backing up basecamp

Each time, I create a new track in BC, or create one on my 610, then copy it to BC, I make a backup of BC.

I've never needed to restore a backup, so can someone tell me, please, just what it backs up?

Specifically, in  BC, I have created list folders and lists. I have waypoints. When I open BC, I see all these and, with the 610 connected, I see the internal storage of the 610. Does the BC backup create an image off all these, including the internal storage?