ZTE ZXV10 W300 modem router - How to Backup and Restore modem configuration - English

Hi
How to Backup and Restore ZTE ZXV10 W300 modem configuration in less than 3 minutes.
Why you need to backup your modem router configuration?
"The Backup Settings option allows you to save a file containing all your modem router's configuration settings, like wireless settings, port forwarding, WAN setup, DNS, All passwords, wireless shared key etc. to a file on your computer. This file can then be used to restore your settings if the router is reset to the Factory Default settings."