This thread fell off track, but it seems like some of you guys are over-complicating things in terms of backups.
Step 1) sync the project with your primary SD card
Step 2) copy that card’s contents to another SD card OR computer
That’s it. Anything more seems redundantly redundant, which isn’t necessarily a bad thing, but no need to make it harder than it needs to be.
You’re right - sorry about that. But I did a search on BACKUP and this came up.
Getting back to Daefecator’s post #14 above, turns out that when you look at the contents of a SYNCHRONIZED SD card, those are the folders that are contained therein.
So Deafecator and Scudd are right on. I’ll go away now 
Thanks to all!
Those are actually the replica of the actual project BBManager works with.
Their source folders are definitely stored somewhere else on your computer.
UGH! Plot thickens…