1GB? Pah! Use floppies I know somebody actually that had the misfortune of needing to move about 600MB of stuff from one computer to another with only floppies...

Oh hmm.... If it's only 1GB then it's up to you really about what backup you use. If you're going for the cheap route then I'd say just buy a DVD-R drive and a stack of DVD-R discs. You burn it and then lock them in the safe and just throw it away when you're done. This way the disc is new and you don't have any problems of how many times you can reuse it and keeping it the discs clean as you're only ever use it once.