This software runs quietly in the background; I've used it several times to recover files from mistakes, accidental deletions, bad editing, etc, and never had a problem. It's fast, doesn't tax the system, and works incredibly well. I've been using it on my Linux server now too - the Java client for the Mac, which runs like a real Mac program (unlike many Java apps), can also control the Linux client over SSH. It's inexpensive and EASY - though I do recommend that you take some time to set up appropriate backup directories. Among other things I actually back up my entire iTunes collection... it took a long time to get it there, but now adding an album or two is pretty quick. Go for the Pro version...