2 copy of each upload

[jennijuju]

(design to be added next week by @wjmelements )

[rjan90]

From @wjmelements in Slack:

I have written up a recommendation for GA Replication.
https://www.notion.so/filecoindev/GTM-Replication-280dc41950c180c78684d3eda77c3164
I have also written up a WIP specification for a DistributedStorageProvider based on the "Pseudo SP" idea, which could provide replication and repair.
https://www.notion.so/filecoindev/DistributedStorageProvider-27ddc41950c180878abbe8a064e23f0b

[rjan90]

Closing this ticket in filecoin-services repo, since the contract changes has been made. The missing pieces is having the default replication in synapse-sdk, where the tracking issue is here: FilOzone/synapse-sdk#312