I'd like a bit of input on backup software for my Mac Pro. The goal: to backup the contents of one or more hard disks to another disk. I do photography, so I don't feel a big need for RAID 0. RAID 1 is an option, but I'm not sure I want to back-up (mirror) the entire contents of one disk onto another disk -- plus, I believe RAID 1 is instantaneous with it's mirror -- giving me no time to restore from an older copy if I so chose. Apple's "Backup" software and "Retrospect" seem to be the two big choices. Any advocates for either of these softwares? Do both of these programs have the ability to recognize only the files that have changed since the last backup, and will update only those files? Otherwise, seems like a lot of disk wear & tear to backup the entire disk from scratch Sounds like Apple's Time Machine may introduce some other options as well. thanks!