Virtualserver backup fails on Virtualmin 6.2

I setup a new CENTOS 7.4 and I can backup mysql sql files. But i can not backup domains or virtual servers. I have done the schedule backup exactly as per other server o centos 6.9 with same ver of virtualmin and that works but this new one is giving errors. It only saves one file virtualmin.tar.gz of small size but there is nothing else.

tarting backup of 5 domains to local file /backdrive/domainback .. Creating backup for virtual server .. Copying virtual server configuration .. .. done

Backing up Cron jobs ..
.. none defined.

Copying records in DNS domain ..
.. done

Saving mail aliases ..
.. done

Saving mail and FTP users ..
.. done

Backing up mail and FTP user Cron jobs ..
.. none to backup

Copying Apache virtual host configuration ..
.. done

Copying SSL Apache virtual host configuration and certificate ..
.. done

Copying Logrotate configuration ..
.. done

Copying ProFTPD virtual server configuration ..
.. no ProFTPD virtual server found!


    Saving Virtualmin configuration ..
    .. done

    Saving templates and plans ..
    .. done

    Saving DKIM settings ..
    .. not installed

    Saving greylisting settings ..
    .. not installed

    Save mail rate limiting configuration ..
    .. not installed

    Saving mail server configuration ..
    .. done

.. done

Backup failed! See the progress output above for the reason why.