My day-to-day stuff stays in sync via syncthing on my two laptops, my desktop and my home server. They all run btrfs, so I won’t be syncing any flipped bits around.

Home server rsyncs from my VPS once a week. When that’s fine, it rsyncs itself over to a hetzner storage over sshfs+gocryptfs.

Four copies at home, one in the cloud.