checked the machine, there is indeed 1 Duplicati-server.sqlite in the .config folder
the library folder only contains a folder with updates, no sqlite
downloaded the dmg file and installed it
rebooted, tried to access the url, that wasn’t working as you need to open it using the tray icon.
that wasn’t there, so started duplicati manually, then macos did its magic for downloaded applications, but still no tray icon
rebooted again, and there it was a nice tray icon
needed to set the mandatory passphrase
and there the old database was, waiting for the next backup
ran a backup, everything went fine
still not sure why i had 2 databases then, i do try canary versions on that machine, but i am only going up in version
a nice tray icon