When one is changing Roon cores - in this case going from a Nucleus to the internal core function on a Grimm MU1, does one retain all of the playlists that have been previously created via the process of log-in credentials from one core to the next?
@Marc_Mable2, if you have a recent database backup of Roon created from within Roon’s Settings → Backups tab, all of your changes and additions to your Roon database, including playlists, will transfer to the new computer that will become your Roon Server.
Roon has a number of FAQs and guides for transferring your Roon database and music library (if the music library also is transferred) to a new computer: