What tool do you plan on using to copy the files?
Are the servers on the same LAN segment?

I have some experience with Unison, which is much faster than RoboCopy or XCopy processes. (Syncing a 16G folder structure with tens of thousands of files took 80 minutes to process with Robocopy, and took only 3 minutes with Unison. (same number of file changes to replicate - the big difference was detecting what had changed) It's a free tool, and can even do bi-directional syncs. I'd be glad to give a hand getting it running if you're interested.

Glenn
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Actually I am a Rocket Scientist! \:D