I have the identical problem. Backups to all locations other than Dropbox work fine. Backups to Dropbox fail immediately and give a “Backup Failed at [Time]/ Error backing up database” error message. See attached screenshot.
Roon is authorized and created a RoonBackups folder in Dropbox, but backups (both scheduled and forced) always fail immediately and give the same error message.
Any guidance would be greatly appreciated
Setup is as follows:
Mac Mini MacOS 10.15.5. (headless; Dropbox not installed locally)
Roon 1.7 build 571
Music stored on Synology NAS connected via ethernet
Full Disk Access granted to Roon on Mac