I have used Retrospect in various forms and versions since November 1998. I abandoned it about a year ago and have never looked back. I always suspected that it may be suited for sysadmins in very large enterprises, but more and more it seemed a clunky and confusing solution to the (important) general backup problem. Its only really valuable feature was compressed backups to save space.

I use Time Machine and Super Duper and don't really seem to need anything else. Yes, compressed backups would be nice, but not worth the hassle of figuring out how Retrospect works. An unpredictable or confusing backup is worse than none at all. I'm sure the Retrospect folks have a perfectly clear concept in their minds but it was never clear to me. Sorry.