Nextcloud has a recipe add-on “cookbook” which is pretty good, works for me.

As far as I know it’s a known limitation. Joplin just does not have background sync. It’s ok for my use case but the initial sync can take a long time depending on your database size. Other than that, I’m happy with Joplin.

That’s not a bad idea actually. The Powerdelete script I used is based on Javascript and needs to be started manually in the browser window, I’ll just run the script once a day. But maybe someone with more knowledge can come up with a more automated solution. They can’t restore user accounts forever.