I have written batch files to do the job of backing up then I just drag and drop copy to the backup drive on the second PC. With a 100Mbit LAN connection it's pretty quick. If I want to zip them to save space I will use winzip. From there I archive to CD periodically as a belt and braces exercise.
This process is made a bit easier by having a data partition in the first place and also relocating things such as favourites/bookmarks, Outlook pst file etc onto said data partition.
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