Ouch - a failure of the FD processor would not be fun.
I'm told that when Raytheon were installing a system in Norway, they had it up and running in test mode and the Norwegians asked "How long does it take to restore the system after a total power failure (considering with Gens, UPS etc this would supposedly never happen)?" The Raytheon reps answered something like "Well - almost impossible to happen, but about 24 Hours".
The Norwegians then immediately caused an absolute total power failure (the system died on que) and said "You time starts now....."
Never been able to verify the story - but bet it was fun if it really happened!!