TP-LINK TD-W8961N - How to Backup and Restore modem configuration

Mediaket shows you how to Backup and Restore TP-LINK TD-W8961N 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."

300Mbps Wireless N ADSL2+ Modem Router:

• All-in-One Device: ADSL2+ Modem, NAT Router, 4-Port Switch and Wireless N Access Point.
• Wireless N speed up to 300Mbps makes it ideal for heavy bandwidth consuming or interruption sensitive applications like online gaming, Internet calls and even the HD video streaming.
• Easy Setup Assistant with multi-language support provides quick & hassle-free installation.
• Easy one-touch wireless security encryption with the ‘WPS’ button and easy Wi-Fi On/Off button.