Scenario for a single space restore from backup

[micbar]

Is your feature request related to a problem? Please describe.

In the lifetime of an ownCloud instance, it can happen that users delete data which should not be deleted. Even despite the "two
-step" process through the trashbin, it has happened and will happen again. In these cases, a sysadmin team is often ask to restore only a part of the storage snapshot without a full "overwrite from backup"

Describe the solution you'd like

1. Inside the product, which means a new backend feature
2. Additional tooling to work with the storage

Describe alternatives you've considered

A clear and concise description of any alternative solutions or features you've considered.

Additional context

Add any other context or screenshots about the feature request here.

[micbar]

@butonic Any ideas?

@C0rby I remember a CLI tool which you were using to work with the decomposedFS?

[micbar]

@xoxys FYI, thanks for the reminder.

[C0rby]

@butonic Any ideas?

@C0rby I remember a CLI tool which you were using to work with the decomposedFS?

It is https://github.com/c0rby/dcfs but this tool needs to be updated to support the current layout of the dcfs.

[mmattel]

Referencing: #5351 (Add mechanism to commit and freeze writing to storage for taking a backup)

When one has a consistent snapshot available, which is in reality a path to a frozen ressource (more easily with POSIX as all in one, a bit more work with S3 as split), the tool should access a given snapshot, provides a list of available spaces and a method to restore a selected one.