SFTP alternative backup keeps giving error

Hi All, I keep getting the error underneath. manual upload to the backup server through SFTP works and i also can create items and delete them. Cpanel makes the validate.tmp file but cant delete it but why i dont see anything strange why it couldnt Validation for transport "nas.hizundert.nl" failed: Could not delete the file we had uploaded onto the server: Couldn't delete remote file: Permission denied Any help would be appreciated Sincerly Marvin