Issue Plesk Backup data always goes to FTP

[tho]

Plesk stil pushes backup data to FTP even though the respective setting ( Use FTP storage ) is unchecked.

Until recently I used an FTP server for backup storage.

But now I want to store backups in a mounted path.

I changed the following in /etc/psa/psa.conf:
# Backups directory
DUMP_D /mnt/s3/dumps

Plesk stores backups there AND on the FTP server.

What do I need to do to really disable plesk FTP access?

Thanks in advance!