I choose not to think about it or include it in my mental threat model, the same way I choose to not worry about thermonuclear warheads.

If there’s some exploitable backdoor and Intel gets owned, we’re all boned and there’s nothing we can really do about it. I don’t have anti-ballistic-missile systems, and I also don’t have the capability to make an entire hardware/firmware/os from scratch.

So instead focus on the things you can control and are more likely to happen. Don’t plan for doomsday, plan for every day.

Right? I’ve been using NextCloud/OwnCloud since ~2015. It’s a very standard LAMP app, nothing fancy going on at all. Give it enough memory and you’ll never have any problems, same as any other web service.