I work in a fairly big institution. When we were putting a major system in, we made sure all the data on it was replicated instantly between two sites on the opposite sides of Manchester.
In one planning meeting, a project manager (sigh) asked me “Well, what happens if both sites get taken out at the same time?”
My response was “If that happens me, you and everybody else who cares about the data will almost certainly be dead, so I for one really won’t care any more”