CD-ROM is the most flexible way of backing up but can be easily damaged by scratching the top of the disk. Also look at upgrading older style 2xspeed dives that can take half an hour compared with newer drives burning 650mb disk in 8 minutes.
DVD burning is not that common just yet, holding a massive 5-9 gig of data up but can also be easily damaged by scratching the top of the disk.
Information on Burners
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