/**
  * Returns an array containing the full path to each dump file.
  * 
  * @return array
  */
 private function dumpFiles()
 {
     $files = [];
     foreach (File::allFiles(Config::dumpPath()) as $dumpFile) {
         $files[] = $dumpFile->getRealpath();
     }
     sort($files);
     return $files;
 }