Windowa 2003 backup domain controller???

I am new to Windows admin enviornment, and my Sr. Administrator is on sick leave. Now the manager of my company has asked me to move the backup domain controller (windows 2003 server) to a new server hardware. The new server hardware has new drives and everything. We have about 70 users on the active directory, so what will be the easiest way to do it. I will appreciate, if any one can help with step by step procedure. Again, as I am new to Windows enviornment, I don’t want to do any mistakes. Thank you!!