code: def check_for_usable_restore_env(self):
          
          self.check_for_usable_environment()
  
          if not os.path.isdir(self.mackup_folder):
              utils.error("Unable to find the Mackup folder: {}\n"
                          "You might want to back up some files or get your"
                          " storage directory synced first."
                          .format(self.mackup_folder))
docs: Check if the current env can be used to restore files.