Depends on the kind of control it's doing. Industrial control requiring milliseconds level availability is extremely hard to fail over. This is how e.g. chip f

Depends on the kind of control it's doing. Industrial control requiring milliseconds level availability is extremely hard to fail over. This is how e.g. chip fabs and chemical plants get such loses on power outages. A power plant might be on order of single second of sustain. The solution there is to actually make the full scale redundancy and compartmentalization or accept the losses. Most of the time we're not dealing with that.