If you like to save your own running configuration to the "system default" configuration you can follow the following steps. This will upon a reset of the device come up with your own predefined configuration. Sometimes also referred to as the ROM-D file.
Connect via SSH to VMG-Device:
Use the following command:
zycli save_default save
Now your configuration is save as default Configuration, this means if you now reset the VMG your own configuration will be use.