Exactly my approach!
So when I plug it in it copies/syncs the things on my computer, anyone knows somethign like that?
So you want to sync files from a drive whenever you plug it in to the computer? Sounds like a udev + rsync solution. Udev mounts the drive and runs rsync.
Rootless LXC containers, TLS. In my case, I have both VPS and my own hardware, so every sensitive data is hosted on the hardware only.
It's very small on my disk. It doesn't have systemd. It uses musl, which is considerably easier to configure than GLibc. It has a fast and easy to use package manager. It has both stable and rolling releases for packages. Easy to write your own packages and build them from source. Easy to contribute to upstream.
If you're already self-hosting:
Document your setup. Write guides. Make it easier for the next person.
Heck yeah! This is exactly what I'm trying to do: https://codeberg.org/lch361/infrastructure.lch361.net (in the future I'm planning to move all code to a self-hosted Forgejo service, especially when it'll implement federation). Infrastructure as code, performance metrics, automation - it's all there. It's not just a matter of self-hosting and privacy anymore. It's an effort to make the engineering behind that more approachable.