How to use the odrive.configuration.backup_config function in odrive

# load hex file
    # TODO: Either use the elf format or pack a custom format with a manifest.
    # This way we can for instance verify the target board version and only
    # have to publish one file for every board (instead of elf AND hex files).
    hexfile = IntelHex(firmware.get_as_hex())

    logger.debug("Contiguous segments in hex file:")
    for start, end in hexfile.segments():
        logger.debug(" {:08X} to {:08X}".format(start, end - 1))

    # Back up configuration
    if dfudev is None:
        did_backup_config = device.user_config_loaded if hasattr(device, 'user_config_loaded') else False
        if did_backup_config:
            odrive.configuration.backup_config(device, None, logger)
    elif not odrive.utils.yes_no_prompt("The configuration cannot be backed up because the device is already in DFU mode. The configuration may be lost after updating. Do you want to continue anyway?", True):
        raise OperationAbortedException()

    # Put the device into DFU mode if it's not already in DFU mode
    if dfudev is None:
        find_odrive_cancellation_token = Event(cancellation_token)
        put_into_dfu_mode(device, find_odrive_cancellation_token)
        stm_device = find_device_in_dfu_mode(serial_number, cancellation_token)
        find_odrive_cancellation_token.set()
        dfudev = DfuDevice(stm_device)

    logger.debug("Sectors on device: ")
    for sector in dfudev.sectors:
        logger.debug(" {:08X} to {:08X} ({})".format(
            sector['addr'],
            sector['addr'] + sector['len'] - 1,