/**
  * Builds the configured DFSBackend handler
  * @return eZDFSFileHandlerDFSBackendInterface
  */
 public static function build()
 {
     if (!isset(self::$instance)) {
         self::$instance = self::buildHandler(eZINI::instance('file.ini')->variable('eZDFSClusteringSettings', 'DFSBackend'));
     }
     return self::$instance;
 }