(On the latter I hunted around the registry but didn't find anything
obvious).
BTW I should clarify: I *did* find a way to reset the backup notification;
navigate within REGEDIT to HKEY_LOCAL_MACHINE > software> Microsoft > Windows
Current Version > Windows Backup and delete all key values (not the keys
themselves) in that folder and its subfolder System Image Backup. The next
time Backup and Restore is run, Vista announces that no full image backup has
been made.
But there seems to be more to it than that, because the size of my "initial"
image is still around 15GB, so either a) the REAL registry key keeping track
of full and incremental images is elsewhere and less obvious, or b) Vista is
excluding a whole lot of stuff (e.g. about 40 gigs of recorded TV). Since
there doesn't seem to be a way to view the files within that image, I'm
obviously hesitant to delete my hard drive and try a system restore just as
an experiement without some confidence it'll actually work!