def METHOD_NAME(self):
    # save the real user file to be able to do whatever we like
    filename = os.path.join(conffile.CONF_PATH, self.conf_class.file_name)
    backname = filename + u".testbak"
    if os.path.exists(filename):
        logging.info("Saving file %s", filename)
        shutil.copy2(filename, backname)
        self.backname = backname
    else:
        self.backname = None
    self.filename = filename