On my Mac I've started using Arq: http://www.haystacksoftware.com/arq/ http://www.haystacksoftware.com/arq/ Before that I tried Mozy, iDrive, and a straight Ti

On my Mac I've started using Arq: http://www.haystacksoftware.com/arq/ http://www.haystacksoftware.com/arq/ Before that I tried Mozy, iDrive, and a straight Time Machine backup. After multiple external HD failures and frustrating experiences with Mozy and iDrive (100% CPU for multiple weeks on end, extremely slow upload), I've been quite pleased with Arq. On my non-Mac machines I just use s3cmd sync: http://s3tools.org/s3cmd-sync http://s3tools.org/s3cmd-sync. I guess I could use JungleDisk, but why layer abstraction on something as simple as a file copy? :)