How do I back up and restore my AC750 Range Extender settings?

To back up: log in to the extender, go to Settings > Other, and click the BACKUP button. Your browser will download a .cfg configuration file to save. To restore: go to Settings > Other, click BROWSE to locate your previously saved .cfg file, click RESTORE, and confirm your decision. The extender will restart (about one minute). Do not interrupt this process or go online during restoration.