The JSS Setup Utility in Casper 5.11 can create a sterile backup of the JSS
database. The result is encrypted disk image, but I haven't been able to
open it. What password do I need to open the .dmg?
I'm not seeing anything about this in the manual so JAMF or someone else who uses them may have to answer you.
You're lucky. I can't even get a sterile backup to create on my Leopard server. I was going to test some things.
The sterile backups created with the JSS Setup Utility 5.1 or newer use the activation code from your JSS (without dashes) as the password. Your activation code can be found by navigating to the JSS > Admin tab > General Settings > Activation Code tab.