Overconfidence. We somehow cling to this absurd notion that we're capable enough to perform an emergency recovery if necessary. Never mind that we've already experienced the difficulty of losing data one way or another, the delusion yet persists.

I just wish affordable tape drives never disappeared.

Then use cryptomator. https://cryptomator.org/

Can confirm. I have a server in my basement with 10TB+ of storage, sitting mostly empty, and I still don't have backups configured. Screwing with servers is fun and interesting, but configuring backups isn't.