It's boring but it works.

Acrosync has released Acrosync for Mac, a new rsync client with a graphical user interface (GUI) that also supports Dropbox-like automatic upload and Time Machine style incremental backups. Acrosync ...

Most Mac backup programs — other than Time Machine — are wrappers for rsync, a Unix utility that efficiently syncs files and directories across drives. My favorite rsync feature is the ability to ...

Note: This requires at least one Mac to work. MacRumors has a great guide on this process. Essentially, you use the great command line tool rsync to synchronize two iTunes libraries. That's a manual ...

I no longer have my Mac, but perhaps this may be of some use to you. <BR><BR>I would have rdiff-backup (works like rsync) fired off by Lingon to back up. Worked kinda like TimeMachine but ...