I'm curious how well data centers are protected from such a coordinated attack that involves an insider? Can a determined, educated group of terrorists disable

I'm curious how well data centers are protected from such a coordinated attack that involves an insider? Can a determined, educated group of terrorists disable multiple data centers (e.g. of Amazon) at once? What data center redundancy do the cloud providers have - can they withstand losing 2 data centers at once? How about 5? I'm sure they have good protection against technical accidents. But in the times when everybody moves their apps and systems into the cloud I'm not equally confident the cloud providers are equally well protected against a sophisticated, coordinated attack.