Is There A Tool To Schedule Registry Backups?

Under Windows 9x and ME, backing up the entire Windows Registry was a relatively simple task for which many free tools were available. PCMag had one called SaveReg2, a simple batch file that would back up the Win9x/ME registry (User.dat and System.dat) and save any quantity I liked and delete the oldest ones as it progressed.The Windows 2000/XP Registries aren't that simple and I see no automated schedulers for backing up just the Registry--the whole registry.I want a tool that will save the entire Registry on a schedule each day or once a week or month, depending on user preferences, save a user-specifiable quantity and, delete the oldest ones when that quantity is reached.With spyware and adware becoming difficult-to-impossible to remove and as destructive to the OS as it has become, this seems an indespensible tool--if it is available anywhere.