> A hard drive under the bed is not the only alternative to tarsnap
Also you can back up to the hard drive under your friend's bed, and they can back up to the hard drive under your bed.
If you're even slightly technical, or have a friend who is, I'd recommend both of you buying the cheapest Kirkwood NASes you can find on ebay, throwing Debian on them, and becoming each other's backup buddies.
That's what I do! I have a couple of friends from college and we back up to each other over a VPN. It's a very nice solution to the off-site backup need.