I have two computers and a external USB harddrive. I use CopyTo Synchronizer to keep the runtimes (and a folder with all my zips and installs) the same on all the drives and the external is my back up/transfer device. I synchronize the drive about every week or two, depending on how much stuff i install or rearrange. I also back everything up to cd (no dvd yet) every couple of months. In less than 20 min I can have all my drives/backups synchronized.

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