code: def snapshot(self, file_obj):
          
          snapshot_request = etcdrpc.SnapshotRequest()
          snapshot_response = self.maintenancestub.Snapshot(
              snapshot_request,
              self.timeout,
              credentials=self.call_credentials,
              metadata=self.metadata
          )
  
          for response in snapshot_response:
              file_obj.write(response.blob)
docs: Take a snapshot of the database.
  
          :param file_obj: A file-like object to write the database contents in.