The most user friendly way to backup your macOS computer. Hook the airport time capsule up to your wifi and go through the one time setup and the device does the rest.
Apple AirPort Time Capsule 802.11ac Wireless 2TB Network Attached Storage NAS
With AirPort Time Capsule, you get a superfast Wi-Fi base station and an easy-to-use backup device all in one. And backing up your data couldn’t be simpler. Just set it up once and AirPort Time Capsule does the rest. It works with Time Machine in OS X to back-up your Mac automatically and wirelessly, so you never have to worry about losing anything important again. Every photo. Every file. Every song. Even your apps and OS X settings are saved. AirPort Time Capsule stores it all up to 2TB or 3TB of data.