Bash script - for rsync to backup file server running samba.

[Ben Browning]

5 people? Forget all this MAC nonsense, just write a script that tries
to connect to the SMB name twice a day (mid morn and mid afternoon)
and then mounts and backs up if it can. If it succeeds in the AM, skip
the PM one for a given PC.

If they can actually be trusted/convinced to do it, you can give them
homedirs and use WinSCP to keep their user data synced.

~Ben