Lol well you definately need money. Do you have your two hard drives set on RAID 0? That would definately be a problem. Using newegg or zipzoomfly.com can help you find a value USB 2.0 External Hard Drive. My ex got a 120 GB drive for 100. If you have a CD Burner, choose the files that are the most important to you, and burn them onto a CD. As long as you have the original game CD's, and Windows XP CD, dont worry about backing them up, except for maybe your saved game files. You can always put them back in the proper folder if you have to reinstall.
Or you can get really creative. Open a GMail account with Google (1 GB Mailbox limit) and back up some of your stuff there. I haven't tried that though rofl.