You should never have all your backups on just one drive.
Backups should be in multiple places, on CD/DVD, on another computer, on 2 or 3 external hard disks, and up in the "cloud" on one of the web based backup services (Google, Microsoft, Dropbox etc etc - there are loads of them).
There is a computeractive magazine out the moment about "The cloud" and it lists all the different companies who will rent you disk space on their "cloud" servers for safe keeping.
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