How do I back up my extender's configuration settings?
Log in to your extender and select Settings > Other. Click the BACKUP button to download a .cfg file containing your configuration settings. Save this file to a safe location. If you later change settings and want to restore your previous configuration, go back to Settings > Other, click BROWSE, select your backed-up .cfg file, and click RESTORE. The extender will restart with your previous settings.
From the official Netgear EX2800 WiFi Range Extender manual, page 35
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