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by seclorum 5436 days ago
Make a 'russian doll' arrangement with your disks - put your smallest disk in the most-used computer, and make full backups of that disk on the next-larger disk, etc.

For example I have an 80gig disk (SSD) in my MBP, its the most-used disk .. I can back this disk up 5 times to my 400gig external hard disk (full disk image each time) .. to do a backup I boot from the external disk, which has a minimal OSX install on it just for this purpose, then I make a full disk image, save it, and reboot.

Do this every week, and you're set ..