b 22726561 64223a22 646f6322| .".{"read":"doc" 000005b0
-|7d2a0032 660a640a 4a0a1561 2f726561| }*.2f.d.J..a/rea 000005c0
-|642f6a6f 75726e61 6c3b7375 66666978| d/journal;suffix 000005d0
-|123108b9 6012150a 05030908 0507120c| .1..`........... 000005e0
-|09e32100 00000000 0010d708 12150a05| ..!............. 000005f0
-|070c662b 1d120c09 35010000 00000000| ..f+....5....... 00000600
-|10ae1112 160a0e61 6e2f6163 6b2f6a6f| .......an/ack/jo 00000610
-|75726e61 6c120403 0402053a 00a20606| urnal......:.... 00000620
-|12024869 1801|                       ..Hi..           00000630
-                                                       00000636
+|28022a02 01023214 66696c65 3a2f2f2f| (.*...2.file:/// 00000370
+|70726f6a 6563742f 726f6f74 3a320a18| project/root:2.. 00000380
+|2f757369 6e672f74 79706573 63726970| /using/typescrip 00000390
+|742f6d6f 64756c65 12166669 6c653a2f| t/module..file:/ 000003a0
+|2f2f7061 74682f74 6f2f696d 706f7274| //path/to/import 000003b0
+|1ac0030a fe020a11 61636d65 436f2f63| ........acmeCo/c 000003c0
+|6f6c6c65 6374696f 6e1a082f 6b65792f| ollection../key/ 000003d0
+|6f6e651a 082f6b65 792f7477 6f220b2f| one../key/two"./ 000003e0
+|5f6d6574 612f7575 69642a04 74797065| _meta/uuid*.type 000003f0
+|2a067265 67696f6e 325d0a09 2f6a736f| *.region2]../jso 00000400
+|6e2f7074 72120761 2d666965 6c642001| n/ptr..a-field . 00000410
+|32450a07 696e7465 6765720a 06737472| 2E..integer..str 00000420
+|696e671a 131a0374 79702204 64617465| ing....typ".date 00000430
+|30b9603a 03656e63 22057469 746c652a| 0.`:.enc".title* 00000440
+|04646573 63320e7b 22646566 223a2261| .desc2.{"def":"a 00000450
+|756c7422 7d40013a 0e7b2261 636b223a| ult"}@.:.{"ack": 00000460
+|22747275 65227d42 127b2277 72697465| "true"}B.{"write 00000470
+|223a2273 6368656d 61227d4a a3010a12| ":"schema"}J.... 00000480
+|70617274 6974696f 6e2f7465 6d706c61| partition/templa 00000490
+|74651003 1a400a1e 0a0f6573 74756172| te...@....estuar 000004a0
+|792e6465 762f666f 6f120b6c 6162656c| y.dev/foo..label 000004b0
+|2d76616c 75650a1e 0a0f6573 74756172| -value....estuar 000004c0
+|792e6465 762f6261 72120b6f 74686572| y.dev/bar..other 000004d0
+|2d76616c 75652242 08e9ec06 10031a12| -value"B........ 000004e0
+|73333a2f 2f627563 6b65742f 70726566| s3://bucket/pref 000004f0
+|69782203 08ac0232 07083e10 80e59a77| ix"....2..>....w 00000500
+|3a185061 74687b7b 506f7374 6669782e| :.Path{{Postfix. 00000510
+|54656d70 6c617465 7d7d3004 38cfb0f5| Template}}0.8... 00000520
+|015a117b 22726561 64223a22 73636865| .Z.{"read":"sche 00000530
+|6d61227d 120b3131 3a32323a 33333a34| ma"}..11:22:33:4 00000540
+|341a1415 33221100 1d776655 4425bbaa| 4...3"...wfUD%.. 00000550
+|99882dff eeddcc2a 1a7b2263 6f6e6e65| ..-....*.{"conne 00000560
+|63746f72 223a7b22 73746174 65223a34| ctor":{"state":4 00000570
+|327d7d22 3e080212 1209d204 00000000| 2}}">........... 00000580
+|0000112e 16000000 0000001a 160a095b| ...............[ 00000590
+|74727565 2c33325d 1204564b 1e091885| true,32]..VK.... 000005a0
+|c39f1522 0e7b2272 65616422 3a22646f| ...".{"read":"do 000005b0
+|63227d2a 0032660a 640a4a0a 15612f72| c"}*.2f.d.J..a/r 000005c0
+|6561642f 6a6f7572 6e616c3b 73756666| ead/journal;suff 000005d0
+|69781231 08b96012 150a0503 09080507| ix.1..`......... 000005e0
+|120c09e3 21000000 00000010 d7081215| ....!........... 000005f0
+|0a05070c 662b1d12 0c093501 00000000| ....f+....5..... 00000600
+|000010ae 1112160a 0e616e2f 61636b2f| .........an/ack/ 00000610
+|6a6f7572 6e616c12 04030402 053a00a2| journal......:.. 00000620
+|06061202 48691801|                   ....Hi..         00000630
+                                                       00000638
diff --git a/crates/proto-flow/tests/snapshots/regression__materialization_spec_json.snap b/crates/proto-flow/tests/snapshots/regression__materialization_spec_json.snap
index e8b94386b4..d9d9219f86 100644
--- a/crates/proto-flow/tests/snapshots/regression__materialization_spec_json.snap
+++ b/crates/proto-flow/tests/snapshots/regression__materialization_spec_json.snap
@@ -107,9 +107,11 @@ expression: json_test(msg)
           "other/field": 42.5
         }
       },
-      "journalReadSuffix": "materialize/acmeCo/materialization/some%20path",
+      "journalReadSuffix": "materialize/acmeCo/materialization/some%20path.v1",
       "notBefore": "2023-08-11T03:00:27+00:00",
-      "notAfter": "2023-03-28T10:40:00+00:00"
+      "notAfter": "2023-03-28T10:40:00+00:00",
+      "backfill": 1,
+      "stateKey": "some%20path.v1"
     }
   ],
   "shardTemplate": {
diff --git a/crates/proto-flow/tests/snapshots/regression__materialization_spec_proto.snap b/crates/proto-flow/tests/snapshots/regression__materialization_spec_proto.snap
index 049391563d..6360204b9b 100644
--- a/crates/proto-flow/tests/snapshots/regression__materialization_spec_proto.snap
+++ b/crates/proto-flow/tests/snapshots/regression__materialization_spec_proto.snap
@@ -5,7 +5,7 @@ expression: proto_test(msg)
 |0a166163 6d65436f 2f6d6174 65726961| ..acmeCo/materia 00000000
 |6c697a61 74696f6e 10081a1d 7b226d61| lization....{"ma 00000010
 |74657269 616c697a 65223a7b 22636f6e| terialize":{"con 00000020
-|66696722 3a34327d 7d228105 0a157b22| fig":42}}"....{" 00000030
+|66696722 3a34327d 7d229605 0a157b22| fig":42}}"....{" 00000030
 |7265736f 75726365 223a2263 6f6e6669| resource":"confi 00000040
 |67227d12 04736f6d 65120470 6174681a| g"}..some..path. 00000050
 |fe020a11 61636d65 436f2f63 6f6c6c65| ....acmeCo/colle 00000060
@@ -41,22 +41,24 @@ expression: proto_test(msg)
 |73747561 72792e64 65762f66 6f6f120b| stuary.dev/foo.. 00000240
 |6c616265 6c2d7661 6c75650a 1e0a0f65| label-value....e 00000250
 |73747561 72792e64 65762f62 6172120b| stuary.dev/bar.. 00000260
-|6f746865 722d7661 6c756542 2e6d6174| other-valueB.mat 00000270
+|6f746865 722d7661 6c756542 316d6174| other-valueB1mat 00000270
 |65726961 6c697a65 2f61636d 65436f2f| erialize/acmeCo/ 00000280
 |6d617465 7269616c 697a6174 696f6e2f| materialization/ 00000290
-|736f6d65 25323070 61746848 03520608| some%20pathH.R.. 000002a0
-|cbc8d6a6 065a0608 80888ba1 062a8001| .....Z.......*.. 000002b0
-|0a0e7368 6172642f 74656d70 6c617465| ..shard/template 000002c0
-|1a0f7265 636f7665 72792f70 72656669| ..recovery/prefi 000002d0
-|78220b68 696e742f 70726566 69782803| x".hint/prefix(. 000002e0
-|3202083c 48015240 0a1e0a0f 65737475| 2..<H.R@....estu 000002f0
-|6172792e 6465762f 666f6f12 0b6c6162| ary.dev/foo..lab 00000300
-|656c2d76 616c7565 0a1e0a0f 65737475| el-value....estu 00000310
-|6172792e 6465762f 62617212 0b6f7468| ary.dev/bar..oth 00000320
-|65722d76 616c7565 608cdc02 68e9ec06| er-value`...h... 00000330
-|32380a11 7265636f 76657279 2f74656d| 28..recovery/tem 00000340
-|706c6174 65100322 21088080 4010041a| plate.."!...@... 00000350
-|1473333a 2f2f6275 636b6574 2f726563| .s3://bucket/rec 00000360
-|6f766572 79220308 ac023a0c 08903f12| overy"....:...?. 00000370
-|05687474 70731801 3a0308a8 46|       .https..:...F    00000380
-                                                       0000038d
+|736f6d65 25323070 6174682e 76314803| some%20path.v1H. 000002a0
+|520608cb c8d6a606 5a060880 888ba106| R.......Z....... 000002b0
+|60016a0e 736f6d65 25323070 6174682e| `.j.some%20path. 000002c0
+|76312a80 010a0e73 68617264 2f74656d| v1*....shard/tem 000002d0
+|706c6174 651a0f72 65636f76 6572792f| plate..recovery/ 000002e0
+|70726566 6978220b 68696e74 2f707265| prefix".hint/pre 000002f0
+|66697828 03320208 3c480152 400a1e0a| fix(.2..<H.R@... 00000300
+|0f657374 75617279 2e646576 2f666f6f| .estuary.dev/foo 00000310
+|120b6c61 62656c2d 76616c75 650a1e0a| ..label-value... 00000320
+|0f657374 75617279 2e646576 2f626172| .estuary.dev/bar 00000330
+|120b6f74 6865722d 76616c75 65608cdc| ..other-value`.. 00000340
+|0268e9ec 0632380a 11726563 6f766572| .h...28..recover 00000350
+|792f7465 6d706c61 74651003 22210880| y/template.."!.. 00000360
+|80401004 1a147333 3a2f2f62 75636b65| .@....s3://bucke 00000370
+|742f7265 636f7665 72792203 08ac023a| t/recovery"....: 00000380
+|0c08903f 12056874 74707318 013a0308| ...?..https..:.. 00000390
+|a846|                                .F               000003a0
+                                                       000003a2
diff --git a/crates/proto-flow/tests/snapshots/regression__materialize_request_json.snap b/crates/proto-flow/tests/snapshots/regression__materialize_request_json.snap
index 665846ebf6..658dacbfc7 100644
--- a/crates/proto-flow/tests/snapshots/regression__materialize_request_json.snap
+++ b/crates/proto-flow/tests/snapshots/regression__materialize_request_json.snap
@@ -83,7 +83,8 @@ expression: json_test(msg)
         "fieldConfig": {
           "a_field": {"field":"config"},
           "other/field": 42.5
-        }
+        },
+        "backfill": 3
       }
     ]
   },
@@ -193,9 +194,11 @@ expression: json_test(msg)
               "other/field": 42.5
             }
           },
-          "journalReadSuffix": "materialize/acmeCo/materialization/some%20path",
+          "journalReadSuffix": "materialize/acmeCo/materialization/some%20path.v1",
           "notBefore": "2023-08-11T03:00:27+00:00",
-          "notAfter": "2023-03-28T10:40:00+00:00"
+          "notAfter": "2023-03-28T10:40:00+00:00",
+          "backfill": 1,
+          "stateKey": "some%20path.v1"
         }
       ],
       "shardTemplate": {
@@ -351,9 +354,11 @@ expression: json_test(msg)
               "other/field": 42.5
             }
           },
-          "journalReadSuffix": "materialize/acmeCo/materialization/some%20path",
+          "journalReadSuffix": "materialize/acmeCo/materialization/some%20path.v1",
           "notBefore": "2023-08-11T03:00:27+00:00",
-          "notAfter": "2023-03-28T10:40:00+00:00"
+          "notAfter": "2023-03-28T10:40:00+00:00",
+          "backfill": 1,
+          "stateKey": "some%20path.v1"
         }
       ],
       "shardTemplate": {
diff --git a/crates/proto-flow/tests/snapshots/regression__materialize_request_proto.snap b/crates/proto-flow/tests/snapshots/regression__materialize_request_proto.snap
index 054062ac58..908ac15909 100644
--- a/crates/proto-flow/tests/snapshots/regression__materialize_request_proto.snap
+++ b/crates/proto-flow/tests/snapshots/regression__materialize_request_proto.snap
@@ -3,10 +3,10 @@ source: crates/proto-flow/tests/regression.rs
 expression: proto_test(msg)
 ---
 |0a150808 12117b22 73706563 223a2263| ......{"spec":"c 00000000
-|6f6e6669 67227d12 82040a18 76616c69| onfig"}.....vali 00000010
+|6f6e6669 67227d12 84040a18 76616c69| onfig"}.....vali 00000010
 |64617465 2f6d6174 65726961 6c697a61| date/materializa 00000020
 |74696f6e 10081a15 7b227661 6c696461| tion....{"valida 00000030
-|7465223a 22636f6e 66696722 7d22cc03| te":"config"}".. 00000040
+|7465223a 22636f6e 66696722 7d22ce03| te":"config"}".. 00000040
 |0a157b22 7265736f 75726365 223a2263| ..{"resource":"c 00000050
 |6f6e6669 67227d12 fe020a11 61636d65| onfig"}.....acme 00000060
 |436f2f63 6f6c6c65 6374696f 6e1a082f| Co/collection../ 00000070
@@ -35,137 +35,140 @@ expression: proto_test(msg)
 |73636865 6d61227d 1a1d0a07 615f6669| schema"}....a_fi 000001e0
 |656c6412 127b2266 69656c64 223a2263| eld..{"field":"c 000001f0
 |6f6e6669 67227d1a 130a0b6f 74686572| onfig"}....other 00000200
-|2f666965 6c641204 34322e35 1a9d070a| /field..42.5.... 00000210
-|8d070a16 61636d65 436f2f6d 61746572| ....acmeCo/mater 00000220
-|69616c69 7a617469 6f6e1008 1a1d7b22| ialization....{" 00000230
-|6d617465 7269616c 697a6522 3a7b2263| materialize":{"c 00000240
-|6f6e6669 67223a34 327d7d22 81050a15| onfig":42}}".... 00000250
-|7b227265 736f7572 6365223a 22636f6e| {"resource":"con 00000260
-|66696722 7d120473 6f6d6512 04706174| fig"}..some..pat 00000270
-|681afe02 0a116163 6d65436f 2f636f6c| h.....acmeCo/col 00000280
-|6c656374 696f6e1a 082f6b65 792f6f6e| lection../key/on 00000290
-|651a082f 6b65792f 74776f22 0b2f5f6d| e../key/two"./_m 000002a0
-|6574612f 75756964 2a047479 70652a06| eta/uuid*.type*. 000002b0
-|72656769 6f6e325d 0a092f6a 736f6e2f| region2]../json/ 000002c0
-|70747212 07612d66 69656c64 20013245| ptr..a-field .2E 000002d0
-|0a07696e 74656765 720a0673 7472696e| ..integer..strin 000002e0
-|671a131a 03747970 22046461 746530b9| g....typ".date0. 000002f0
-|603a0365 6e632205 7469746c 652a0464| `:.enc".title*.d 00000300
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-|220308ac 02320708 3e1080e5 9a773a18| "....2..>....w:. 000003c0
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-|0608cbc8 d6a6065a 06088088 8ba1062a| .......Z.......* 000004d0
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-|041a1473 333a2f2f 6275636b 65742f72| ...s3://bucket/r 00000580
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-|3f120568 74747073 18013a03 08a84612| ?..https..:...F. 000005a0
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-|0608cbc8 d6a6065a 06088088 8ba1062a| .......Z.......* 00000870
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+|6c5d1a03 5a150022 125b332e 31343135| l]..Z..".[3.1415 000009e0
+|392c2266 69656c64 21225d2a 023c5b32| 9,"field!"]*.<[2 000009f0
+|137b2266 756c6c22 3a22646f 63756d65| .{"full":"docume 00000a00
+|6e74227d 38014266 0a640a4a 0a15612f| nt"}8.Bf.d.J..a/ 00000a10
+|72656164 2f6a6f75 726e616c 3b737566| read/journal;suf 00000a20
+|66697812 3108b960 12150a05 03090805| fix.1..`........ 00000a30
+|07120c09 e3210000 00000000 10d70812| .....!.......... 00000a40
+|150a0507 0c662b1d 120c0935 01000000| .....f+....5.... 00000a50
+|00000010 ae111216 0a0e616e 2f61636b| ..........an/ack 00000a60
+|2f6a6f75 726e616c 12040304 02054a00| /journal......J. 00000a70
+|a2060612 02486918 01|                .....Hi..        00000a80
+                                                       00000a89
diff --git a/crates/runtime/src/capture/task.rs b/crates/runtime/src/capture/task.rs
index 3485260040..519ffd9708 100644
--- a/crates/runtime/src/capture/task.rs
+++ b/crates/runtime/src/capture/task.rs
@@ -113,9 +113,11 @@ impl Binding {
         ser_policy: doc::SerPolicy,
     ) -> anyhow::Result<Self> {
         let flow::capture_spec::Binding {
+            backfill: _,
             collection,
             resource_config_json: _,
             resource_path,
+            state_key: _,
         } = spec;
 
         let flow::CollectionSpec {
diff --git a/crates/runtime/src/derive/task.rs b/crates/runtime/src/derive/task.rs
index ae2977130f..2c2f3bdfc0 100644
--- a/crates/runtime/src/derive/task.rs
+++ b/crates/runtime/src/derive/task.rs
@@ -103,6 +103,7 @@ impl Task {
 impl Transform {
     pub fn new(spec: &flow::collection_spec::derivation::Transform) -> anyhow::Result<Self> {
         let flow::collection_spec::derivation::Transform {
+            backfill: _,
             collection,
             journal_read_suffix: _,
             lambda_config_json: _,
diff --git a/crates/runtime/src/materialize/task.rs b/crates/runtime/src/materialize/task.rs
index 936653b5d6..c4a2de690b 100644
--- a/crates/runtime/src/materialize/task.rs
+++ b/crates/runtime/src/materialize/task.rs
@@ -85,6 +85,7 @@ impl Binding {
         ser_policy: &doc::SerPolicy,
     ) -> anyhow::Result<Self> {
         let flow::materialization_spec::Binding {
+            backfill: _,
             collection,
             delta_updates,
             deprecated_shuffle: _,
@@ -96,6 +97,7 @@ impl Binding {
             priority: _,
             resource_config_json: _,
             resource_path: _,
+            state_key: _,
         } = spec;
 
         let flow::FieldSelection {
diff --git a/crates/sources/src/scenarios/snapshots/sources__scenarios__test__derivations-2.snap b/crates/sources/src/scenarios/snapshots/sources__scenarios__test__derivations-2.snap
index afe9ae7c87..b0ed0b9613 100644
--- a/crates/sources/src/scenarios/snapshots/sources__scenarios__test__derivations-2.snap
+++ b/crates/sources/src/scenarios/snapshots/sources__scenarios__test__derivations-2.snap
@@ -79,7 +79,8 @@ Sources {
                     "name": "do-the-thing",
                     "source": "src/collection",
                     "shuffle": "any",
-                    "lambda": 42
+                    "lambda": 42,
+                    "backfill": 2
                   }
                 ],
                 "shards": {
diff --git a/crates/sources/src/scenarios/snapshots/sources__scenarios__test__derivations-3.snap b/crates/sources/src/scenarios/snapshots/sources__scenarios__test__derivations-3.snap
index ed7fd662a9..4b055ad04d 100644
--- a/crates/sources/src/scenarios/snapshots/sources__scenarios__test__derivations-3.snap
+++ b/crates/sources/src/scenarios/snapshots/sources__scenarios__test__derivations-3.snap
@@ -79,7 +79,8 @@ Sources {
                     "name": "do-the-thing",
                     "source": "src/collection",
                     "shuffle": "any",
-                    "lambda": 42
+                    "lambda": 42,
+                    "backfill": 2
                   }
                 ],
                 "shards": {
@@ -197,7 +198,7 @@ Sources {
             resource: test://example/catalog.yaml,
             content_type: "CATALOG",
             content: ".. binary ..",
-            content_dom: {"collections":{"d1/collection":{"schema":"collection.schema.yaml","key":["/d1-key"],"derive":{"using":{"typescript":{"module":"collection.ts"}},"transforms":[{"name":"some-name","source":{"name":"src/collection","partitions":{"include":{"a_field":["foo",42]},"exclude":{"other_field":[false]}},"notBefore":"2017-03-03T03:02:01Z","notAfter":"2019-03-06T09:30:02Z"},"shuffle":{"key":["/shuffle","/key"]},"priority":32,"readDelay":"1h"}]}},"d2/collection":{"schema":"collection.schema.yaml","key":["/d2-key"],"journals":{"fragments":{"compressionCodec":"ZSTANDARD","flushInterval":"15m"}},"derive":{"using":{"connector":{"image":"some/image:tag","config":{"remote":"https://example/api"}}},"transforms":[{"name":"do-the-thing","source":"src/collection","shuffle":"any","lambda":42}],"shards":{"disable":true,"minTxnDuration":"15s","maxTxnDuration":"6m","hotStandbys":2,"ringBufferSize":12345,"readChannelSize":6789}}},"d3/collection":{"writeSchema":"collection.write.schema.yaml","readSchema":"collection.read.schema.yaml","key":["/some/key"],"derive":{"using":{"sqlite":{"migrations":["create table foo(bar int);\n","collection.migration.1.sql"]}},"transforms":[{"name":"frob","source":"src/collection","shuffle":{"lambda":"collection.lambda.frob.shuffle.sql"},"lambda":"collection.lambda.frob.sql"}],"shuffleKeyTypes":["string","integer"]}},"d4/local":{"schema":"local.schema.yaml","key":["/key"],"derive":{"using":{"local":{"command":["some-command","--with-args"],"config":{"some-local":"config"}}},"transforms":[]}}}},
+            content_dom: {"collections":{"d1/collection":{"schema":"collection.schema.yaml","key":["/d1-key"],"derive":{"using":{"typescript":{"module":"collection.ts"}},"transforms":[{"name":"some-name","source":{"name":"src/collection","partitions":{"include":{"a_field":["foo",42]},"exclude":{"other_field":[false]}},"notBefore":"2017-03-03T03:02:01Z","notAfter":"2019-03-06T09:30:02Z"},"shuffle":{"key":["/shuffle","/key"]},"priority":32,"readDelay":"1h"}]}},"d2/collection":{"schema":"collection.schema.yaml","key":["/d2-key"],"journals":{"fragments":{"compressionCodec":"ZSTANDARD","flushInterval":"15m"}},"derive":{"using":{"connector":{"image":"some/image:tag","config":{"remote":"https://example/api"}}},"transforms":[{"name":"do-the-thing","source":"src/collection","shuffle":"any","lambda":42,"backfill":2}],"shards":{"disable":true,"minTxnDuration":"15s","maxTxnDuration":"6m","hotStandbys":2,"ringBufferSize":12345,"readChannelSize":6789}}},"d3/collection":{"writeSchema":"collection.write.schema.yaml","readSchema":"collection.read.schema.yaml","key":["/some/key"],"derive":{"using":{"sqlite":{"migrations":["create table foo(bar int);\n","collection.migration.1.sql"]}},"transforms":[{"name":"frob","source":"src/collection","shuffle":{"lambda":"collection.lambda.frob.shuffle.sql"},"lambda":"collection.lambda.frob.sql"}],"shuffleKeyTypes":["string","integer"]}},"d4/local":{"schema":"local.schema.yaml","key":["/key"],"derive":{"using":{"local":{"command":["some-command","--with-args"],"config":{"some-local":"config"}}},"transforms":[]}}}},
         },
         Resource {
             resource: test://example/collection.lambda.frob.shuffle.sql,
diff --git a/crates/sources/src/scenarios/snapshots/sources__scenarios__test__derivations.snap b/crates/sources/src/scenarios/snapshots/sources__scenarios__test__derivations.snap
index 816e0a9cba..93763ee56e 100644
--- a/crates/sources/src/scenarios/snapshots/sources__scenarios__test__derivations.snap
+++ b/crates/sources/src/scenarios/snapshots/sources__scenarios__test__derivations.snap
@@ -79,7 +79,8 @@ Sources {
                     "name": "do-the-thing",
                     "source": "src/collection",
                     "shuffle": "any",
-                    "lambda": 42
+                    "lambda": 42,
+                    "backfill": 2
                   }
                 ],
                 "shards": {
@@ -230,7 +231,7 @@ Sources {
             resource: test://example/catalog.yaml,
             content_type: "CATALOG",
             content: ".. binary ..",
-            content_dom: {"collections":{"d1/collection":{"derive":{"transforms":[{"name":"some-name","priority":32,"readDelay":"1 hour","shuffle":{"key":["/shuffle","/key"]},"source":{"name":"src/collection","notAfter":"2019-03-06T09:30:02Z","notBefore":"2017-03-03T03:02:01Z","partitions":{"exclude":{"other_field":[false]},"include":{"a_field":["foo",42]}}}}],"using":{"typescript":{"module":"catalog.ts"}}},"key":["/d1-key"],"schema":"a-schema.json"},"d2/collection":{"derive":{"shards":{"disable":true,"hotStandbys":2,"maxTxnDuration":"6m","minTxnDuration":"15s","readChannelSize":6789,"ringBufferSize":12345},"transforms":[{"lambda":42,"name":"do-the-thing","shuffle":"any","source":"src/collection"}],"using":{"connector":{"config":{"remote":"https://example/api"},"image":"some/image:tag"}}},"journals":{"fragments":{"compressionCodec":"ZSTANDARD","flushInterval":"15m"}},"key":["/d2-key"],"schema":"a-schema.json"},"d3/collection":{"derive":{"shuffleKeyTypes":["string","integer"],"transforms":[{"lambda":"select 'a long string which makes this a larger lambda' * from foo;\n","name":"frob","shuffle":{"lambda":"sql/shuffle_lambda.sql"},"source":"src/collection"}],"using":{"sqlite":{"migrations":["create table foo(bar int);\n","sql/migration_two.sql"]}}},"key":["/some/key"],"readSchema":"other-schema.json","writeSchema":"a-schema.json"},"d4/local":{"derive":{"transforms":[],"using":{"local":{"command":["some-command","--with-args"],"config":{"some-local":"config"}}}},"key":["/key"],"schema":"a-schema.json"}}},
+            content_dom: {"collections":{"d1/collection":{"derive":{"transforms":[{"name":"some-name","priority":32,"readDelay":"1 hour","shuffle":{"key":["/shuffle","/key"]},"source":{"name":"src/collection","notAfter":"2019-03-06T09:30:02Z","notBefore":"2017-03-03T03:02:01Z","partitions":{"exclude":{"other_field":[false]},"include":{"a_field":["foo",42]}}}}],"using":{"typescript":{"module":"catalog.ts"}}},"key":["/d1-key"],"schema":"a-schema.json"},"d2/collection":{"derive":{"shards":{"disable":true,"hotStandbys":2,"maxTxnDuration":"6m","minTxnDuration":"15s","readChannelSize":6789,"ringBufferSize":12345},"transforms":[{"backfill":2,"lambda":42,"name":"do-the-thing","shuffle":"any","source":"src/collection"}],"using":{"connector":{"config":{"remote":"https://example/api"},"image":"some/image:tag"}}},"journals":{"fragments":{"compressionCodec":"ZSTANDARD","flushInterval":"15m"}},"key":["/d2-key"],"schema":"a-schema.json"},"d3/collection":{"derive":{"shuffleKeyTypes":["string","integer"],"transforms":[{"lambda":"select 'a long string which makes this a larger lambda' * from foo;\n","name":"frob","shuffle":{"lambda":"sql/shuffle_lambda.sql"},"source":"src/collection"}],"using":{"sqlite":{"migrations":["create table foo(bar int);\n","sql/migration_two.sql"]}}},"key":["/some/key"],"readSchema":"other-schema.json","writeSchema":"a-schema.json"},"d4/local":{"derive":{"transforms":[],"using":{"local":{"command":["some-command","--with-args"],"config":{"some-local":"config"}}}},"key":["/key"],"schema":"a-schema.json"}}},
         },
         Resource {
             resource: test://example/other-schema.json,
diff --git a/crates/sources/src/scenarios/snapshots/sources__scenarios__test__endpoints_captures_materializations-2.snap b/crates/sources/src/scenarios/snapshots/sources__scenarios__test__endpoints_captures_materializations-2.snap
index ee61db1f01..0be2631258 100644
--- a/crates/sources/src/scenarios/snapshots/sources__scenarios__test__endpoints_captures_materializations-2.snap
+++ b/crates/sources/src/scenarios/snapshots/sources__scenarios__test__endpoints_captures_materializations-2.snap
@@ -17,7 +17,8 @@ Sources {
               "bindings": [
                 {
                   "resource": "test://example/resource/not/found.yaml",
-                  "target": "some/collection"
+                  "target": "some/collection",
+                  "backfill": 2
                 }
               ]
             },
@@ -93,7 +94,8 @@ Sources {
                 },
                 {
                   "resource": {"extra":"stuff"},
-                  "target": "other/collection"
+                  "target": "other/collection",
+                  "backfill": 1
                 }
               ]
             },
@@ -240,7 +242,8 @@ Sources {
                   "source": "some/source/collection",
                   "fields": {
                     "recommended": true
-                  }
+                  },
+                  "backfill": 3
                 }
               ]
             },
diff --git a/crates/sources/src/scenarios/snapshots/sources__scenarios__test__endpoints_captures_materializations-3.snap b/crates/sources/src/scenarios/snapshots/sources__scenarios__test__endpoints_captures_materializations-3.snap
index 3313a462ce..174677f025 100644
--- a/crates/sources/src/scenarios/snapshots/sources__scenarios__test__endpoints_captures_materializations-3.snap
+++ b/crates/sources/src/scenarios/snapshots/sources__scenarios__test__endpoints_captures_materializations-3.snap
@@ -17,7 +17,8 @@ Sources {
               "bindings": [
                 {
                   "resource": "config-missing.resource.0.config.yaml",
-                  "target": "some/collection"
+                  "target": "some/collection",
+                  "backfill": 2
                 }
               ]
             },
@@ -93,7 +94,8 @@ Sources {
                 },
                 {
                   "resource": {"extra":"stuff"},
-                  "target": "other/collection"
+                  "target": "other/collection",
+                  "backfill": 1
                 }
               ]
             },
@@ -264,7 +266,8 @@ Sources {
                   "source": "some/source/collection",
                   "fields": {
                     "recommended": true
-                  }
+                  },
+                  "backfill": 3
                 }
               ]
             },
@@ -294,7 +297,7 @@ Sources {
             resource: test://example/catalog.yaml,
             content_type: "CATALOG",
             content: ".. binary ..",
-            content_dom: {"captures":{"capture/config-missing":{"endpoint":{"connector":{"image":"another/image","config":"config-missing.config.yaml"}},"bindings":[{"resource":"config-missing.resource.0.config.yaml","target":"some/collection"}]},"capture/config-raw":{"endpoint":{"connector":{"image":"another/image","config":"config-raw.config.yaml"}},"bindings":[]},"capture/local":{"endpoint":{"local":{"command":["do-the-thing","--arg=one","--arg","two"],"config":{"some":"local config"}}},"bindings":[]},"capture/second":{"endpoint":{"connector":{"image":"another/image","config":"second.config.yaml"}},"bindings":[{"resource":"second.resource.0.config.yaml","target":"third/collection"}],"interval":"3m","shards":{"maxTxnDuration":"30s","logLevel":"debug"}},"first/capture":{"endpoint":{"connector":{"image":"an/image","config":"capture.config.yaml"}},"bindings":[{"resource":{"stream":"contents"},"target":"a/collection"},{"resource":{"extra":"stuff"},"target":"other/collection"}]}},"materializations":{"a/materialization":{"sourceCapture":"a/capture","endpoint":{"connector":{"image":"materialization/image","config":{"its":"config"}}},"bindings":[{"resource":{"table":"table_one"},"source":"source/collection","fields":{"recommended":true}},{"resource":{"table":"table_two"},"source":{"name":"other/source/collection","partitions":{"include":{"a_field":["some-val"]},"exclude":{"other":[42]}}},"fields":{"include":{"add":{}},"exclude":["del"],"recommended":true}}]},"materialization/local":{"endpoint":{"local":{"command":["do-the-thing","--arg=one","--arg","two"],"config":{"some":"local config"}}},"bindings":[{"resource":{"table":"table_three"},"source":"final/source/collection","fields":{"recommended":true}}],"shards":{"ringBufferSize":12345}},"materialization/missing-config":{"endpoint":{"connector":{"image":"materialization/image","config":"missing-config.config.yaml"}},"bindings":[{"resource":"missing-config.resource.0.config.yaml","source":"other/source/collection","fields":{"recommended":true}}]},"materialization/with-config":{"endpoint":{"connector":{"image":"materialization/another:image","config":"with-config.config.yaml"}},"bindings":[{"resource":"with-config.resource.0.config.yaml","source":"some/source/collection","fields":{"recommended":true}}]},"materialization/with-config-fragment":{"endpoint":{"connector":{"image":"materialization/another:image","config":"with-config-fragment.config.yaml"}},"bindings":[]}}},
+            content_dom: {"captures":{"capture/config-missing":{"endpoint":{"connector":{"image":"another/image","config":"config-missing.config.yaml"}},"bindings":[{"resource":"config-missing.resource.0.config.yaml","target":"some/collection","backfill":2}]},"capture/config-raw":{"endpoint":{"connector":{"image":"another/image","config":"config-raw.config.yaml"}},"bindings":[]},"capture/local":{"endpoint":{"local":{"command":["do-the-thing","--arg=one","--arg","two"],"config":{"some":"local config"}}},"bindings":[]},"capture/second":{"endpoint":{"connector":{"image":"another/image","config":"second.config.yaml"}},"bindings":[{"resource":"second.resource.0.config.yaml","target":"third/collection"}],"interval":"3m","shards":{"maxTxnDuration":"30s","logLevel":"debug"}},"first/capture":{"endpoint":{"connector":{"image":"an/image","config":"capture.config.yaml"}},"bindings":[{"resource":{"stream":"contents"},"target":"a/collection"},{"resource":{"extra":"stuff"},"target":"other/collection","backfill":1}]}},"materializations":{"a/materialization":{"sourceCapture":"a/capture","endpoint":{"connector":{"image":"materialization/image","config":{"its":"config"}}},"bindings":[{"resource":{"table":"table_one"},"source":"source/collection","fields":{"recommended":true}},{"resource":{"table":"table_two"},"source":{"name":"other/source/collection","partitions":{"include":{"a_field":["some-val"]},"exclude":{"other":[42]}}},"fields":{"include":{"add":{}},"exclude":["del"],"recommended":true}}]},"materialization/local":{"endpoint":{"local":{"command":["do-the-thing","--arg=one","--arg","two"],"config":{"some":"local config"}}},"bindings":[{"resource":{"table":"table_three"},"source":"final/source/collection","fields":{"recommended":true}}],"shards":{"ringBufferSize":12345}},"materialization/missing-config":{"endpoint":{"connector":{"image":"materialization/image","config":"missing-config.config.yaml"}},"bindings":[{"resource":"missing-config.resource.0.config.yaml","source":"other/source/collection","fields":{"recommended":true}}]},"materialization/with-config":{"endpoint":{"connector":{"image":"materialization/another:image","config":"with-config.config.yaml"}},"bindings":[{"resource":"with-config.resource.0.config.yaml","source":"some/source/collection","fields":{"recommended":true},"backfill":3}]},"materialization/with-config-fragment":{"endpoint":{"connector":{"image":"materialization/another:image","config":"with-config-fragment.config.yaml"}},"bindings":[]}}},
         },
         Resource {
             resource: test://example/config-missing.config.yaml,
diff --git a/crates/sources/src/scenarios/snapshots/sources__scenarios__test__endpoints_captures_materializations.snap b/crates/sources/src/scenarios/snapshots/sources__scenarios__test__endpoints_captures_materializations.snap
index 22644d6c7b..4dc71b3142 100644
--- a/crates/sources/src/scenarios/snapshots/sources__scenarios__test__endpoints_captures_materializations.snap
+++ b/crates/sources/src/scenarios/snapshots/sources__scenarios__test__endpoints_captures_materializations.snap
@@ -17,7 +17,8 @@ Sources {
               "bindings": [
                 {
                   "resource": "resource/not/found.yaml",
-                  "target": "some/collection"
+                  "target": "some/collection",
+                  "backfill": 2
                 }
               ]
             },
@@ -93,7 +94,8 @@ Sources {
                 },
                 {
                   "resource": {"extra":"stuff"},
-                  "target": "other/collection"
+                  "target": "other/collection",
+                  "backfill": 1
                 }
               ]
             },
@@ -306,7 +308,8 @@ Sources {
                   "source": "some/source/collection",
                   "fields": {
                     "recommended": true
-                  }
+                  },
+                  "backfill": 3
                 }
               ]
             },
@@ -330,7 +333,7 @@ Sources {
             resource: test://example/catalog.yaml,
             content_type: "CATALOG",
             content: ".. binary ..",
-            content_dom: {"captures":{"capture/config-missing":{"bindings":[{"resource":"resource/not/found.yaml","target":"some/collection"}],"endpoint":{"connector":{"config":"config/not/found.yaml","image":"another/image"}}},"capture/config-raw":{"bindings":[],"endpoint":{"connector":{"config":"raw-config.foo","image":"another/image"}}},"capture/local":{"bindings":[],"endpoint":{"local":{"command":["do-the-thing","--arg=one","--arg","two"],"config":{"some":"local config"}}}},"capture/second":{"bindings":[{"resource":"referenced/resource.yaml","target":"third/collection"}],"endpoint":{"connector":{"config":"referenced/config.yaml","image":"another/image"}},"interval":"3m","shards":{"logLevel":"debug","maxTxnDuration":"30s"}},"first/capture":{"bindings":[{"resource":{"stream":"contents"},"target":"a/collection"},{"resource":{"extra":"stuff"},"target":"other/collection"}],"endpoint":{"connector":{"config":{"bucket":"foobar","prefix":"path/prefix"},"image":"an/image"}}}},"materializations":{"a/materialization":{"bindings":[{"resource":{"table":"table_one"},"source":"source/collection"},{"fields":{"exclude":["del"],"include":{"add":{}},"recommended":true},"resource":{"table":"table_two"},"source":{"name":"other/source/collection","partitions":{"exclude":{"other":[42]},"include":{"a_field":["some-val"]}}}}],"endpoint":{"connector":{"config":{"its":"config"},"image":"materialization/image"}},"sourceCapture":"a/capture"},"materialization/local":{"bindings":[{"resource":{"table":"table_three"},"source":"final/source/collection"}],"endpoint":{"local":{"command":["do-the-thing","--arg=one","--arg","two"],"config":{"some":"local config"}}},"shards":{"ringBufferSize":12345}},"materialization/missing-config":{"bindings":[{"resource":"referenced/not/found.yaml","source":"other/source/collection"}],"endpoint":{"connector":{"config":"config/not/found.yaml","image":"materialization/image"}}},"materialization/with-config":{"bindings":[{"resource":"referenced/resource.yaml","source":"some/source/collection"}],"endpoint":{"connector":{"config":"referenced/config.yaml","image":"materialization/another:image"}}},"materialization/with-config-fragment":{"bindings":[],"endpoint":{"connector":{"config":"referenced/config.yaml#/bad/fragment","image":"materialization/another:image"}}}}},
+            content_dom: {"captures":{"capture/config-missing":{"bindings":[{"backfill":2,"resource":"resource/not/found.yaml","target":"some/collection"}],"endpoint":{"connector":{"config":"config/not/found.yaml","image":"another/image"}}},"capture/config-raw":{"bindings":[],"endpoint":{"connector":{"config":"raw-config.foo","image":"another/image"}}},"capture/local":{"bindings":[],"endpoint":{"local":{"command":["do-the-thing","--arg=one","--arg","two"],"config":{"some":"local config"}}}},"capture/second":{"bindings":[{"resource":"referenced/resource.yaml","target":"third/collection"}],"endpoint":{"connector":{"config":"referenced/config.yaml","image":"another/image"}},"interval":"3m","shards":{"logLevel":"debug","maxTxnDuration":"30s"}},"first/capture":{"bindings":[{"resource":{"stream":"contents"},"target":"a/collection"},{"backfill":1,"resource":{"extra":"stuff"},"target":"other/collection"}],"endpoint":{"connector":{"config":{"bucket":"foobar","prefix":"path/prefix"},"image":"an/image"}}}},"materializations":{"a/materialization":{"bindings":[{"resource":{"table":"table_one"},"source":"source/collection"},{"fields":{"exclude":["del"],"include":{"add":{}},"recommended":true},"resource":{"table":"table_two"},"source":{"name":"other/source/collection","partitions":{"exclude":{"other":[42]},"include":{"a_field":["some-val"]}}}}],"endpoint":{"connector":{"config":{"its":"config"},"image":"materialization/image"}},"sourceCapture":"a/capture"},"materialization/local":{"bindings":[{"resource":{"table":"table_three"},"source":"final/source/collection"}],"endpoint":{"local":{"command":["do-the-thing","--arg=one","--arg","two"],"config":{"some":"local config"}}},"shards":{"ringBufferSize":12345}},"materialization/missing-config":{"bindings":[{"resource":"referenced/not/found.yaml","source":"other/source/collection"}],"endpoint":{"connector":{"config":"config/not/found.yaml","image":"materialization/image"}}},"materialization/with-config":{"bindings":[{"backfill":3,"resource":"referenced/resource.yaml","source":"some/source/collection"}],"endpoint":{"connector":{"config":"referenced/config.yaml","image":"materialization/another:image"}}},"materialization/with-config-fragment":{"bindings":[],"endpoint":{"connector":{"config":"referenced/config.yaml#/bad/fragment","image":"materialization/another:image"}}}}},
         },
         Resource {
             resource: test://example/raw-config.foo,
diff --git a/crates/sources/src/scenarios/test_derivations.yaml b/crates/sources/src/scenarios/test_derivations.yaml
index b9b251b46b..41061c7ac9 100644
--- a/crates/sources/src/scenarios/test_derivations.yaml
+++ b/crates/sources/src/scenarios/test_derivations.yaml
@@ -57,6 +57,7 @@ test://example/catalog.yaml:
             source: src/collection
             lambda: 42
             shuffle: any
+            backfill: 2
         shards:
           disable: true
           minTxnDuration: 15s
diff --git a/crates/sources/src/scenarios/test_endpoints_captures_materializations.yaml b/crates/sources/src/scenarios/test_endpoints_captures_materializations.yaml
index 3240b85f58..215558b735 100644
--- a/crates/sources/src/scenarios/test_endpoints_captures_materializations.yaml
+++ b/crates/sources/src/scenarios/test_endpoints_captures_materializations.yaml
@@ -13,6 +13,7 @@ test://example/catalog.yaml:
           resource: { stream: "contents" }
         - target: other/collection
           resource: { extra: "stuff" }
+          backfill: 1
 
     capture/second:
       endpoint:
@@ -35,6 +36,7 @@ test://example/catalog.yaml:
       bindings:
         - target: some/collection
           resource: resource/not/found.yaml
+          backfill: 2
 
     capture/config-raw:
       endpoint:
@@ -84,6 +86,7 @@ test://example/catalog.yaml:
       bindings:
         - source: some/source/collection
           resource: referenced/resource.yaml
+          backfill: 3
 
     materialization/with-config-fragment:
       endpoint:
diff --git a/crates/sources/tests/snapshots/schema_generation__catalog_schema_snapshot.snap b/crates/sources/tests/snapshots/schema_generation__catalog_schema_snapshot.snap
index 06f9791479..b9b2715854 100644
--- a/crates/sources/tests/snapshots/schema_generation__catalog_schema_snapshot.snap
+++ b/crates/sources/tests/snapshots/schema_generation__catalog_schema_snapshot.snap
@@ -207,6 +207,13 @@ expression: "&schema"
         "target"
       ],
       "properties": {
+        "backfill": {
+          "title": "Backfill counter for this binding.",
+          "description": "Every increment of this counter will result in a new backfill of this binding from the captured endpoint. For example when capturing from a SQL table, incrementing this counter will cause the table to be re-captured in its entirety from the source database.\n\nNote that a backfill does *not* truncate the target collection, and documents published by a backfilled binding will coexist with (and be ordered after) any documents which were published as part of a preceding backfill.",
+          "type": "integer",
+          "format": "uint32",
+          "minimum": 0.0
+        },
         "disable": {
           "title": "Whether to disable the binding",
           "description": "Disabled bindings are inactive, and not validated. They can be used to represent discovered resources that are intentionally not being captured.",
@@ -776,6 +783,13 @@ expression: "&schema"
         "source"
       ],
       "properties": {
+        "backfill": {
+          "title": "Backfill counter for this binding.",
+          "description": "Every increment of this counter will result in a new backfill of this binding from its source collection to its materialized resource. For example when materializing to a SQL table, incrementing this counter causes the table to be dropped and then rebuilt by re-reading the source collection.",
+          "type": "integer",
+          "format": "uint32",
+          "minimum": 0.0
+        },
         "disable": {
           "title": "Whether to disable the binding",
           "description": "Disabled bindings are inactive, and not validated.",
@@ -1310,6 +1324,13 @@ expression: "&schema"
         "source"
       ],
       "properties": {
+        "backfill": {
+          "title": "Backfill counter for this transform.",
+          "description": "Every increment of this counter will result in a new backfill of this transform. Specifically, the transform's lambda will be re-invoked for every applicable document of its source collection.\n\nNote that a backfill does *not* truncate the derived collection, and documents published by a backfilled transform will coexist with (and be ordered after) any documents which were published as part of a preceding backfill.",
+          "type": "integer",
+          "format": "uint32",
+          "minimum": 0.0
+        },
         "disable": {
           "title": "Whether to disable this transform.",
           "description": "Disabled transforms are completely ignored at runtime and are not validated.",
diff --git a/crates/validation/src/capture.rs b/crates/validation/src/capture.rs
index 32d566e527..abf08e3aaa 100644
--- a/crates/validation/src/capture.rs
+++ b/crates/validation/src/capture.rs
@@ -109,15 +109,21 @@ pub async fn walk_all_captures(
                 let capture::request::validate::Binding {
                     resource_config_json,
                     collection,
+                    backfill,
                 } = binding_request;
 
                 let capture::response::validated::Binding { resource_path } = binding_response;
+
+                let state_key = assemble::encode_state_key(resource_path, backfill);
+
                 (
                     binding_index,
                     flow::capture_spec::Binding {
                         resource_config_json,
                         resource_path: resource_path.clone(),
                         collection,
+                        backfill,
+                        state_key,
                     },
                 )
             })
@@ -258,6 +264,7 @@ fn walk_capture_binding<'a>(
         resource,
         target,
         disable: _,
+        backfill,
     } = binding;
 
     // We must resolve the target collection to continue.
@@ -274,6 +281,7 @@ fn walk_capture_binding<'a>(
     let request = capture::request::validate::Binding {
         resource_config_json: resource.to_string(),
         collection: Some(built_collection.spec.clone()),
+        backfill: *backfill,
     };
 
     Some(request)
@@ -298,7 +306,10 @@ fn extract_validated(
 
     let Some(validated) = response.validated else {
         return Err(Error::Connector {
-            detail: anyhow::anyhow!("expected Validated but got {}", serde_json::to_string(&response).unwrap()),
+            detail: anyhow::anyhow!(
+                "expected Validated but got {}",
+                serde_json::to_string(&response).unwrap()
+            ),
         });
     };
     let network_ports = internal.container.unwrap_or_default().network_ports;
diff --git a/crates/validation/src/derivation.rs b/crates/validation/src/derivation.rs
index e3fd2f882f..829f5965ed 100644
--- a/crates/validation/src/derivation.rs
+++ b/crates/validation/src/derivation.rs
@@ -34,7 +34,11 @@ pub async fn walk_all_derivations(
         // Look at only collections that are derivations,
         // and skip if we cannot map into a BuiltCollection.
         let Some(derive) = derive else { continue };
-        let Ok(built_index) = built_collections.binary_search_by_key(&collection, |b| &b.collection) else { continue };
+        let Ok(built_index) =
+            built_collections.binary_search_by_key(&collection, |b| &b.collection)
+        else {
+            continue;
+        };
 
         let validation = walk_derive_request(
             built_collections,
@@ -98,7 +102,7 @@ pub async fn walk_all_derivations(
 
         let models::Derivation {
             using: _,
-            transforms,
+            transforms: transform_models,
             shards,
             shuffle_key_types: _,
         } = derive;
@@ -145,6 +149,10 @@ pub async fn walk_all_derivations(
             .push(scope, errors);
         }
 
+        // We only validated non-disabled transforms, in transform order.
+        // Filter `transform_models` correspondingly.
+        let transform_models: Vec<_> = transform_models.iter().filter(|b| !b.disable).collect();
+
         let built_transforms: Vec<_> = std::mem::take(transform_requests)
             .into_iter()
             .zip(transform_responses.into_iter())
@@ -152,21 +160,25 @@ pub async fn walk_all_derivations(
             .map(
                 |(transform_index, (transform_request, transform_response))| {
                     let derive::request::validate::Transform {
-                        name,
+                        name: transform_name,
                         collection: source_collection,
                         shuffle_lambda_config_json,
                         lambda_config_json,
+                        backfill,
                     } = transform_request;
 
                     let derive::response::validated::Transform { read_only } = transform_response;
 
                     let models::TransformDef {
-                        priority,
-                        read_delay,
+                        name: _,
                         source,
                         shuffle,
-                        ..
-                    } = &transforms[transform_index];
+                        priority,
+                        read_delay,
+                        lambda: _,
+                        disable: _,
+                        backfill: _,
+                    } = transform_models[transform_index];
 
                     let shuffle_key = match shuffle {
                         models::Shuffle::Key(key) => {
@@ -197,12 +209,13 @@ pub async fn walk_all_derivations(
                     let partition_selector =
                         Some(assemble::journal_selector(source_name, source_partitions));
 
-                    let journal_read_suffix = format!("derive/{}/{}", this_collection, name);
+                    let state_key = assemble::encode_state_key(&[&transform_name], backfill);
+                    let journal_read_suffix = format!("derive/{}/{}", this_collection, state_key);
 
                     (
                         transform_index,
                         flow::collection_spec::derivation::Transform {
-                            name,
+                            name: transform_name,
                             collection: source_collection,
                             partition_selector,
                             priority: *priority,
@@ -214,6 +227,7 @@ pub async fn walk_all_derivations(
                             journal_read_suffix,
                             not_before: not_before.map(assemble::pb_datetime),
                             not_after: not_after.map(assemble::pb_datetime),
+                            backfill,
                         },
                     )
                 },
@@ -456,6 +470,7 @@ fn walk_derive_transform(
         read_delay: _,
         lambda,
         disable: _,
+        backfill,
     } = transform;
 
     indexed::walk_name(
@@ -545,6 +560,7 @@ fn walk_derive_transform(
         collection: Some(source.spec.clone()),
         lambda_config_json: lambda.to_string(),
         shuffle_lambda_config_json,
+        backfill: *backfill,
     };
 
     Some((request, shuffle_types))
@@ -569,7 +585,10 @@ fn extract_validated(
 
     let Some(validated) = response.validated else {
         return Err(Error::Connector {
-            detail: anyhow::anyhow!("expected Validated but got {}", serde_json::to_string(&response).unwrap()),
+            detail: anyhow::anyhow!(
+                "expected Validated but got {}",
+                serde_json::to_string(&response).unwrap()
+            ),
         });
     };
     let network_ports = internal.container.unwrap_or_default().network_ports;
diff --git a/crates/validation/src/materialization.rs b/crates/validation/src/materialization.rs
index 7ce228b711..8804ef1283 100644
--- a/crates/validation/src/materialization.rs
+++ b/crates/validation/src/materialization.rs
@@ -109,6 +109,10 @@ pub async fn walk_all_materializations(
             .push(scope, errors);
         }
 
+        // We only validated non-disabled bindings, in binding order.
+        // Filter `binding_models` correspondingly.
+        let binding_models: Vec<_> = binding_models.iter().filter(|b| !b.disable).collect();
+
         // Join requests and responses to produce tuples
         // of (binding index, built binding).
         let built_bindings: Vec<_> = std::mem::take(binding_requests)
@@ -120,6 +124,7 @@ pub async fn walk_all_materializations(
                     resource_config_json,
                     collection,
                     field_config_json_map: _,
+                    backfill,
                 } = binding_request;
 
                 let materialize::response::validated::Binding {
@@ -128,21 +133,14 @@ pub async fn walk_all_materializations(
                     resource_path,
                 } = binding_response;
 
-                // When we lookup the binding in the model, we need to account
-                // for the presence of disabled bindings, which would cause
-                // binding indexes to differ between the model and the specs
-                // from the validation request/response.
                 let models::MaterializationBinding {
                     ref source,
                     ref fields,
                     disable: _,
                     priority,
                     resource: _,
-                } = binding_models
-                    .iter()
-                    .filter(|b| !b.disable)
-                    .nth(binding_index)
-                    .expect("models bindings are consistent with validation requests bindings");
+                    backfill: _,
+                } = binding_models[binding_index];
 
                 let field_selection = Some(walk_materialization_response(
                     scope.push_prop("bindings").push_item(binding_index),
@@ -170,11 +168,8 @@ pub async fn walk_all_materializations(
                 let partition_selector =
                     Some(assemble::journal_selector(source_name, source_partitions));
 
-                let journal_read_suffix = format!(
-                    "materialize/{}/{}",
-                    materialization,
-                    assemble::encode_resource_path(resource_path),
-                );
+                let state_key = assemble::encode_state_key(resource_path, backfill);
+                let journal_read_suffix = format!("materialize/{}/{}", materialization, state_key);
 
                 (
                     binding_index,
@@ -190,6 +185,8 @@ pub async fn walk_all_materializations(
                         journal_read_suffix,
                         not_before: not_before.map(assemble::pb_datetime),
                         not_after: not_after.map(assemble::pb_datetime),
+                        backfill,
+                        state_key,
                     },
                 )
             })
@@ -336,6 +333,7 @@ fn walk_materialization_binding<'a>(
             },
         disable: _,
         priority: _,
+        backfill,
     } = binding;
 
     let (collection, source_partitions) = match source {
@@ -383,6 +381,7 @@ fn walk_materialization_binding<'a>(
         resource_config_json: resource.to_string(),
         collection: Some(built_collection.spec.clone()),
         field_config_json_map,
+        backfill: *backfill,
     };
 
     Some(request)
@@ -655,7 +654,10 @@ fn extract_validated(
 
     let Some(validated) = response.validated else {
         return Err(Error::Connector {
-            detail: anyhow::anyhow!("expected Validated but got {}", serde_json::to_string(&response).unwrap()),
+            detail: anyhow::anyhow!(
+                "expected Validated but got {}",
+                serde_json::to_string(&response).unwrap()
+            ),
         });
     };
     let network_ports = internal.container.unwrap_or_default().network_ports;
diff --git a/crates/validation/tests/model.yaml b/crates/validation/tests/model.yaml
index d308f20b1f..2c83496769 100644
--- a/crates/validation/tests/model.yaml
+++ b/crates/validation/tests/model.yaml
@@ -111,6 +111,7 @@ test://example/int-string-captures:
           resource:
             stream: other-stream
             namespace: and namespace
+          backfill: 3
       shards:
         hotStandbys: 1
         minTxnDuration: 10s
@@ -150,6 +151,7 @@ test://example/webhook-deliveries:
             include:
               Len: {}
             recommended: false
+          backfill: 7
 
 test://example/webhook-config.yaml:
   address: http://example/webhook
@@ -260,6 +262,7 @@ test://example/int-halve:
             shuffle:
               # Shuffle key is fully covered by logical partition fields.
               key: [/len, /partitionString]
+            backfill: 4
         shards:
           disable: true
 
diff --git a/crates/validation/tests/snapshots/scenario_tests__golden_all_visits.snap b/crates/validation/tests/snapshots/scenario_tests__golden_all_visits.snap
index 218b10c7cc..4e196bdb06 100644
--- a/crates/validation/tests/snapshots/scenario_tests__golden_all_visits.snap
+++ b/crates/validation/tests/snapshots/scenario_tests__golden_all_visits.snap
@@ -228,6 +228,8 @@ All {
                                 derivation: None,
                             },
                         ),
+                        backfill: 3,
+                        state_key: "schema%2Ftable.v3",
                     },
                 ],
                 interval_seconds: 300,
@@ -598,6 +600,8 @@ All {
                                 derivation: None,
                             },
                         ),
+                        backfill: 0,
+                        state_key: "bucke+%2Fpr%40fix",
                     },
                     Binding {
                         resource_config_json: "{\"stream\":\"v2-stream\"}",
@@ -782,6 +786,8 @@ All {
                                 derivation: None,
                             },
                         ),
+                        backfill: 0,
+                        state_key: "other-bucket",
                     },
                 ],
                 interval_seconds: 600,
@@ -1451,6 +1457,7 @@ All {
                                 journal_read_suffix: "derive/testing/from-array-key/withBar",
                                 not_before: None,
                                 not_after: None,
+                                backfill: 0,
                             },
                             Transform {
                                 name: "withFoo",
@@ -1655,6 +1662,7 @@ All {
                                 journal_read_suffix: "derive/testing/from-array-key/withFoo",
                                 not_before: None,
                                 not_after: None,
+                                backfill: 0,
                             },
                         ],
                         shuffle_key_types: [
@@ -2466,6 +2474,7 @@ All {
                                         nanos: 0,
                                     },
                                 ),
+                                backfill: 0,
                             },
                             Transform {
                                 name: "halveSelf",
@@ -2817,9 +2826,10 @@ All {
                                 shuffle_lambda_config_json: "",
                                 lambda_config_json: "null",
                                 read_only: true,
-                                journal_read_suffix: "derive/testing/int-halve/halveSelf",
+                                journal_read_suffix: "derive/testing/int-halve/halveSelf.v4",
                                 not_before: None,
                                 not_after: None,
+                                backfill: 4,
                             },
                         ],
                         shuffle_key_types: [
@@ -3356,6 +3366,7 @@ All {
                                 journal_read_suffix: "derive/testing/int-reverse/reverseIntString",
                                 not_before: None,
                                 not_after: None,
+                                backfill: 0,
                             },
                         ],
                         shuffle_key_types: [],
@@ -4873,6 +4884,8 @@ All {
                         journal_read_suffix: "materialize/testing/db-views/view",
                         not_before: None,
                         not_after: None,
+                        backfill: 0,
+                        state_key: "view",
                     },
                 ],
                 shard_template: Some(
@@ -5302,6 +5315,8 @@ All {
                             },
                         ),
                         not_after: None,
+                        backfill: 0,
+                        state_key: "Web%21hook%2Ffoo%20bar",
                     },
                     Binding {
                         resource_config_json: "{\"fixture\":\"two\"}",
@@ -5666,9 +5681,11 @@ All {
                         ),
                         delta_updates: true,
                         deprecated_shuffle: None,
-                        journal_read_suffix: "materialize/testing/webhook/deliveries/targe+%2Ftwo",
+                        journal_read_suffix: "materialize/testing/webhook/deliveries/targe+%2Ftwo.v7",
                         not_before: None,
                         not_after: None,
+                        backfill: 7,
+                        state_key: "targe+%2Ftwo.v7",
                     },
                 ],
                 shard_template: Some(
@@ -5899,7 +5916,8 @@ All {
               "bindings": [
                 {
                   "resource": {"namespace":"and namespace","stream":"other-stream"},
-                  "target": "testing/int-string"
+                  "target": "testing/int-string",
+                  "backfill": 3
                 }
               ],
               "shards": {
@@ -6060,7 +6078,8 @@ All {
                         "/len",
                         "/partitionString"
                       ]
-                    }
+                    },
+                    "backfill": 4
                   }
                 ],
                 "shards": {
@@ -6409,7 +6428,8 @@ All {
                       "Len": {}
                     },
                     "recommended": false
-                  }
+                  },
+                  "backfill": 7
                 }
               ]
             },
@@ -6457,7 +6477,7 @@ All {
             resource: test://example/int-halve,
             content_type: "CATALOG",
             content: ".. binary ..",
-            content_dom: {"collections":{"testing/int-halve":{"derive":{"shards":{"disable":true},"transforms":[{"name":"halveIntString","shuffle":{"key":["/len","/str"]},"source":{"name":"testing/int-string-rw","notAfter":"2019-03-06T09:30:02Z","partitions":{"exclude":{"bit":[false]},"include":{"bit":[true]}}}},{"name":"halveSelf","shuffle":{"key":["/len","/partitionString"]},"source":{"name":"testing/int-halve"}}],"using":{"typescript":{"module":"int-halve.ts"}}},"journals":{"fragments":{"flushInterval":"15m","length":11223344}},"key":["/int"],"projections":{"Extra":"/extra","Len":{"location":"/len","partition":true},"Root":"","TheString":{"location":"/partitionString","partition":true}},"schema":"test://example/int-string-len.schema"}}},
+            content_dom: {"collections":{"testing/int-halve":{"derive":{"shards":{"disable":true},"transforms":[{"name":"halveIntString","shuffle":{"key":["/len","/str"]},"source":{"name":"testing/int-string-rw","notAfter":"2019-03-06T09:30:02Z","partitions":{"exclude":{"bit":[false]},"include":{"bit":[true]}}}},{"backfill":4,"name":"halveSelf","shuffle":{"key":["/len","/partitionString"]},"source":{"name":"testing/int-halve"}}],"using":{"typescript":{"module":"int-halve.ts"}}},"journals":{"fragments":{"flushInterval":"15m","length":11223344}},"key":["/int"],"projections":{"Extra":"/extra","Len":{"location":"/len","partition":true},"Root":"","TheString":{"location":"/partitionString","partition":true}},"schema":"test://example/int-string-len.schema"}}},
         },
         Resource {
             resource: test://example/int-halve.ts,
@@ -6487,7 +6507,7 @@ All {
             resource: test://example/int-string-captures,
             content_type: "CATALOG",
             content: ".. binary ..",
-            content_dom: {"captures":{"testing/db-cdc":{"bindings":[{"resource":{"namespace":"and namespace","stream":"other-stream"},"target":"testing/int-string"}],"endpoint":{"connector":{"config":"cdc-config.yaml","image":"database"}},"shards":{"hotStandbys":1,"minTxnDuration":"10s"}},"testing/s3-source":{"bindings":[{"resource":{"stream":"a-stream"},"target":"testing/int-string"},{"resource":{"stream":"v2-stream"},"target":"testing/int-string.v2"}],"endpoint":{"connector":{"config":{"bucket":"a-bucket","prefix":"and-prefix"},"image":"s3"}},"interval":"10m"}},"import":["test://example/int-string"]},
+            content_dom: {"captures":{"testing/db-cdc":{"bindings":[{"backfill":3,"resource":{"namespace":"and namespace","stream":"other-stream"},"target":"testing/int-string"}],"endpoint":{"connector":{"config":"cdc-config.yaml","image":"database"}},"shards":{"hotStandbys":1,"minTxnDuration":"10s"}},"testing/s3-source":{"bindings":[{"resource":{"stream":"a-stream"},"target":"testing/int-string"},{"resource":{"stream":"v2-stream"},"target":"testing/int-string.v2"}],"endpoint":{"connector":{"config":{"bucket":"a-bucket","prefix":"and-prefix"},"image":"s3"}},"interval":"10m"}},"import":["test://example/int-string"]},
         },
         Resource {
             resource: test://example/int-string-len.schema,
@@ -6517,7 +6537,7 @@ All {
             resource: test://example/webhook-deliveries,
             content_type: "CATALOG",
             content: ".. binary ..",
-            content_dom: {"import":["test://example/int-string","test://example/int-halve"],"materializations":{"testing/webhook/deliveries":{"bindings":[{"fields":{"exclude":["bit"],"include":{"str":{"pass":"through"}},"recommended":true},"resource":{"fixture":"one"},"source":{"name":"testing/int-string","notBefore":"2017-03-03T03:02:01Z","partitions":{"include":{"bit":[true]}}}},{"fields":{"include":{"Len":{}},"recommended":false},"priority":3,"resource":{"fixture":"two"},"source":"testing/int-halve"}],"endpoint":{"connector":{"config":"webhook-config.yaml","image":"webhook/connector"}}}}},
+            content_dom: {"import":["test://example/int-string","test://example/int-halve"],"materializations":{"testing/webhook/deliveries":{"bindings":[{"fields":{"exclude":["bit"],"include":{"str":{"pass":"through"}},"recommended":true},"resource":{"fixture":"one"},"source":{"name":"testing/int-string","notBefore":"2017-03-03T03:02:01Z","partitions":{"include":{"bit":[true]}}}},{"backfill":7,"fields":{"include":{"Len":{}},"recommended":false},"priority":3,"resource":{"fixture":"two"},"source":"testing/int-halve"}],"endpoint":{"connector":{"config":"webhook-config.yaml","image":"webhook/connector"}}}}},
         },
     ],
     storage_mappings: [
diff --git a/flow.schema.json b/flow.schema.json
index c4484c2d14..f9fb8f091a 100644
--- a/flow.schema.json
+++ b/flow.schema.json
@@ -203,6 +203,13 @@
         "target"
       ],
       "properties": {
+        "backfill": {
+          "title": "Backfill counter for this binding.",
+          "description": "Every increment of this counter will result in a new backfill of this binding from the captured endpoint. For example when capturing from a SQL table, incrementing this counter will cause the table to be re-captured in its entirety from the source database.\n\nNote that a backfill does *not* truncate the target collection, and documents published by a backfilled binding will coexist with (and be ordered after) any documents which were published as part of a preceding backfill.",
+          "type": "integer",
+          "format": "uint32",
+          "minimum": 0.0
+        },
         "disable": {
           "title": "Whether to disable the binding",
           "description": "Disabled bindings are inactive, and not validated. They can be used to represent discovered resources that are intentionally not being captured.",
@@ -772,6 +779,13 @@
         "source"
       ],
       "properties": {
+        "backfill": {
+          "title": "Backfill counter for this binding.",
+          "description": "Every increment of this counter will result in a new backfill of this binding from its source collection to its materialized resource. For example when materializing to a SQL table, incrementing this counter causes the table to be dropped and then rebuilt by re-reading the source collection.",
+          "type": "integer",
+          "format": "uint32",
+          "minimum": 0.0
+        },
         "disable": {
           "title": "Whether to disable the binding",
           "description": "Disabled bindings are inactive, and not validated.",
@@ -1306,6 +1320,13 @@
         "source"
       ],
       "properties": {
+        "backfill": {
+          "title": "Backfill counter for this transform.",
+          "description": "Every increment of this counter will result in a new backfill of this transform. Specifically, the transform's lambda will be re-invoked for every applicable document of its source collection.\n\nNote that a backfill does *not* truncate the derived collection, and documents published by a backfilled transform will coexist with (and be ordered after) any documents which were published as part of a preceding backfill.",
+          "type": "integer",
+          "format": "uint32",
+          "minimum": 0.0
+        },
         "disable": {
           "title": "Whether to disable this transform.",
           "description": "Disabled transforms are completely ignored at runtime and are not validated.",
diff --git a/go/bindings/.snapshots/TestBuildCatalog-all-captures b/go/bindings/.snapshots/TestBuildCatalog-all-captures
index e4b338b3e9..60303f53e3 100644
--- a/go/bindings/.snapshots/TestBuildCatalog-all-captures
+++ b/go/bindings/.snapshots/TestBuildCatalog-all-captures
@@ -1,3 +1,3 @@
 ([]*flow.CaptureSpec) (len=1) {
-  (*flow.CaptureSpec)(name:"example/capture" connector_type:IMAGE config_json:"{\"image\":\"ghcr.io/estuary/source-test:dev\",\"config\":{\"greetings\":1000}}" bindings:<resource_config_json:"{\"stream\":\"greetings\",\"syncMode\":\"incremental\"}" resource_path:"greetings" resource_path:"0" collection:<name:"a/collection" write_schema_json:"{\"$id\":\"file:///build.flow.yaml?ptr=/collections/a~1collection/schema\",\"properties\":{\"a_key\":{\"type\":\"string\"},\"a_val\":{\"type\":\"integer\"}},\"required\":[\"a_key\"],\"type\":\"object\"}" key:"/a_key" uuid_ptr:"/_meta/uuid" projections:<ptr:"/a_key" field:"a_key" is_primary_key:true inference:<types:"string" string:<> exists:MUST > > projections:<ptr:"/a_val" field:"a_val" inference:<types:"integer" exists:MAY > > projections:<field:"flow_document" inference:<types:"object" exists:MUST > > projections:<ptr:"/_meta/uuid" field:"flow_published_at" inference:<types:"string" string:<format:"date-time" content_encoding:"uuid" > title:"Flow Publication Time" description:"Flow publication date-time of this document" exists:MUST > > ack_template_json:"{\"_meta\":{\"ack\":true,\"uuid\":\"DocUUIDPlaceholder-329Bb50aa48EAa9ef\"}}" partition_template:<name:"a/collection" replication:3 labels:<labels:<name:"app.gazette.dev/managed-by" value:"estuary.dev/flow" > labels:<name:"content-type" value:"application/x-ndjson" > labels:<name:"estuary.dev/build" value:"fixture" > labels:<name:"estuary.dev/collection" value:"a/collection" > > fragment:<length:536870912 compression_codec:GZIP stores:"s3://a-bucket/" refresh_interval:<seconds:300 > path_postfix_template:"utc_date={{.Spool.FirstAppendTime.Format \"2006-01-02\"}}/utc_hour={{.Spool.FirstAppendTime.Format \"15\"}}" > flags:4 max_append_rate:4194304 > > > interval_seconds:300 shard_template:<id:"capture/example/capture" recovery_log_prefix:"recovery" hint_prefix:"/estuary/flow/hints" hint_backups:2 max_txn_duration:<seconds:1 > labels:<labels:<name:"app.gazette.dev/managed-by" value:"estuary.dev/flow" > labels:<name:"estuary.dev/build" value:"fixture" > labels:<name:"estuary.dev/log-level" value:"info" > labels:<name:"estuary.dev/task-name" value:"example/capture" > labels:<name:"estuary.dev/task-type" value:"capture" > > ring_buffer_size:65536 read_channel_size:4096 > recovery_log_template:<name:"recovery/capture/example/capture" replication:3 labels:<labels:<name:"app.gazette.dev/managed-by" value:"estuary.dev/flow" > labels:<name:"content-type" value:"application/x-gazette-recoverylog" > labels:<name:"estuary.dev/build" value:"fixture" > labels:<name:"estuary.dev/task-name" value:"example/capture" > labels:<name:"estuary.dev/task-type" value:"capture" > > fragment:<length:268435456 compression_codec:SNAPPY stores:"s3://a-bucket/" refresh_interval:<seconds:300 > > flags:4 max_append_rate:4194304 > )
+  (*flow.CaptureSpec)(name:"example/capture" connector_type:IMAGE config_json:"{\"image\":\"ghcr.io/estuary/source-test:dev\",\"config\":{\"greetings\":1000}}" bindings:<resource_config_json:"{\"stream\":\"greetings\",\"syncMode\":\"incremental\"}" resource_path:"greetings" resource_path:"0" collection:<name:"a/collection" write_schema_json:"{\"$id\":\"file:///build.flow.yaml?ptr=/collections/a~1collection/schema\",\"properties\":{\"a_key\":{\"type\":\"string\"},\"a_val\":{\"type\":\"integer\"}},\"required\":[\"a_key\"],\"type\":\"object\"}" key:"/a_key" uuid_ptr:"/_meta/uuid" projections:<ptr:"/a_key" field:"a_key" is_primary_key:true inference:<types:"string" string:<> exists:MUST > > projections:<ptr:"/a_val" field:"a_val" inference:<types:"integer" exists:MAY > > projections:<field:"flow_document" inference:<types:"object" exists:MUST > > projections:<ptr:"/_meta/uuid" field:"flow_published_at" inference:<types:"string" string:<format:"date-time" content_encoding:"uuid" > title:"Flow Publication Time" description:"Flow publication date-time of this document" exists:MUST > > ack_template_json:"{\"_meta\":{\"ack\":true,\"uuid\":\"DocUUIDPlaceholder-329Bb50aa48EAa9ef\"}}" partition_template:<name:"a/collection" replication:3 labels:<labels:<name:"app.gazette.dev/managed-by" value:"estuary.dev/flow" > labels:<name:"content-type" value:"application/x-ndjson" > labels:<name:"estuary.dev/build" value:"fixture" > labels:<name:"estuary.dev/collection" value:"a/collection" > > fragment:<length:536870912 compression_codec:GZIP stores:"s3://a-bucket/" refresh_interval:<seconds:300 > path_postfix_template:"utc_date={{.Spool.FirstAppendTime.Format \"2006-01-02\"}}/utc_hour={{.Spool.FirstAppendTime.Format \"15\"}}" > flags:4 max_append_rate:4194304 > > state_key:"greetings%2F0" > interval_seconds:300 shard_template:<id:"capture/example/capture" recovery_log_prefix:"recovery" hint_prefix:"/estuary/flow/hints" hint_backups:2 max_txn_duration:<seconds:1 > labels:<labels:<name:"app.gazette.dev/managed-by" value:"estuary.dev/flow" > labels:<name:"estuary.dev/build" value:"fixture" > labels:<name:"estuary.dev/log-level" value:"info" > labels:<name:"estuary.dev/task-name" value:"example/capture" > labels:<name:"estuary.dev/task-type" value:"capture" > > ring_buffer_size:65536 read_channel_size:4096 > recovery_log_template:<name:"recovery/capture/example/capture" replication:3 labels:<labels:<name:"app.gazette.dev/managed-by" value:"estuary.dev/flow" > labels:<name:"content-type" value:"application/x-gazette-recoverylog" > labels:<name:"estuary.dev/build" value:"fixture" > labels:<name:"estuary.dev/task-name" value:"example/capture" > labels:<name:"estuary.dev/task-type" value:"capture" > > fragment:<length:268435456 compression_codec:SNAPPY stores:"s3://a-bucket/" refresh_interval:<seconds:300 > > flags:4 max_append_rate:4194304 > )
 }
diff --git a/go/bindings/.snapshots/TestBuildCatalog-all-materializations b/go/bindings/.snapshots/TestBuildCatalog-all-materializations
index c748cef7f2..f659fd2790 100644
--- a/go/bindings/.snapshots/TestBuildCatalog-all-materializations
+++ b/go/bindings/.snapshots/TestBuildCatalog-all-materializations
@@ -1,3 +1,3 @@
 ([]*flow.MaterializationSpec) (len=1) {
-  (*flow.MaterializationSpec)(name:"example/materialization" connector_type:IMAGE config_json:"{\"image\":\"ghcr.io/estuary/materialize-sqlite:dev\",\"config\":{}}" bindings:<resource_config_json:"{\"table\":\"a_table\"}" resource_path:"a_table" collection:<name:"a/derivation" write_schema_json:"{\"$id\":\"file:///build.flow.yaml?ptr=/collections/a~1derivation/schema\",\"properties\":{\"a_key\":{\"type\":\"string\"}},\"required\":[\"a_key\"],\"type\":\"object\"}" key:"/a_key" uuid_ptr:"/_meta/uuid" projections:<ptr:"/a_key" field:"a_key" is_primary_key:true inference:<types:"string" string:<> exists:MUST > > projections:<field:"flow_document" inference:<types:"object" exists:MUST > > projections:<ptr:"/_meta/uuid" field:"flow_published_at" inference:<types:"string" string:<format:"date-time" content_encoding:"uuid" > title:"Flow Publication Time" description:"Flow publication date-time of this document" exists:MUST > > ack_template_json:"{\"_meta\":{\"ack\":true,\"uuid\":\"DocUUIDPlaceholder-329Bb50aa48EAa9ef\"}}" partition_template:<name:"a/derivation" replication:3 labels:<labels:<name:"app.gazette.dev/managed-by" value:"estuary.dev/flow" > labels:<name:"content-type" value:"application/x-ndjson" > labels:<name:"estuary.dev/build" value:"fixture" > labels:<name:"estuary.dev/collection" value:"a/derivation" > > fragment:<length:536870912 compression_codec:GZIP stores:"s3://a-bucket/" refresh_interval:<seconds:300 > path_postfix_template:"utc_date={{.Spool.FirstAppendTime.Format \"2006-01-02\"}}/utc_hour={{.Spool.FirstAppendTime.Format \"15\"}}" > flags:4 max_append_rate:4194304 > > partition_selector:<include:<labels:<name:"estuary.dev/collection" value:"a/derivation" > > exclude:<> > field_selection:<keys:"a_key" values:"flow_published_at" document:"flow_document" > journal_read_suffix:"materialize/example/materialization/a_table" > shard_template:<id:"materialize/example/materialization" recovery_log_prefix:"recovery" hint_prefix:"/estuary/flow/hints" hint_backups:2 max_txn_duration:<seconds:300 > labels:<labels:<name:"app.gazette.dev/managed-by" value:"estuary.dev/flow" > labels:<name:"estuary.dev/build" value:"fixture" > labels:<name:"estuary.dev/expose-port" value:"8001" > labels:<name:"estuary.dev/hostname" value:"16480cc2f6ecc2c0" > labels:<name:"estuary.dev/log-level" value:"info" > labels:<name:"estuary.dev/task-name" value:"example/materialization" > labels:<name:"estuary.dev/task-type" value:"materialization" > > ring_buffer_size:65536 read_channel_size:4096 > recovery_log_template:<name:"recovery/materialize/example/materialization" replication:3 labels:<labels:<name:"app.gazette.dev/managed-by" value:"estuary.dev/flow" > labels:<name:"content-type" value:"application/x-gazette-recoverylog" > labels:<name:"estuary.dev/build" value:"fixture" > labels:<name:"estuary.dev/task-name" value:"example/materialization" > labels:<name:"estuary.dev/task-type" value:"materialization" > > fragment:<length:268435456 compression_codec:SNAPPY stores:"s3://a-bucket/" refresh_interval:<seconds:300 > > flags:4 max_append_rate:4194304 > network_ports:<number:8001 > )
+  (*flow.MaterializationSpec)(name:"example/materialization" connector_type:IMAGE config_json:"{\"image\":\"ghcr.io/estuary/materialize-sqlite:dev\",\"config\":{}}" bindings:<resource_config_json:"{\"table\":\"a_table\"}" resource_path:"a_table" collection:<name:"a/derivation" write_schema_json:"{\"$id\":\"file:///build.flow.yaml?ptr=/collections/a~1derivation/schema\",\"properties\":{\"a_key\":{\"type\":\"string\"}},\"required\":[\"a_key\"],\"type\":\"object\"}" key:"/a_key" uuid_ptr:"/_meta/uuid" projections:<ptr:"/a_key" field:"a_key" is_primary_key:true inference:<types:"string" string:<> exists:MUST > > projections:<field:"flow_document" inference:<types:"object" exists:MUST > > projections:<ptr:"/_meta/uuid" field:"flow_published_at" inference:<types:"string" string:<format:"date-time" content_encoding:"uuid" > title:"Flow Publication Time" description:"Flow publication date-time of this document" exists:MUST > > ack_template_json:"{\"_meta\":{\"ack\":true,\"uuid\":\"DocUUIDPlaceholder-329Bb50aa48EAa9ef\"}}" partition_template:<name:"a/derivation" replication:3 labels:<labels:<name:"app.gazette.dev/managed-by" value:"estuary.dev/flow" > labels:<name:"content-type" value:"application/x-ndjson" > labels:<name:"estuary.dev/build" value:"fixture" > labels:<name:"estuary.dev/collection" value:"a/derivation" > > fragment:<length:536870912 compression_codec:GZIP stores:"s3://a-bucket/" refresh_interval:<seconds:300 > path_postfix_template:"utc_date={{.Spool.FirstAppendTime.Format \"2006-01-02\"}}/utc_hour={{.Spool.FirstAppendTime.Format \"15\"}}" > flags:4 max_append_rate:4194304 > > partition_selector:<include:<labels:<name:"estuary.dev/collection" value:"a/derivation" > > exclude:<> > field_selection:<keys:"a_key" values:"flow_published_at" document:"flow_document" > journal_read_suffix:"materialize/example/materialization/a_table" state_key:"a_table" > shard_template:<id:"materialize/example/materialization" recovery_log_prefix:"recovery" hint_prefix:"/estuary/flow/hints" hint_backups:2 max_txn_duration:<seconds:300 > labels:<labels:<name:"app.gazette.dev/managed-by" value:"estuary.dev/flow" > labels:<name:"estuary.dev/build" value:"fixture" > labels:<name:"estuary.dev/expose-port" value:"8001" > labels:<name:"estuary.dev/hostname" value:"16480cc2f6ecc2c0" > labels:<name:"estuary.dev/log-level" value:"info" > labels:<name:"estuary.dev/task-name" value:"example/materialization" > labels:<name:"estuary.dev/task-type" value:"materialization" > > ring_buffer_size:65536 read_channel_size:4096 > recovery_log_template:<name:"recovery/materialize/example/materialization" replication:3 labels:<labels:<name:"app.gazette.dev/managed-by" value:"estuary.dev/flow" > labels:<name:"content-type" value:"application/x-gazette-recoverylog" > labels:<name:"estuary.dev/build" value:"fixture" > labels:<name:"estuary.dev/task-name" value:"example/materialization" > labels:<name:"estuary.dev/task-type" value:"materialization" > > fragment:<length:268435456 compression_codec:SNAPPY stores:"s3://a-bucket/" refresh_interval:<seconds:300 > > flags:4 max_append_rate:4194304 > network_ports:<number:8001 > )
 }
diff --git a/go/bindings/.snapshots/TestBuildCatalog-one-capture b/go/bindings/.snapshots/TestBuildCatalog-one-capture
index 9d1d79b6de..31e2c3e045 100644
--- a/go/bindings/.snapshots/TestBuildCatalog-one-capture
+++ b/go/bindings/.snapshots/TestBuildCatalog-one-capture
@@ -1 +1 @@
-(*flow.CaptureSpec)(name:"example/capture" connector_type:IMAGE config_json:"{\"image\":\"ghcr.io/estuary/source-test:dev\",\"config\":{\"greetings\":1000}}" bindings:<resource_config_json:"{\"stream\":\"greetings\",\"syncMode\":\"incremental\"}" resource_path:"greetings" resource_path:"0" collection:<name:"a/collection" write_schema_json:"{\"$id\":\"file:///build.flow.yaml?ptr=/collections/a~1collection/schema\",\"properties\":{\"a_key\":{\"type\":\"string\"},\"a_val\":{\"type\":\"integer\"}},\"required\":[\"a_key\"],\"type\":\"object\"}" key:"/a_key" uuid_ptr:"/_meta/uuid" projections:<ptr:"/a_key" field:"a_key" is_primary_key:true inference:<types:"string" string:<> exists:MUST > > projections:<ptr:"/a_val" field:"a_val" inference:<types:"integer" exists:MAY > > projections:<field:"flow_document" inference:<types:"object" exists:MUST > > projections:<ptr:"/_meta/uuid" field:"flow_published_at" inference:<types:"string" string:<format:"date-time" content_encoding:"uuid" > title:"Flow Publication Time" description:"Flow publication date-time of this document" exists:MUST > > ack_template_json:"{\"_meta\":{\"ack\":true,\"uuid\":\"DocUUIDPlaceholder-329Bb50aa48EAa9ef\"}}" partition_template:<name:"a/collection" replication:3 labels:<labels:<name:"app.gazette.dev/managed-by" value:"estuary.dev/flow" > labels:<name:"content-type" value:"application/x-ndjson" > labels:<name:"estuary.dev/build" value:"fixture" > labels:<name:"estuary.dev/collection" value:"a/collection" > > fragment:<length:536870912 compression_codec:GZIP stores:"s3://a-bucket/" refresh_interval:<seconds:300 > path_postfix_template:"utc_date={{.Spool.FirstAppendTime.Format \"2006-01-02\"}}/utc_hour={{.Spool.FirstAppendTime.Format \"15\"}}" > flags:4 max_append_rate:4194304 > > > interval_seconds:300 shard_template:<id:"capture/example/capture" recovery_log_prefix:"recovery" hint_prefix:"/estuary/flow/hints" hint_backups:2 max_txn_duration:<seconds:1 > labels:<labels:<name:"app.gazette.dev/managed-by" value:"estuary.dev/flow" > labels:<name:"estuary.dev/build" value:"fixture" > labels:<name:"estuary.dev/log-level" value:"info" > labels:<name:"estuary.dev/task-name" value:"example/capture" > labels:<name:"estuary.dev/task-type" value:"capture" > > ring_buffer_size:65536 read_channel_size:4096 > recovery_log_template:<name:"recovery/capture/example/capture" replication:3 labels:<labels:<name:"app.gazette.dev/managed-by" value:"estuary.dev/flow" > labels:<name:"content-type" value:"application/x-gazette-recoverylog" > labels:<name:"estuary.dev/build" value:"fixture" > labels:<name:"estuary.dev/task-name" value:"example/capture" > labels:<name:"estuary.dev/task-type" value:"capture" > > fragment:<length:268435456 compression_codec:SNAPPY stores:"s3://a-bucket/" refresh_interval:<seconds:300 > > flags:4 max_append_rate:4194304 > )
+(*flow.CaptureSpec)(name:"example/capture" connector_type:IMAGE config_json:"{\"image\":\"ghcr.io/estuary/source-test:dev\",\"config\":{\"greetings\":1000}}" bindings:<resource_config_json:"{\"stream\":\"greetings\",\"syncMode\":\"incremental\"}" resource_path:"greetings" resource_path:"0" collection:<name:"a/collection" write_schema_json:"{\"$id\":\"file:///build.flow.yaml?ptr=/collections/a~1collection/schema\",\"properties\":{\"a_key\":{\"type\":\"string\"},\"a_val\":{\"type\":\"integer\"}},\"required\":[\"a_key\"],\"type\":\"object\"}" key:"/a_key" uuid_ptr:"/_meta/uuid" projections:<ptr:"/a_key" field:"a_key" is_primary_key:true inference:<types:"string" string:<> exists:MUST > > projections:<ptr:"/a_val" field:"a_val" inference:<types:"integer" exists:MAY > > projections:<field:"flow_document" inference:<types:"object" exists:MUST > > projections:<ptr:"/_meta/uuid" field:"flow_published_at" inference:<types:"string" string:<format:"date-time" content_encoding:"uuid" > title:"Flow Publication Time" description:"Flow publication date-time of this document" exists:MUST > > ack_template_json:"{\"_meta\":{\"ack\":true,\"uuid\":\"DocUUIDPlaceholder-329Bb50aa48EAa9ef\"}}" partition_template:<name:"a/collection" replication:3 labels:<labels:<name:"app.gazette.dev/managed-by" value:"estuary.dev/flow" > labels:<name:"content-type" value:"application/x-ndjson" > labels:<name:"estuary.dev/build" value:"fixture" > labels:<name:"estuary.dev/collection" value:"a/collection" > > fragment:<length:536870912 compression_codec:GZIP stores:"s3://a-bucket/" refresh_interval:<seconds:300 > path_postfix_template:"utc_date={{.Spool.FirstAppendTime.Format \"2006-01-02\"}}/utc_hour={{.Spool.FirstAppendTime.Format \"15\"}}" > flags:4 max_append_rate:4194304 > > state_key:"greetings%2F0" > interval_seconds:300 shard_template:<id:"capture/example/capture" recovery_log_prefix:"recovery" hint_prefix:"/estuary/flow/hints" hint_backups:2 max_txn_duration:<seconds:1 > labels:<labels:<name:"app.gazette.dev/managed-by" value:"estuary.dev/flow" > labels:<name:"estuary.dev/build" value:"fixture" > labels:<name:"estuary.dev/log-level" value:"info" > labels:<name:"estuary.dev/task-name" value:"example/capture" > labels:<name:"estuary.dev/task-type" value:"capture" > > ring_buffer_size:65536 read_channel_size:4096 > recovery_log_template:<name:"recovery/capture/example/capture" replication:3 labels:<labels:<name:"app.gazette.dev/managed-by" value:"estuary.dev/flow" > labels:<name:"content-type" value:"application/x-gazette-recoverylog" > labels:<name:"estuary.dev/build" value:"fixture" > labels:<name:"estuary.dev/task-name" value:"example/capture" > labels:<name:"estuary.dev/task-type" value:"capture" > > fragment:<length:268435456 compression_codec:SNAPPY stores:"s3://a-bucket/" refresh_interval:<seconds:300 > > flags:4 max_append_rate:4194304 > )
diff --git a/go/bindings/.snapshots/TestBuildCatalog-one-materialization b/go/bindings/.snapshots/TestBuildCatalog-one-materialization
index bb94b61143..f0b5aec443 100644
--- a/go/bindings/.snapshots/TestBuildCatalog-one-materialization
+++ b/go/bindings/.snapshots/TestBuildCatalog-one-materialization
@@ -1 +1 @@
-(*flow.MaterializationSpec)(name:"example/materialization" connector_type:IMAGE config_json:"{\"image\":\"ghcr.io/estuary/materialize-sqlite:dev\",\"config\":{}}" bindings:<resource_config_json:"{\"table\":\"a_table\"}" resource_path:"a_table" collection:<name:"a/derivation" write_schema_json:"{\"$id\":\"file:///build.flow.yaml?ptr=/collections/a~1derivation/schema\",\"properties\":{\"a_key\":{\"type\":\"string\"}},\"required\":[\"a_key\"],\"type\":\"object\"}" key:"/a_key" uuid_ptr:"/_meta/uuid" projections:<ptr:"/a_key" field:"a_key" is_primary_key:true inference:<types:"string" string:<> exists:MUST > > projections:<field:"flow_document" inference:<types:"object" exists:MUST > > projections:<ptr:"/_meta/uuid" field:"flow_published_at" inference:<types:"string" string:<format:"date-time" content_encoding:"uuid" > title:"Flow Publication Time" description:"Flow publication date-time of this document" exists:MUST > > ack_template_json:"{\"_meta\":{\"ack\":true,\"uuid\":\"DocUUIDPlaceholder-329Bb50aa48EAa9ef\"}}" partition_template:<name:"a/derivation" replication:3 labels:<labels:<name:"app.gazette.dev/managed-by" value:"estuary.dev/flow" > labels:<name:"content-type" value:"application/x-ndjson" > labels:<name:"estuary.dev/build" value:"fixture" > labels:<name:"estuary.dev/collection" value:"a/derivation" > > fragment:<length:536870912 compression_codec:GZIP stores:"s3://a-bucket/" refresh_interval:<seconds:300 > path_postfix_template:"utc_date={{.Spool.FirstAppendTime.Format \"2006-01-02\"}}/utc_hour={{.Spool.FirstAppendTime.Format \"15\"}}" > flags:4 max_append_rate:4194304 > > partition_selector:<include:<labels:<name:"estuary.dev/collection" value:"a/derivation" > > exclude:<> > field_selection:<keys:"a_key" values:"flow_published_at" document:"flow_document" > journal_read_suffix:"materialize/example/materialization/a_table" > shard_template:<id:"materialize/example/materialization" recovery_log_prefix:"recovery" hint_prefix:"/estuary/flow/hints" hint_backups:2 max_txn_duration:<seconds:300 > labels:<labels:<name:"app.gazette.dev/managed-by" value:"estuary.dev/flow" > labels:<name:"estuary.dev/build" value:"fixture" > labels:<name:"estuary.dev/expose-port" value:"8001" > labels:<name:"estuary.dev/hostname" value:"16480cc2f6ecc2c0" > labels:<name:"estuary.dev/log-level" value:"info" > labels:<name:"estuary.dev/task-name" value:"example/materialization" > labels:<name:"estuary.dev/task-type" value:"materialization" > > ring_buffer_size:65536 read_channel_size:4096 > recovery_log_template:<name:"recovery/materialize/example/materialization" replication:3 labels:<labels:<name:"app.gazette.dev/managed-by" value:"estuary.dev/flow" > labels:<name:"content-type" value:"application/x-gazette-recoverylog" > labels:<name:"estuary.dev/build" value:"fixture" > labels:<name:"estuary.dev/task-name" value:"example/materialization" > labels:<name:"estuary.dev/task-type" value:"materialization" > > fragment:<length:268435456 compression_codec:SNAPPY stores:"s3://a-bucket/" refresh_interval:<seconds:300 > > flags:4 max_append_rate:4194304 > network_ports:<number:8001 > )
+(*flow.MaterializationSpec)(name:"example/materialization" connector_type:IMAGE config_json:"{\"image\":\"ghcr.io/estuary/materialize-sqlite:dev\",\"config\":{}}" bindings:<resource_config_json:"{\"table\":\"a_table\"}" resource_path:"a_table" collection:<name:"a/derivation" write_schema_json:"{\"$id\":\"file:///build.flow.yaml?ptr=/collections/a~1derivation/schema\",\"properties\":{\"a_key\":{\"type\":\"string\"}},\"required\":[\"a_key\"],\"type\":\"object\"}" key:"/a_key" uuid_ptr:"/_meta/uuid" projections:<ptr:"/a_key" field:"a_key" is_primary_key:true inference:<types:"string" string:<> exists:MUST > > projections:<field:"flow_document" inference:<types:"object" exists:MUST > > projections:<ptr:"/_meta/uuid" field:"flow_published_at" inference:<types:"string" string:<format:"date-time" content_encoding:"uuid" > title:"Flow Publication Time" description:"Flow publication date-time of this document" exists:MUST > > ack_template_json:"{\"_meta\":{\"ack\":true,\"uuid\":\"DocUUIDPlaceholder-329Bb50aa48EAa9ef\"}}" partition_template:<name:"a/derivation" replication:3 labels:<labels:<name:"app.gazette.dev/managed-by" value:"estuary.dev/flow" > labels:<name:"content-type" value:"application/x-ndjson" > labels:<name:"estuary.dev/build" value:"fixture" > labels:<name:"estuary.dev/collection" value:"a/derivation" > > fragment:<length:536870912 compression_codec:GZIP stores:"s3://a-bucket/" refresh_interval:<seconds:300 > path_postfix_template:"utc_date={{.Spool.FirstAppendTime.Format \"2006-01-02\"}}/utc_hour={{.Spool.FirstAppendTime.Format \"15\"}}" > flags:4 max_append_rate:4194304 > > partition_selector:<include:<labels:<name:"estuary.dev/collection" value:"a/derivation" > > exclude:<> > field_selection:<keys:"a_key" values:"flow_published_at" document:"flow_document" > journal_read_suffix:"materialize/example/materialization/a_table" state_key:"a_table" > shard_template:<id:"materialize/example/materialization" recovery_log_prefix:"recovery" hint_prefix:"/estuary/flow/hints" hint_backups:2 max_txn_duration:<seconds:300 > labels:<labels:<name:"app.gazette.dev/managed-by" value:"estuary.dev/flow" > labels:<name:"estuary.dev/build" value:"fixture" > labels:<name:"estuary.dev/expose-port" value:"8001" > labels:<name:"estuary.dev/hostname" value:"16480cc2f6ecc2c0" > labels:<name:"estuary.dev/log-level" value:"info" > labels:<name:"estuary.dev/task-name" value:"example/materialization" > labels:<name:"estuary.dev/task-type" value:"materialization" > > ring_buffer_size:65536 read_channel_size:4096 > recovery_log_template:<name:"recovery/materialize/example/materialization" replication:3 labels:<labels:<name:"app.gazette.dev/managed-by" value:"estuary.dev/flow" > labels:<name:"content-type" value:"application/x-gazette-recoverylog" > labels:<name:"estuary.dev/build" value:"fixture" > labels:<name:"estuary.dev/task-name" value:"example/materialization" > labels:<name:"estuary.dev/task-type" value:"materialization" > > fragment:<length:268435456 compression_codec:SNAPPY stores:"s3://a-bucket/" refresh_interval:<seconds:300 > > flags:4 max_append_rate:4194304 > network_ports:<number:8001 > )
diff --git a/go/protocols/capture/capture.pb.go b/go/protocols/capture/capture.pb.go
index 108be504b1..62ccaa2e36 100644
--- a/go/protocols/capture/capture.pb.go
+++ b/go/protocols/capture/capture.pb.go
@@ -226,10 +226,12 @@ type Request_Validate_Binding struct {
 	// JSON-encoded object which specifies the endpoint resource to be captured.
 	ResourceConfigJson encoding_json.RawMessage `protobuf:"bytes,1,opt,name=resource_config_json,json=resourceConfig,proto3,casttype=encoding/json.RawMessage" json:"resource_config_json,omitempty"`
 	// Collection to be captured.
-	Collection           flow.CollectionSpec `protobuf:"bytes,2,opt,name=collection,proto3" json:"collection"`
-	XXX_NoUnkeyedLiteral struct{}            `json:"-"`
-	XXX_unrecognized     []byte              `json:"-"`
-	XXX_sizecache        int32               `json:"-"`
+	Collection flow.CollectionSpec `protobuf:"bytes,2,opt,name=collection,proto3" json:"collection"`
+	// Backfill counter for this binding.
+	Backfill             uint32   `protobuf:"varint,3,opt,name=backfill,proto3" json:"backfill,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
 }
 
 func (m *Request_Validate_Binding) Reset()         { *m = Request_Validate_Binding{} }
@@ -917,79 +919,79 @@ func init() {
 }
 
 var fileDescriptor_841a70e6e6288f13 = []byte{
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+	// 1152 bytes of a gzipped FileDescriptorProto
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 }
 
 // Reference imports to suppress errors if they are not otherwise used.
@@ -1374,6 +1376,11 @@ func (m *Request_Validate_Binding) MarshalToSizedBuffer(dAtA []byte) (int, error
 		i -= len(m.XXX_unrecognized)
 		copy(dAtA[i:], m.XXX_unrecognized)
 	}
+	if m.Backfill != 0 {
+		i = encodeVarintCapture(dAtA, i, uint64(m.Backfill))
+		i--
+		dAtA[i] = 0x18
+	}
 	{
 		size, err := m.Collection.MarshalToSizedBuffer(dAtA[:i])
 		if err != nil {
@@ -2214,6 +2221,9 @@ func (m *Request_Validate_Binding) ProtoSize() (n int) {
 	}
 	l = m.Collection.ProtoSize()
 	n += 1 + l + sovCapture(uint64(l))
+	if m.Backfill != 0 {
+		n += 1 + sovCapture(uint64(m.Backfill))
+	}
 	if m.XXX_unrecognized != nil {
 		n += len(m.XXX_unrecognized)
 	}
@@ -3299,6 +3309,25 @@ func (m *Request_Validate_Binding) Unmarshal(dAtA []byte) error {
 				return err
 			}
 			iNdEx = postIndex
+		case 3:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Backfill", wireType)
+			}
+			m.Backfill = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowCapture
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.Backfill |= uint32(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
 		default:
 			iNdEx = preIndex
 			skippy, err := skipCapture(dAtA[iNdEx:])
diff --git a/go/protocols/capture/capture.proto b/go/protocols/capture/capture.proto
index 980afd0ef1..279657dc5d 100644
--- a/go/protocols/capture/capture.proto
+++ b/go/protocols/capture/capture.proto
@@ -115,6 +115,8 @@ message Request {
       ];
       // Collection to be captured.
       flow.CollectionSpec collection = 2 [ (gogoproto.nullable) = false ];
+      // Backfill counter for this binding.
+      uint32 backfill = 3;
     }
     repeated Binding bindings = 4;
   }
diff --git a/go/protocols/derive/derive.pb.go b/go/protocols/derive/derive.pb.go
index 46b0503557..6c14dd4526 100644
--- a/go/protocols/derive/derive.pb.go
+++ b/go/protocols/derive/derive.pb.go
@@ -199,10 +199,12 @@ type Request_Validate_Transform struct {
 	// If this transform has no shuffle lambda, this is empty.
 	ShuffleLambdaConfigJson encoding_json.RawMessage `protobuf:"bytes,3,opt,name=shuffle_lambda_config_json,json=shuffleLambdaConfig,proto3,casttype=encoding/json.RawMessage" json:"shuffle_lambda_config_json,omitempty"`
 	// JSON-encoded object which specifies the lambda configuration.
-	LambdaConfigJson     encoding_json.RawMessage `protobuf:"bytes,4,opt,name=lambda_config_json,json=lambdaConfig,proto3,casttype=encoding/json.RawMessage" json:"lambda_config_json,omitempty"`
-	XXX_NoUnkeyedLiteral struct{}                 `json:"-"`
-	XXX_unrecognized     []byte                   `json:"-"`
-	XXX_sizecache        int32                    `json:"-"`
+	LambdaConfigJson encoding_json.RawMessage `protobuf:"bytes,4,opt,name=lambda_config_json,json=lambdaConfig,proto3,casttype=encoding/json.RawMessage" json:"lambda_config_json,omitempty"`
+	// Backfill counter for this transform.
+	Backfill             uint32   `protobuf:"varint,5,opt,name=backfill,proto3" json:"backfill,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
 }
 
 func (m *Request_Validate_Transform) Reset()         { *m = Request_Validate_Transform{} }
@@ -900,85 +902,85 @@ func init() {
 func init() { proto.RegisterFile("go/protocols/derive/derive.proto", fileDescriptor_4410d076c75e1e4f) }
 
 var fileDescriptor_4410d076c75e1e4f = []byte{
-	// 1235 bytes of a gzipped FileDescriptorProto
+	// 1248 bytes of a gzipped FileDescriptorProto
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+	0x94, 0xe1, 0x80, 0xc7, 0xe8, 0x06, 0xd4, 0x19, 0xc9, 0xe5, 0xa8, 0x6b, 0x2b, 0xd1, 0x32, 0xb7,
+	0x79, 0xef, 0x9e, 0xd2, 0x61, 0x6b, 0xf3, 0x5f, 0x56, 0xc0, 0x2d, 0x9b, 0x06, 0xdd, 0x9f, 0xa2,
+	0x4f, 0x47, 0xd3, 0xcf, 0x8d, 0x8b, 0x9b, 0xec, 0x42, 0x02, 0x5d, 0x19, 0xd2, 0x94, 0x72, 0x05,
+	0xe9, 0x0f, 0xa2, 0x98, 0x0a, 0xaf, 0xa2, 0x43, 0x75, 0xde, 0x12, 0xea, 0xbb, 0xc2, 0x63, 0x57,
+	0x39, 0x18, 0x42, 0x5b, 0x1e, 0x4e, 0x29, 0xfd, 0xf6, 0x24, 0xa9, 0xad, 0x81, 0xab, 0x5e, 0x87,
+	0x7d, 0x96, 0xc6, 0x66, 0x7a, 0x37, 0x71, 0x53, 0x29, 0xf6, 0xd2, 0x78, 0xec, 0xdf, 0x83, 0xab,
+	0x33, 0x02, 0xbe, 0xd3, 0xac, 0x6f, 0x42, 0xdd, 0x5c, 0x0b, 0xff, 0x5b, 0x70, 0xcb, 0x66, 0x9f,
+	0x9a, 0x62, 0xce, 0xbc, 0x53, 0xcc, 0x85, 0x86, 0x6d, 0x7b, 0xff, 0x2b, 0x58, 0x9a, 0x6a, 0x63,
+	0xf4, 0x09, 0x98, 0x19, 0x7d, 0x96, 0x45, 0xec, 0x6b, 0x6a, 0x5f, 0xd9, 0xec, 0x18, 0xef, 0xde,
+	0x05, 0xb7, 0x34, 0xa8, 0x6b, 0xad, 0x5f, 0x1e, 0x14, 0xad, 0x9c, 0x19, 0xc0, 0xfe, 0xe5, 0xb3,
+	0x89, 0x6e, 0x3b, 0x9f, 0x39, 0x3b, 0x5f, 0x9f, 0xfc, 0xb9, 0x71, 0xe9, 0xe4, 0xcd, 0x86, 0xf3,
+	0xc7, 0x9b, 0x0d, 0xe7, 0xd7, 0xbf, 0x36, 0x9c, 0x9f, 0xb6, 0x86, 0x91, 0x1c, 0xe5, 0x87, 0x9d,
+	0x80, 0x25, 0xdb, 0x54, 0xc8, 0x9c, 0xf0, 0xb1, 0xf9, 0x4d, 0x31, 0xe3, 0x17, 0xcb, 0x61, 0x5d,
+	0x6b, 0x6e, 0xfe, 0x13, 0x00, 0x00, 0xff, 0xff, 0x83, 0x3a, 0xb3, 0x5b, 0xcf, 0x0c, 0x00, 0x00,
 }
 
 // Reference imports to suppress errors if they are not otherwise used.
@@ -1383,6 +1385,11 @@ func (m *Request_Validate_Transform) MarshalToSizedBuffer(dAtA []byte) (int, err
 		i -= len(m.XXX_unrecognized)
 		copy(dAtA[i:], m.XXX_unrecognized)
 	}
+	if m.Backfill != 0 {
+		i = encodeVarintDerive(dAtA, i, uint64(m.Backfill))
+		i--
+		dAtA[i] = 0x28
+	}
 	if len(m.LambdaConfigJson) > 0 {
 		i -= len(m.LambdaConfigJson)
 		copy(dAtA[i:], m.LambdaConfigJson)
@@ -2221,6 +2228,9 @@ func (m *Request_Validate_Transform) ProtoSize() (n int) {
 	if l > 0 {
 		n += 1 + l + sovDerive(uint64(l))
 	}
+	if m.Backfill != 0 {
+		n += 1 + sovDerive(uint64(m.Backfill))
+	}
 	if m.XXX_unrecognized != nil {
 		n += len(m.XXX_unrecognized)
 	}
@@ -3513,6 +3523,25 @@ func (m *Request_Validate_Transform) Unmarshal(dAtA []byte) error {
 			}
 			m.LambdaConfigJson = encoding_json.RawMessage(dAtA[iNdEx:postIndex])
 			iNdEx = postIndex
+		case 5:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Backfill", wireType)
+			}
+			m.Backfill = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowDerive
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.Backfill |= uint32(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
 		default:
 			iNdEx = preIndex
 			skippy, err := skipDerive(dAtA[iNdEx:])
diff --git a/go/protocols/derive/derive.proto b/go/protocols/derive/derive.proto
index d6a4c7d59e..d22f416456 100644
--- a/go/protocols/derive/derive.proto
+++ b/go/protocols/derive/derive.proto
@@ -65,6 +65,8 @@ message Request {
         (gogoproto.casttype) = "encoding/json.RawMessage",
         json_name = "lambdaConfig"
       ];
+      // Backfill counter for this transform.
+      uint32 backfill = 5;
     }
     repeated Transform transforms = 4;
     // JSON types of shuffle key components extracted by the transforms of this derivation.
diff --git a/go/protocols/flow/flow.pb.go b/go/protocols/flow/flow.pb.go
index a1b2e43bbb..fcb4d7cf11 100644
--- a/go/protocols/flow/flow.pb.go
+++ b/go/protocols/flow/flow.pb.go
@@ -865,10 +865,13 @@ type CollectionSpec_Derivation_Transform struct {
 	// When set, documents before this timestamp are not processed.
 	NotBefore *types.Timestamp `protobuf:"bytes,11,opt,name=not_before,json=notBefore,proto3" json:"not_before,omitempty"`
 	// When set, documents after this timestamp are not processed.
-	NotAfter             *types.Timestamp `protobuf:"bytes,12,opt,name=not_after,json=notAfter,proto3" json:"not_after,omitempty"`
-	XXX_NoUnkeyedLiteral struct{}         `json:"-"`
-	XXX_unrecognized     []byte           `json:"-"`
-	XXX_sizecache        int32            `json:"-"`
+	NotAfter *types.Timestamp `protobuf:"bytes,12,opt,name=not_after,json=notAfter,proto3" json:"not_after,omitempty"`
+	// Backfill counter for this transform.
+	// Every increment of this counter results in a new backfill.
+	Backfill             uint32   `protobuf:"varint,13,opt,name=backfill,proto3" json:"backfill,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
 }
 
 func (m *CollectionSpec_Derivation_Transform) Reset()         { *m = CollectionSpec_Derivation_Transform{} }
@@ -1020,10 +1023,15 @@ type CaptureSpec_Binding struct {
 	// subresource being captured.
 	ResourcePath []string `protobuf:"bytes,2,rep,name=resource_path,json=resourcePath,proto3" json:"resource_path,omitempty"`
 	// Collection to be captured into.
-	Collection           CollectionSpec `protobuf:"bytes,3,opt,name=collection,proto3" json:"collection"`
-	XXX_NoUnkeyedLiteral struct{}       `json:"-"`
-	XXX_unrecognized     []byte         `json:"-"`
-	XXX_sizecache        int32          `json:"-"`
+	Collection CollectionSpec `protobuf:"bytes,3,opt,name=collection,proto3" json:"collection"`
+	// Backfill counter for this binding.
+	// Every increment of this counter results in a new backfill.
+	Backfill uint32 `protobuf:"varint,4,opt,name=backfill,proto3" json:"backfill,omitempty"`
+	// A suggested key to use for this binding within connector states.
+	StateKey             string   `protobuf:"bytes,5,opt,name=state_key,json=stateKey,proto3" json:"state_key,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
 }
 
 func (m *CaptureSpec_Binding) Reset()         { *m = CaptureSpec_Binding{} }
@@ -1139,10 +1147,15 @@ type MaterializationSpec_Binding struct {
 	// When set, documents before this timestamp are not processed.
 	NotBefore *types.Timestamp `protobuf:"bytes,10,opt,name=not_before,json=notBefore,proto3" json:"not_before,omitempty"`
 	// When set, documents after this timestamp are not processed.
-	NotAfter             *types.Timestamp `protobuf:"bytes,11,opt,name=not_after,json=notAfter,proto3" json:"not_after,omitempty"`
-	XXX_NoUnkeyedLiteral struct{}         `json:"-"`
-	XXX_unrecognized     []byte           `json:"-"`
-	XXX_sizecache        int32            `json:"-"`
+	NotAfter *types.Timestamp `protobuf:"bytes,11,opt,name=not_after,json=notAfter,proto3" json:"not_after,omitempty"`
+	// Backfill counter for this binding.
+	// Every increment of this counter results in a new backfill.
+	Backfill uint32 `protobuf:"varint,12,opt,name=backfill,proto3" json:"backfill,omitempty"`
+	// A suggested key to use for this binding within connector state.
+	StateKey             string   `protobuf:"bytes,13,opt,name=state_key,json=stateKey,proto3" json:"state_key,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
 }
 
 func (m *MaterializationSpec_Binding) Reset()         { *m = MaterializationSpec_Binding{} }
@@ -2393,242 +2406,245 @@ func init() {
 func init() { proto.RegisterFile("go/protocols/flow/flow.proto", fileDescriptor_d0677502142fec31) }
 
 var fileDescriptor_d0677502142fec31 = []byte{
-	// 3746 bytes of a gzipped FileDescriptorProto
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+	0x8e, 0xeb, 0x4d, 0xb5, 0xdd, 0x3c, 0xa4, 0xd1, 0xb5, 0x05, 0xb9, 0x7a, 0xf7, 0xa8, 0xd6, 0xea,
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+	0xf4, 0xbf, 0x2e, 0x25, 0xfe, 0x90, 0x92, 0x55, 0xd3, 0xf0, 0x13, 0x9f, 0x8d, 0x5b, 0xc6, 0x62,
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+	0x23, 0x74, 0x00, 0x19, 0xf1, 0xf5, 0xcd, 0x0a, 0x61, 0x8c, 0x15, 0xc2, 0x2d, 0xff, 0xdb, 0x3a,
+	0xb8, 0x6a, 0x56, 0x80, 0x73, 0x31, 0xc4, 0x7f, 0x07, 0xb6, 0x16, 0x87, 0x32, 0xe2, 0x94, 0x40,
+	0x1c, 0x17, 0xc9, 0xc1, 0x84, 0x38, 0x4a, 0x40, 0xb7, 0x21, 0x2b, 0x02, 0x56, 0x75, 0x1d, 0x87,
+	0x88, 0xf0, 0xf4, 0x83, 0x58, 0x71, 0x1c, 0x52, 0xde, 0x86, 0x2d, 0x05, 0x7b, 0x98, 0x30, 0x2c,
+	0x56, 0xf0, 0x6f, 0xcf, 0xb0, 0x47, 0xca, 0x3b, 0x80, 0xc2, 0x44, 0xde, 0x48, 0x94, 0x1f, 0x00,
+	0xaa, 0x1a, 0xcf, 0x34, 0x5b, 0xc7, 0xf4, 0x7b, 0x50, 0xf0, 0xd2, 0x2c, 0xd0, 0x38, 0x35, 0x38,
+	0x75, 0xa4, 0x96, 0x89, 0x29, 0x79, 0x41, 0x16, 0x87, 0x8e, 0xe5, 0x6b, 0xb0, 0xbd, 0x24, 0x2e,
+	0xb4, 0xbe, 0x0f, 0xd9, 0x70, 0x50, 0xd1, 0x4e, 0x83, 0x56, 0x48, 0x81, 0xca, 0xbc, 0x5a, 0xee,
+	0x40, 0x7c, 0x48, 0x27, 0x99, 0x61, 0x63, 0x0a, 0x1f, 0x94, 0xff, 0x58, 0x82, 0x5c, 0xcb, 0x1e,
+	0x63, 0x8f, 0xf8, 0x6b, 0x59, 0x2e, 0xe0, 0xd2, 0xa5, 0x05, 0x3c, 0xec, 0xce, 0xc8, 0xb2, 0x3b,
+	0x57, 0x6a, 0x7b, 0x74, 0xdd, 0xda, 0x5e, 0xfe, 0xa7, 0x08, 0xe4, 0xfd, 0x75, 0xf1, 0x4d, 0xa2,
+	0xbf, 0x90, 0x16, 0x5f, 0xf4, 0xfc, 0xae, 0x9b, 0x76, 0xe8, 0xfc, 0x74, 0x3e, 0xf8, 0x90, 0x5a,
+	0x96, 0xf1, 0x8f, 0x93, 0x3e, 0xa0, 0xec, 0xb4, 0x37, 0xf4, 0x78, 0x27, 0xfc, 0xbd, 0xdf, 0xfb,
+	0xac, 0xf4, 0xce, 0x79, 0x7f, 0x67, 0x39, 0xf3, 0x77, 0x1e, 0x5f, 0xfe, 0xa3, 0xcf, 0x4a, 0x6f,
+	0xaf, 0xc3, 0xde, 0x1d, 0x8d, 0x3c, 0x4c, 0x82, 0xd3, 0x85, 0xc5, 0x6b, 0xd1, 0x6f, 0x42, 0xd6,
+	0x5f, 0x3b, 0x26, 0xba, 0x21, 0x80, 0x23, 0x74, 0xf0, 0xc5, 0x3b, 0xd7, 0x4a, 0x93, 0xe8, 0x86,
+	0x8f, 0x93, 0x42, 0x80, 0x92, 0x8a, 0x0d, 0xb8, 0x7e, 0xfe, 0x5e, 0x2e, 0x6b, 0x47, 0xa3, 0xe1,
+	0x76, 0xf4, 0xcf, 0x22, 0x70, 0x63, 0xa0, 0x79, 0xa7, 0xfe, 0x31, 0x99, 0xeb, 0xbc, 0x98, 0xfb,
+	0x7e, 0xff, 0x26, 0xc4, 0x9c, 0x29, 0xb6, 0x05, 0xf6, 0x95, 0x45, 0x2b, 0x79, 0x3e, 0x73, 0xa5,
+	0x3b, 0xc5, 0xb6, 0xc2, 0xf8, 0x59, 0xac, 0x69, 0x44, 0x63, 0x2f, 0xcb, 0x2a, 0xec, 0xb9, 0xf8,
+	0x57, 0x12, 0xc4, 0x28, 0x0b, 0xda, 0x87, 0x04, 0xff, 0x8c, 0x12, 0x6a, 0xe5, 0xb3, 0x1b, 0x56,
+	0xc4, 0x3c, 0x6a, 0x43, 0x8a, 0x1f, 0x2f, 0xfa, 0x61, 0x54, 0xfb, 0xf5, 0x57, 0x2f, 0x4b, 0xef,
+	0x9e, 0x67, 0xf5, 0x95, 0xff, 0x54, 0xf1, 0x83, 0xc7, 0x56, 0x43, 0x49, 0x32, 0x15, 0x2d, 0xd6,
+	0xd2, 0x10, 0xcd, 0x1d, 0x63, 0xc2, 0x0e, 0x09, 0x19, 0x64, 0xe4, 0x14, 0xe0, 0x24, 0xf6, 0x97,
+	0x8d, 0x12, 0x64, 0x74, 0xcb, 0xc4, 0x36, 0x51, 0x35, 0xc3, 0xf0, 0x4b, 0x1b, 0x70, 0x52, 0xd5,
+	0x30, 0xdc, 0xf2, 0x1f, 0x46, 0xa1, 0xb0, 0xba, 0x7b, 0x11, 0x8a, 0x3d, 0xc8, 0xd1, 0xbd, 0x07,
+	0x1f, 0x66, 0x62, 0x77, 0xef, 0xbc, 0xce, 0x68, 0x22, 0x1a, 0x99, 0xd5, 0xc4, 0x40, 0xc9, 0x3a,
+	0xa1, 0xd1, 0xb9, 0x56, 0x7c, 0x0e, 0xd9, 0xb0, 0x04, 0x7a, 0x00, 0x09, 0x8f, 0x68, 0x64, 0xe6,
+	0x89, 0x76, 0xff, 0xab, 0x97, 0xbc, 0xae, 0xcf, 0x98, 0x15, 0x21, 0x14, 0xf2, 0x45, 0xe4, 0x62,
+	0x5f, 0x94, 0x7f, 0xc0, 0xfe, 0xc4, 0xc3, 0x84, 0x12, 0x10, 0xe9, 0x3e, 0x91, 0x37, 0xd0, 0x36,
+	0x6c, 0xf6, 0x1f, 0x55, 0x95, 0x86, 0xda, 0xe9, 0x0e, 0xd4, 0xc3, 0xee, 0x71, 0xa7, 0x21, 0x4b,
+	0xb4, 0x95, 0xe9, 0x74, 0x55, 0x4e, 0xef, 0x29, 0xad, 0xa3, 0xaa, 0xf2, 0x54, 0x8e, 0xa0, 0x6b,
+	0xb0, 0x45, 0x99, 0x96, 0xc9, 0x51, 0xda, 0x0b, 0xb5, 0x3a, 0x83, 0xa6, 0xd2, 0xa9, 0xb6, 0xd5,
+	0xa6, 0xa2, 0x74, 0x15, 0x39, 0x46, 0x2b, 0x18, 0x67, 0xeb, 0x0f, 0xba, 0xbd, 0x5e, 0xb3, 0x21,
+	0xc7, 0xd1, 0x35, 0x90, 0x7b, 0x5d, 0x65, 0xc0, 0xde, 0x53, 0x6d, 0xb7, 0xbb, 0x1f, 0x34, 0x1b,
+	0xf2, 0x2f, 0x92, 0x6f, 0x77, 0x20, 0x13, 0x42, 0x73, 0x5a, 0x27, 0xeb, 0xd5, 0x41, 0xb5, 0xdd,
+	0x7d, 0x28, 0x6f, 0xd0, 0xc2, 0xf8, 0xb8, 0xdf, 0xed, 0xa8, 0xfd, 0xfa, 0xa3, 0xe6, 0x51, 0x55,
+	0x96, 0xd8, 0x5f, 0x75, 0x58, 0xe1, 0x94, 0x63, 0x74, 0x35, 0x7e, 0x3d, 0xeb, 0xab, 0x87, 0xad,
+	0xef, 0x0c, 0x68, 0x31, 0x8d, 0x1f, 0xfc, 0xb5, 0x04, 0x49, 0xfa, 0x9d, 0x64, 0xda, 0x63, 0xf4,
+	0x2d, 0x80, 0x05, 0x52, 0xa3, 0x1b, 0xdc, 0xaa, 0x2b, 0x80, 0x5e, 0x2c, 0xac, 0x4e, 0x08, 0xc7,
+	0xd4, 0x20, 0x13, 0x42, 0x65, 0x24, 0x18, 0x57, 0x71, 0xbe, 0x78, 0xf3, 0x9c, 0x19, 0xa1, 0xe3,
+	0x3d, 0x48, 0x70, 0xec, 0x42, 0xdb, 0xcb, 0x48, 0xc6, 0x25, 0x77, 0xce, 0x83, 0xb7, 0x83, 0xef,
+	0x42, 0x36, 0xec, 0x79, 0xf4, 0x18, 0xe2, 0xfc, 0xe1, 0xd6, 0x85, 0xe9, 0x5b, 0xdc, 0xbd, 0x38,
+	0x72, 0xf6, 0xa5, 0xaf, 0x4b, 0xb5, 0xfb, 0x9f, 0xfc, 0xdb, 0xee, 0xc6, 0x27, 0x3f, 0xdb, 0x95,
+	0x3e, 0xfd, 0xd9, 0xae, 0xf4, 0xf1, 0xbf, 0xef, 0x4a, 0xdf, 0x7d, 0x6b, 0x6c, 0x92, 0x93, 0xd9,
+	0xb0, 0xa2, 0x3b, 0x93, 0x3b, 0xd8, 0x23, 0x33, 0xcd, 0x9d, 0xf3, 0xbf, 0x45, 0xae, 0xfc, 0x51,
+	0x72, 0x98, 0x60, 0xe3, 0xf7, 0xfe, 0x2f, 0x00, 0x00, 0xff, 0xff, 0xd8, 0x8c, 0x72, 0x9d, 0x44,
+	0x29, 0x00, 0x00,
 }
 
 func (this *UUIDParts) Equal(that interface{}) bool {
@@ -3501,6 +3517,11 @@ func (m *CollectionSpec_Derivation_Transform) MarshalToSizedBuffer(dAtA []byte)
 		i -= len(m.XXX_unrecognized)
 		copy(dAtA[i:], m.XXX_unrecognized)
 	}
+	if m.Backfill != 0 {
+		i = encodeVarintFlow(dAtA, i, uint64(m.Backfill))
+		i--
+		dAtA[i] = 0x68
+	}
 	if m.NotAfter != nil {
 		{
 			size, err := m.NotAfter.MarshalToSizedBuffer(dAtA[:i])
@@ -3803,6 +3824,18 @@ func (m *CaptureSpec_Binding) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 		i -= len(m.XXX_unrecognized)
 		copy(dAtA[i:], m.XXX_unrecognized)
 	}
+	if len(m.StateKey) > 0 {
+		i -= len(m.StateKey)
+		copy(dAtA[i:], m.StateKey)
+		i = encodeVarintFlow(dAtA, i, uint64(len(m.StateKey)))
+		i--
+		dAtA[i] = 0x2a
+	}
+	if m.Backfill != 0 {
+		i = encodeVarintFlow(dAtA, i, uint64(m.Backfill))
+		i--
+		dAtA[i] = 0x20
+	}
 	{
 		size, err := m.Collection.MarshalToSizedBuffer(dAtA[:i])
 		if err != nil {
@@ -3954,6 +3987,18 @@ func (m *MaterializationSpec_Binding) MarshalToSizedBuffer(dAtA []byte) (int, er
 		i -= len(m.XXX_unrecognized)
 		copy(dAtA[i:], m.XXX_unrecognized)
 	}
+	if len(m.StateKey) > 0 {
+		i -= len(m.StateKey)
+		copy(dAtA[i:], m.StateKey)
+		i = encodeVarintFlow(dAtA, i, uint64(len(m.StateKey)))
+		i--
+		dAtA[i] = 0x6a
+	}
+	if m.Backfill != 0 {
+		i = encodeVarintFlow(dAtA, i, uint64(m.Backfill))
+		i--
+		dAtA[i] = 0x60
+	}
 	if m.NotAfter != nil {
 		{
 			size, err := m.NotAfter.MarshalToSizedBuffer(dAtA[:i])
@@ -5648,6 +5693,9 @@ func (m *CollectionSpec_Derivation_Transform) ProtoSize() (n int) {
 		l = m.NotAfter.ProtoSize()
 		n += 1 + l + sovFlow(uint64(l))
 	}
+	if m.Backfill != 0 {
+		n += 1 + sovFlow(uint64(m.Backfill))
+	}
 	if m.XXX_unrecognized != nil {
 		n += len(m.XXX_unrecognized)
 	}
@@ -5754,6 +5802,13 @@ func (m *CaptureSpec_Binding) ProtoSize() (n int) {
 	}
 	l = m.Collection.ProtoSize()
 	n += 1 + l + sovFlow(uint64(l))
+	if m.Backfill != 0 {
+		n += 1 + sovFlow(uint64(m.Backfill))
+	}
+	l = len(m.StateKey)
+	if l > 0 {
+		n += 1 + l + sovFlow(uint64(l))
+	}
 	if m.XXX_unrecognized != nil {
 		n += len(m.XXX_unrecognized)
 	}
@@ -5847,6 +5902,13 @@ func (m *MaterializationSpec_Binding) ProtoSize() (n int) {
 		l = m.NotAfter.ProtoSize()
 		n += 1 + l + sovFlow(uint64(l))
 	}
+	if m.Backfill != 0 {
+		n += 1 + sovFlow(uint64(m.Backfill))
+	}
+	l = len(m.StateKey)
+	if l > 0 {
+		n += 1 + l + sovFlow(uint64(l))
+	}
 	if m.XXX_unrecognized != nil {
 		n += len(m.XXX_unrecognized)
 	}
@@ -8433,6 +8495,25 @@ func (m *CollectionSpec_Derivation_Transform) Unmarshal(dAtA []byte) error {
 				return err
 			}
 			iNdEx = postIndex
+		case 13:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Backfill", wireType)
+			}
+			m.Backfill = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowFlow
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.Backfill |= uint32(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
 		default:
 			iNdEx = preIndex
 			skippy, err := skipFlow(dAtA[iNdEx:])
@@ -9148,6 +9229,57 @@ func (m *CaptureSpec_Binding) Unmarshal(dAtA []byte) error {
 				return err
 			}
 			iNdEx = postIndex
+		case 4:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Backfill", wireType)
+			}
+			m.Backfill = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowFlow
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.Backfill |= uint32(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+		case 5:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field StateKey", wireType)
+			}
+			var stringLen uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowFlow
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				stringLen |= uint64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			intStringLen := int(stringLen)
+			if intStringLen < 0 {
+				return ErrInvalidLengthFlow
+			}
+			postIndex := iNdEx + intStringLen
+			if postIndex < 0 {
+				return ErrInvalidLengthFlow
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.StateKey = string(dAtA[iNdEx:postIndex])
+			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := skipFlow(dAtA[iNdEx:])
@@ -9815,6 +9947,57 @@ func (m *MaterializationSpec_Binding) Unmarshal(dAtA []byte) error {
 				return err
 			}
 			iNdEx = postIndex
+		case 12:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Backfill", wireType)
+			}
+			m.Backfill = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowFlow
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.Backfill |= uint32(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+		case 13:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field StateKey", wireType)
+			}
+			var stringLen uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowFlow
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				stringLen |= uint64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			intStringLen := int(stringLen)
+			if intStringLen < 0 {
+				return ErrInvalidLengthFlow
+			}
+			postIndex := iNdEx + intStringLen
+			if postIndex < 0 {
+				return ErrInvalidLengthFlow
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.StateKey = string(dAtA[iNdEx:postIndex])
+			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := skipFlow(dAtA[iNdEx:])
diff --git a/go/protocols/flow/flow.proto b/go/protocols/flow/flow.proto
index e18b0dfacd..7b0c12371f 100644
--- a/go/protocols/flow/flow.proto
+++ b/go/protocols/flow/flow.proto
@@ -190,7 +190,7 @@ message CollectionSpec {
     ];
     // Transforms of the derivation.
     message Transform {
-      // Next tag: 13.
+      // Next tag: 14.
 
       // Stable name of this transform.
       string name = 1 [ (gogoproto.casttype) = "Transform" ];
@@ -226,6 +226,9 @@ message CollectionSpec {
       google.protobuf.Timestamp not_before = 11;
       // When set, documents after this timestamp are not processed.
       google.protobuf.Timestamp not_after = 12;
+      // Backfill counter for this transform.
+      // Every increment of this counter results in a new backfill.
+      uint32 backfill = 13;
     }
     repeated Transform transforms = 3 [ (gogoproto.nullable) = false ];
     // JSON types of shuffle key components extracted by the transforms of this derivation.
@@ -285,6 +288,8 @@ message CaptureSpec {
   // Bindings are ordered and unique on the bound collection name,
   // and are also unique on the resource path.
   message Binding {
+    // Next tag: 6.
+
     // JSON-encoded configuration of the bound resource.
     string resource_config_json = 1 [
       (gogoproto.casttype) = "encoding/json.RawMessage",
@@ -295,6 +300,11 @@ message CaptureSpec {
     repeated string resource_path = 2;
     // Collection to be captured into.
     CollectionSpec collection = 3 [ (gogoproto.nullable) = false ];
+    // Backfill counter for this binding.
+    // Every increment of this counter results in a new backfill.
+    uint32 backfill = 4;
+    // A suggested key to use for this binding within connector states.
+    string state_key = 5;
   }
   repeated Binding bindings = 4;
   // Minimum interval of time between successive invocations of the capture.
@@ -328,7 +338,7 @@ message MaterializationSpec {
   // materialized. Bindings are ordered and unique on the bound collection name,
   // and are also unique on the resource path.
   message Binding {
-    // Next tag: 12.
+    // Next tag: 14.
 
     // JSON-encoded configuration of the bound resource.
     string resource_config_json = 1 [
@@ -362,6 +372,11 @@ message MaterializationSpec {
     google.protobuf.Timestamp not_before = 10;
     // When set, documents after this timestamp are not processed.
     google.protobuf.Timestamp not_after = 11;
+    // Backfill counter for this binding.
+    // Every increment of this counter results in a new backfill.
+    uint32 backfill = 12;
+    // A suggested key to use for this binding within connector state.
+    string state_key = 13;
   }
   repeated Binding bindings = 4;
   // Template for shards of this materialization.
diff --git a/go/protocols/materialize/materialize.pb.go b/go/protocols/materialize/materialize.pb.go
index 4e31d26cd1..636099a943 100644
--- a/go/protocols/materialize/materialize.pb.go
+++ b/go/protocols/materialize/materialize.pb.go
@@ -238,10 +238,12 @@ type Request_Validate_Binding struct {
 	Collection flow.CollectionSpec `protobuf:"bytes,2,opt,name=collection,proto3" json:"collection"`
 	// Projection configuration, keyed by the projection field name,
 	// with JSON-encoded and driver-defined configuration objects.
-	FieldConfigJsonMap   map[string]encoding_json.RawMessage `protobuf:"bytes,3,rep,name=field_config_json_map,json=fieldConfig,proto3,castvalue=encoding/json.RawMessage" json:"field_config_json_map,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
-	XXX_NoUnkeyedLiteral struct{}                            `json:"-"`
-	XXX_unrecognized     []byte                              `json:"-"`
-	XXX_sizecache        int32                               `json:"-"`
+	FieldConfigJsonMap map[string]encoding_json.RawMessage `protobuf:"bytes,3,rep,name=field_config_json_map,json=fieldConfig,proto3,castvalue=encoding/json.RawMessage" json:"field_config_json_map,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+	// Backfill counter for this binding.
+	Backfill             uint32   `protobuf:"varint,4,opt,name=backfill,proto3" json:"backfill,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
 }
 
 func (m *Request_Validate_Binding) Reset()         { *m = Request_Validate_Binding{} }
@@ -1312,109 +1314,110 @@ func init() {
 }
 
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+	// 1648 bytes of a gzipped FileDescriptorProto
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 }
 
 // Reference imports to suppress errors if they are not otherwise used.
@@ -1796,6 +1799,11 @@ func (m *Request_Validate_Binding) MarshalToSizedBuffer(dAtA []byte) (int, error
 		i -= len(m.XXX_unrecognized)
 		copy(dAtA[i:], m.XXX_unrecognized)
 	}
+	if m.Backfill != 0 {
+		i = encodeVarintMaterialize(dAtA, i, uint64(m.Backfill))
+		i--
+		dAtA[i] = 0x20
+	}
 	if len(m.FieldConfigJsonMap) > 0 {
 		for k := range m.FieldConfigJsonMap {
 			v := m.FieldConfigJsonMap[k]
@@ -3000,6 +3008,9 @@ func (m *Request_Validate_Binding) ProtoSize() (n int) {
 			n += mapEntrySize + 1 + sovMaterialize(uint64(mapEntrySize))
 		}
 	}
+	if m.Backfill != 0 {
+		n += 1 + sovMaterialize(uint64(m.Backfill))
+	}
 	if m.XXX_unrecognized != nil {
 		n += len(m.XXX_unrecognized)
 	}
@@ -4366,6 +4377,25 @@ func (m *Request_Validate_Binding) Unmarshal(dAtA []byte) error {
 			}
 			m.FieldConfigJsonMap[mapkey] = ((encoding_json.RawMessage)(mapvalue))
 			iNdEx = postIndex
+		case 4:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Backfill", wireType)
+			}
+			m.Backfill = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowMaterialize
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.Backfill |= uint32(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
 		default:
 			iNdEx = preIndex
 			skippy, err := skipMaterialize(dAtA[iNdEx:])
diff --git a/go/protocols/materialize/materialize.proto b/go/protocols/materialize/materialize.proto
index 311e7eafb4..8f5dec22d8 100644
--- a/go/protocols/materialize/materialize.proto
+++ b/go/protocols/materialize/materialize.proto
@@ -66,6 +66,8 @@ message Request {
         (gogoproto.castvalue) = "encoding/json.RawMessage",
         json_name = "fieldConfig"
       ];
+      // Backfill counter for this binding.
+      uint32 backfill = 4;
     }
     repeated Binding bindings = 4;
   }