public function deleteBackup($backupName)
    {
        Service::$log->msg('Filesystem: deleting backup ' . $backupName);
        $destinationFile = $this->storagePath . $backupName;

        if (file_exists($destinationFile)) {
            unlink($destinationFile);
        }

        Service::$log->msg('Filesystem: backup deleted ' . $backupName);
    }