def _count_differences(self):
        """
        Count how many things we will be sending.
        :param local_project: LocalProject project we will send data from
        :return: LocalOnlyCounter contains counts for various items
        """
        different_items = LocalOnlyCounter(self.config.upload_bytes_per_chunk)
        different_items.walk_project(self.local_project)
        return different_items