code: def transfer(self, name, cache_key=None):
          
          if cache_key is None:
              cache_key = self.get_cache_key(name)
          return self.task.delay(name, cache_key,
                                 self.local_path, self.remote_path,
                                 self.local_options, self.remote_options)
docs: Transfers the file with the given name to the remote storage
          backend by queuing the task.
  
          :param name: file name
          :type name: str
          :param cache_key: the cache key to set after a successful task run
          :type cache_key: str
          :rtype: task result