Root as a default or GUI-selectable option The plans are running under the account that was used to create them. You can call that a security measure. You can always change plan owner to root via this command:
sudo chown root:wheel /opt/local/CloudBerry\ Backup/plans/*
If that doesn't help check what the actual permissions on the files:
ls -la $target_folder_with_permission_denied_files
Pay attention to the user-group-other and owner settings.
It might be that the files were denied to access by our Backup user and you may need to allow our Backup to read those files.
To do so, run chmod +r $target_folder_with_permission_denied_files/*