Problem: Backup Settings for ext. SSD

Hi,
I have a problem and can’t find the solution…
Roon Server is running on a Synology, I wanted to make a backup to an external SSD (connected to the NAS), which worked.
But then I noticed that the disk is formatted in FAT32, so I reformatted it to ExFat and wanted to make the backup again.
However, Roon shows the first backup on this drive… I can also create new folders in Roon that exist according to Roon, but are not actually on the SSD.
I can do what I want, no new backup is created or really written to the SSD.
Is there a cache for these settings or similar?
Thank you

Are you referring to a backup of the Roon database, or of your music collection?

Roon Database…

I mean this selection → the SSD is reformatted and still these folders appear…

Supplement:
Importing a backup - before this backup attempt on an external drive - has not brought any change.
Where does Roon store this data for a drive with folders that no longer exist… ???