public function exportContent($id, $target) {
    $source = "{$this->path}/content/{$id}";
    if (file_exists($source)) {
      // Copy content folder if it exists
      self::copyFileTree($source, $target);
    }
    else {
      // No contnet folder, create emty dir for content.json
      self::dirReady($target);
    }
  }