Backup/Sync External Drive

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I'm looking for an inexpensive external drive that I can use for automatic
backups and also to sync files from my desktop to laptop.  Several drives
seem to be able to do this from their ads, but I have XP on my desktop and
Vista on my laptop.  Does this complicate things?  Anyone had any good or
bad experiences with Seagate, Western Digital, Iomega, Toshiba, etc.?

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