Depending on your need, you could also make do with Syncthing and multiple devices. It’s mostly set up and forget. But that’s if only having multiple copies is the point. If you have two way sync setup, it will of course delete if you delete in either place. If you don’t want that to happen, you can just do one way sync. It offers quite a bit of control in what happens.

If you can host, nextcloud for sure. Comes with so many other things that it becomes a pretty cool thing. Don’t have to pay more and more to get “features”. Nextcloud has way more features than any one person will ever need.