Hi
Do you have a working backup of the prod machine?
Is it running native on hardware or virtualized eg with Proxmox?
Both would give you options to recover your system/AD - but also a recovery to what you have at the moment.
Assuming your Production Server is running native, directly on hardware. That means you don’t have options like snapshot or live backup underneath your NethServer, to save the whole box.
I would make - if possible - a clone of that production machine using clonezilla or whatever - to another, spare box or big USB disk… (Just so’s you’re covered, in case a disk dies at the moment or whatever goes wrong.).
You can also then try to transfer the machine using Backup / Restore…
Or repair the AD with config reastore. Make a config save, then delete the AD. Restore the config, that will reinstall the AD, usually working correctly!
My 2 cents
Andy