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I made my backup drives bootable with a small linux system doing an automatic rsnapshot and shutdown after that was successful. Since my data doesn't change that much, I can keep a high number of snapshots. Oh, if you're really paranoid, you can measure the time the rsnapshot normally takes and if it all of a sudden takes a lot longer, that's a good ...


Probably the best low-impact solution is to use multiple disks. OSX supports it already. You could keep a regular disk plugged in, and use the second disk on a weekly basis (keeping it unplugged and in a safe location). If your backup gets compromised you only risk losing a week's worth of work. Also, keep your backups encrypted!

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