lol. You have a few options.
If you just want to backup your files, and you have such a small hard drive, you can get a cheap USB external hard drive (I got an 80gig for like $140, so I'm sure you can do a lot cheaper than that). Copy your files there, etc.
If you want to network.. You could get two USB wireless network adapters and set up an ad-hoc network. This is a network without a router or hub. That wouldn't be too dificult to do.