Luckily I have not yet been through such a disaster but my customers have. I had a customer whose office was nearly wiped out by a hurricane. Another suffered smoke and water damage because the office one flight up had a fire. One had their computer system stolen. Another had a deer (Yup. Bambie's dad. Antlers and all.) come crashing through a window, rampaged through the office space destroying the primary server, and bolted out through (without opening it) the front door. More than one suffered drive failures in the main server.
This was when I worked for a company that wrote software for dentists. No SQL server, it was long ago. Still, we had disaster recovery in mind and taught the procedures. It's not the tools or technology. It's the mind set of the people using the tools and technologies. Your stuff will fail. What do you do when it happens? I'll give people a break though. Preparing for end of the world scenarios should not be high on the list. Atomic war or the end of the Mayan calendar (I think that they just ran out of paper) will cause you to spend too much resources and make the management look at you as a nut case.
Fire, flood, sabotage. Those sort of things you have to prepare for. You have a plan to get your people out, right? People first, data second. Well I can't run back into a flooded building and START a backup. I'll have to rely on my off-site.
He said, "All three accelerometers in the rocket sled CAN"T have been installed backwards!" right before they introduced him to Sergent Murphy.