An MVP asked me the other day; "how do I make backup appear like it's not been run?". It occurred to me to post a little note on the registry key:
I'm not going to tell you what all the settings do, as I think the names are pretty intuitive, but this is the location in the hive that the Backup Configuration Wizard uses to store all it's settings. If you remember my SBS Backup Hack on how to swap between tape and disk for the backup target, all I did was manipulate the registry.
How do you make Backup look like it was never run, just delete the entire /Backup registry, the wizard will run like it's brand new.
Of course you'll also have to navigate to %sbsprogramdir%\Backup in the shell and delete the Backup Results.xml and Small Business Backup Script.bks to give it a completely fresh start.