Like their offsite location in the other tower that was also destroyed? I don't mean to say you are wrong, but many times contingency plans rarely consider such devastating circumstances. Once heard a rumor that a large defense contractor had a backup plan that included flying disk drives from one coast to the other to safe guard against nuclear strikes on either coast or both by having a day old backup in the air. Do you have a plan for nuclear strikes on both coasts?
I've considered it, but it really comes down to what the business needs. Does the business need to continue to operate in the face of a nuclear winter? The government sure, but most day-day operations of a retail chain would be out the window at that point.
Taking this to another extreme, does a DR plan need to account for the earth no longer being viable? Do you need system/data backups in space?
