public function checkCronExt( )
    {
        $result = 0;                                    // kein Cron
        $objDB = \Database::getInstance();

        if( $objDB->tableExists('tl_crontab') ) {
            $result = 1;                                // Cron vorhanden, kein Job

            $objJob = $objDB->execute("SELECT * FROM tl_crontab WHERE job='system/modules/BackupDB/public/AutoBackupDB.php' LIMIT 1");
            if( $objJob->next() ) {                     // IF( Job vorhanden )
                $result = $objJob->enabled ? 3 : 2;     //   Job AKTIV(3) oder Job INAKTIV(2)
            }
        }
        return $result;
    }