DVD-R media (blank DVDs that you can record on, but not erase) are now less than $0.50 each, if you buy a 50-pack. You can get a multi-format DVD burner for around $50 or $60. For archival purposes, these things are starting to look better and better than a second hard drive! 4.7 GB is a lot of space for half a buck. And for about $0.80 each with a 25-pack, you can get DVD-RW media that can be erased and rewritten multiple times. Where do I sign up?
Oh, and this might be a good idea too, to protect that data.