I'd bet that their stickiest problem will be restoring and replacing all the weird IT-OT interface parts (e.g. some random Windows 98 box which is the only thin

I'd bet that their stickiest problem will be restoring and replacing all the weird IT-OT interface parts (e.g. some random Windows 98 box which is the only thing can run the CNC). No one ever thinks to document or back up those things.