Not the answer you were probably looking for but :
I'd recommend a commercial backup program such as Ghost or Acronis true image (my favourite). Backup software for data backup and disaster recovery in Windows and Linux - Acronis
Well worth the price -- you can also create bootable media so even if you totally hose up the hard drive(s) you can restore data / partitions etc etc.
Aronis takes care of multi-volumes if you backup to DVD's etc. No probs with network drives or external USB disks either.
You can backup / restore a typical home system in around 35 - 60 mins. Well worth it.
Much better than messing around with Windows backup.
You can also restore individual files even if you have made an "Image" (Partition / Disk) backup .
Testing any sort of OS using programs like acronis gives you backup and restore at any point so if you get hosed up trying to uninstall some anti-virus software for example which won't uininstall cleanly and messes up the registry you can just restore the whole system to the state it was before you installed the offending program for example.