Multiple data provider guidance

[JimMadge]

✅ Checklist

• I have searched open and closed issues for duplicates
• This is a request for a change to documentation
• This isn't a feature request or bug report
• This isn't an open-ended question (open a discussion if it is).

📒 Where is the problem?

Related discussion: #1448

Having multiple data providers could cause a number of issues we haven't documented guidance for. In particular,

• One data provider may see the directories/filenames of another data provider
• One data provider may overwrite the directories/files of another data provider

📝 Required documentation changes

• Guidance for best practice to avoid this problems including,
  • Don't use identifiable/sensitive data in file or directory names
  • How to avoid name clashes (e.g. give each provider a unique base directory)
• (Potentially) document workarounds for dealing with multiple providers (e.g. one share per provider and merge)