Well, the way you have it now is that you have to take the drive around to each and back it up, which isn't terribly painful, but isn't convenient.
I'd generally suggest getting a separate drive for each. That really increases convenience at a small additional cost (mitigated by the fact that the drive doesn't need to be as large, and that data that you back up is worth more than data you lose...)
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--Dave Nanian
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