I think Ente uses MinIO for storage, I could see them supporting the ability to self-host in S3 at some point

Hey, you can connect any S3 compliant service to Ente.

Our quickstart.sh[1] bundles Minio, but you can configure Ente to use RustFS[2] or Garage[3] instead.

[1]: https://ente.io/help/self-hosting/#quickstart

[2]: https://github.com/rustfs/rustfs

[3]: https://garagehq.deuxfleurs.fr/