Was searching for this also..
Go to settings > storage
Under Windows media sync, change storage location to "internal"
(you can always change back. Didn't work without this step)
Plug Bionic to PC USB
Scroll down and tap on USB icon, then change to PC sync
The Motorola software loads
Click on the browse files folders (bottom/left)
I want to make sure I backup everything before I factory default. I've lost paid for apps before and don't want to loose MMS pictures.