Edit: on top of that I've built a custom one-page monitoring dashboard, so I see everything in one place (https://imgur.com/B3hppIW) - I'll opensource, it's decent architecture, I just need to cleanup some secrets from Git history...
For stuff I care about (mostly photos), I back them up on two different services. I don't have TBs of those, so it's not very expensive. My personal code I store on git repositories anyway (like SourceHut or Codeberg or sometimes GitHub).