Hi Craig,
Is it possible to either exclude mp3 files altogether or just to (at least) exclude them from the compression algorithim.  Since they are large and already compressed, it would chew up a lot of cpu cycles for nothing.  Preferably, I would like to exclude them from the backup.
Then I would let my users know that they are not backed up and maybe give them a single 60GB IDE drive on one of the servers to store them, themselves.
Thanks a lot for all your hard work.  I am just finishing up setting up a backuppc for one of my customers.