uid/gid translate table with 'Full rsync mode'

[buhtz]

Explained by Germar in parent issue #1311:

Filesystems always store the uid and gid for a file. Not the user/groupname. uid/gid are enumerate by the time of creating each user/group. So if you have an old machine with user foo=uid1000 and user bar=uid1001 and you build a new machine but this time you create user bar first, you'll end up with user foo=uid1001 and user bar=uid1000. If you now restore your files (with BiT root) foo can't access his files but all the files from bar...

[aryoda]

So the use case is:

Restore a backup on a different system (where the setup of the users/groups may different)?

For Linux file systems a chown + chmod could be a decent work-around (add this to our FAQ?).

A similar problem with UID/GIDs occurs with mounted non-Linux (remote) file systems (NTFS, Samba, even NFS) where a translation should be given via the mount command line (uid/gid=...).

How many user complaints do we have regarding this problem ("side effect")? A FAQ entry could possibly suffice for now...