@classmethod
def parse_args(cls, subparsers):
    """Create the `files` subparser for the `backup` command.
        :param subparsers: Main argument parser
        """
    fs_parser = subparsers.add_parser(cls.command, description=cls.__doc__)
    fs_parser.add_argument('-o', '--output', required=True, help=
        'output gzipped file path')
