Let's see...
I have my "active data" mirrored daily between two hard disks on my PC. Then there's the weekly copy to a hard disk in a USB bay attached to my router*, and the monthly backup of important changed files onto DVD-R. Plus the "deep storage" on hard disks of older stuff for archive, which I do every year or so onto two hard disks (I have a stack of 20GB hard disks I use for this, heh).
I've also been known to keep a copy of a lot of the important stuff on the laptop, and there's a bunch of irreplaceable stuff which I update every year or so on DVD-R which is held for me at my parents house.
And quite a bit of my work is stored online on wiki's anyway, which come with backups..
(*ASUS WL500g. They're nifty.)
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