How to move a Windows installation to different hardware

This article describes how to create a system state backup on one computer and how to restore it to the same computer or to a different physical computer of the same make and model.

http://support.microsoft.com/kb/249694

Performing a Full Server Recovery of a Domain Controller

http://technet.microsoft.com/en-us/library/cc772519(WS.10).aspx

Backing up your Server

http://technet.microsoft.com/en-us/library/cc753528.aspx