Try buying a CD burner. If you use a CD-RW (a re-writable CD-ROM), you can update your information as often as you like, and keep an up to date record. It would probably be worthwhile to backup your backup every now and again, as CD's can scratch, or break, and doubling up your backup can serve as insurance against Murphy's law (but Murphy will always find a way...).
Judging by the "Black Stump" at the bottom of your post, you're in Oz? I bought a DVD burner the other day for just over AU$200. A CD burner (at a guess) might be around the AU$50 mark, certainly less than AU$100. I remember buying a CD burner not so many years ago for over $2000.
If you are backing up vast amounts of data, maybe tape storage is the way to go. It's slower than a CD, but generally more robust.
It's a dilemma... The number of times I have personally tried to slipstream my business processes, and introduce the "paperless office", I've ended up with more bl@@dy paper than when I started.
Good luck!
