I've been reading for a couple days and think I have the basics so I bought a used GO720.
Here is my current system (using TTCurrentConfig):
TTGO.BIF:
DeviceName=TomTom GO 720
DeviceVersionHW=GO 720
BootLoaderVersion=10012
ApplicationVersionVersionNumber=9430
ApplicationVersion=890926.1
CurrentMap=North_America_2GB
CurrentMapVersion=705.1481
TTGO.BAK:
Not Found...
TTGO.ORI:
Not Found...
TTNAVIGATOR.BIF:
Not Found...
I used TT Home to upgrade from 8.351 to 9.430 (I hope that wasn't a mistake - do any other versions offer better features?). I did an Explorer backup ...