Well, I tried the restore again. I went back to the primary desktop, which if this was a real test would not be there to go back to, and got the serial number. However, on the restoring pc, I could not get past the pc password reset. In a real disaster, when you have nothing working, it will be unlikely that you’ll be able to get your files back from the cloud without heroic effort imho. Hence, it’s not for me and I wouldn’t recommend it. Guess I’ll look for another solution.