I've been a fan of the backup service Crashplan (crashplan.com) but the service had been crashing on my Mac Book Pro when I upgraded to Mountain Lion (OSX 10.8). I wasn't sure what was going on and googled around.
Changing the memory buffer size for Java has seemed to fix things. I used the instructions here: http://afterhours.bitsandbugs.net/2012/04/18/crashplan-crashing-here-is-the-fix/
Nothing worse than a backup system that doesn't work! I just had one of my Seagate 700 megabyte drives fail on my desktop at work, crashplan is churning away restoring it. It's having some trouble on some files, which is the subject perhaps of a followup post.