Back when my parents were still in the land of the living, I would've been entirely comfortable believing that the odds of them failing at that would've been low enough that (odds of that failing * odds of my needing that data) would've been stupidly low - low enough I'd've accepted the risk and stopped worrying about it on the basis the likelihood of a problem at that point was significantly lower than many other at least as awful problems and I should focus on mitigating those instead.