Single file or space restore

[blicknix]

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

Right now we do elaborate the possibility of single file restores or even a restore of a single space for audit reasons. So we have tree different use cases which we have trouble to fine a solution with ocis.

1. A user is deleting a file on purpose in his own space and deletes the trash bin as well. We have backups of the data.
2. A user is deleting a space and we need to backup the space
3. A user is deleted and we need to restore his whole private space

Describe the solution you'd like

In our case the data is saved on a nfs share of which backups are made. But we have no solution on finding the file to restore it after it was deleted on ocis.
So we would like to have a tool to decode the blobs into human readable file paths to extract the file and restore it.

Also we would like to have a possibility to restore a share if it was deleted.

[blicknix]

@butonic As disscussed.

Also the issue #4746 seems like to fine the same solution to our issue.