if you want your backups and protections to work when they are needed, you have to actually integrate usage of them into your standard operations. No amount of "really really careful" testing is an adequate substitute.
Yes!
the factory site at which I worked which at times was probably on the worldwide top ten list for dollar value added across all industries, was so concerned about the single point failure of losing utility power ... that they paid to have several miles of high-voltage connection made to a second point within the utility network.
One of my company's sites did something similar. But no clued person supervised the actual connection. Result: at a certain point close to the site, the two cables ran side by side within a foot or two. Yes, you guessed it: that was exactly where some guy with a backhoe, digging an unrelated hole, got the spot wrong and cut through both lines ...