docs: def backup_file(*, file, host):
      """
      Perform backup action on set driver
  
      :param file: Name of the file to be used by the driver
      :param host: Corresponding host name associated with file
      """
      if _driver:
          log.msg_debug("[{driver}] Backing up file '{file}'"
                        .format(driver=_driver.get_name(), file=file))
          _driver.backup_file(file=file, host=host)