Do you want to mirror the entire install or just some files?
You couldn't mirror the entire install very well because the Hardware config of the laptop is going to be drastically different from that of the desktop. If you've changed too many hardware components, windows will think you're trying to install the OS on multiple computers and shut it down.
For just some files, I use a utility called Backitup. You can download it here http://www.downlinx.com/proghtml/157/15761.htm