You can back up either the whole hard drive or various files on it. If you plan to back up the whole HD I would suggest an external HD and follow the link provided by clubman. If you are backing up only certain files then you can do this to CD/DVD (size permitting) using the windows XP back up wizard. This is found in Start menu->All programs->Accessories->Systems tools->Backup.If it is not there then you may need to install this from your windows Cd-rom. It is free and easy to use.