For a long time, I used Syncthing for my Joplin notes. It was running as a Docker image on my TrueNAS server. The notes themselves were on the TrueNAS server, and from there, Syncthing would sync it to my PC and laptop, for example.
I am annoyed, however, at some desyncing issues. Have you guys got ideas on how to better solve this?
If you’re hosting nextcloud anyway you might also want to check out the notes app. It creates a
Notesfolder in your account from which you can edit the markdown files, has a nice markdown editor in the nextcloud web UI, and comes with Android and iOS clients so you don’t have to setup file access and find a separate markdown editor.