Well I assume there are some smart hacker / security people in the NSA etc. who could be parachuted in to help if it really came to that.

I think these banks will probably be able to hire equivalent people in the private sector though and might not need the government help.

FDIC insures deposits up to 250k. Big institutions basically all have this government backing. If an incident occurs, FDIC has deposits available next business day in event of a bank failure