I tried Syncthing, then I tried Nextcloud, and for the goal of just syncing camera roll and backing up my password manager, they were both a bit of a hassle.

Now I use Minio with FolderSync (Android App, I use the paid one, but the free is perfectly capable) to backup my camera roll and I wrote a very simply WebDAV server in Go to backup my (Android) password manager DB which only supports WebDAV, I sit NGINX in front of them both to terminate TLS and to handle basic auth for the WebDAV server, though I could easily implement basic auth in that too (again, my password manager only supports basic auth).

If someone can suggest a better password manager for Android with a good UI, good integration (e.g. auto-fill), has a Linux desktop app and can backup to WebDAV or Minio I'd jump in a heartbeat.

I considered Bitwarden, but I don't want to run the Mono/Windows server container, and I don't want to rely on the Rust port which is behind in features and is susceptible to the upstream breaking APIs.