I will be recovering the database from a backup. Is there anything I might lose when doing this, for example bookmarks, play history (I have a bookmark for tracks I’ve not played in a year), or is everything in the database / on Roons servers ?
If you have a working backup of the Roon database, created with Roon‘s built-in backup feature, this backup contains your complete Roon database (bookmarks, tags, playlists and everything) and server configuration. Restoring this will not lose anything.
Note: you don’t really have to do a complete reinstall.