Backups

How do the disk images in Espionage3 get backed up?
I know that time machine etc can be used, but does it matter if the relevant folder is locked or unlocked (and the disk image mounted)?
If the folder is unlocked, what gets backed up if you are using time machine? Is it the folder contents, unencrypted or just the disk image.
On a related question is it possible to unlock the disk image for the folder without using espionage e.g if there was some problem with espionage3? It was possible with espionage2 where you could enter the diskimage/folder password to unlock it
I know that time machine etc can be used, but does it matter if the relevant folder is locked or unlocked (and the disk image mounted)?
If the folder is unlocked, what gets backed up if you are using time machine? Is it the folder contents, unencrypted or just the disk image.
On a related question is it possible to unlock the disk image for the folder without using espionage e.g if there was some problem with espionage3? It was possible with espionage2 where you could enter the diskimage/folder password to unlock it