> Modern IT practices don’t really contemplate disaster recovery. Even organisations with strict backup procedures seldom test recovery (most never at all).

I think this is an outdated view. In modern enterprises DR is often one of the most crucial (and difficult) steps in building the whole infra. You select what is crucial for you, you allocate the budget, you test it, and you plan the date of the next test.

However, I'd say it's very rare to do DR of everything. It's terribly expensive and problematic. You need to choose what's really important to you based on defined budgets.