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Frequency of backups?
I've sometimes found I need to go back farther than just a day or two, so I have six backup sets: MWF, TTS, Sun odd, Sun even, beginning of odd-numbered month, and beginning of even-numbered month. Thus, I always have backups 1 and 2 days old, 1 and 2 weeks old, and 1 and 2 months old.
Yes, I HAVE gone back as much as two months to retrieve lost data.
These backups are on two different physical drives (e.g., MWF is on a different physical drive from TTS), so if one drive dies all is not lost. SuperDuper! makes it easy to do all these backups, and firewire drives are cheap, compared with the value of important data.
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