I run a small home lab, about 30 services One day I decided to change my main disk and used the opportunity to rebuild everything from scratch and from backups. I was up in about an hour. And then I spent a week fixing this and that, ah yes I changed that too and, crap, I cannot remember why this thingie is set up this way. And some more. This is a one-man lab, with simple services, all on docker. I also work in IT.…
Modern IT practices don’t really contemplate disaster recovery. Even organisations with strict backup procedures seldom test recovery (most never at all). Everything is quickly strapped together due to teams being understaffed. Preparing infrastructure in a way such that it can easily be recreated is easily twice the effort as “just” setting it up the usual way.
I think this is an outdated view.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.