D-Link DSL-2640B - Manual (Page 70)

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When completed, the below pop-up window will appear confirming that the router
has been rebooted.
Backup Settings
To save your configurations in a file on your computer so that it may be accessed
again later if your current settings are changed, click on the Backup Settings
button. The below pop-up screen will appear with a prompt to open or save the file
to your computer.