First, connect your iOS device (iPhone/iPad) to the computer via data cable;
Second, after your iOS device is connected to the computer, open the iTunes tool, and then click on the device icon to manage the home page of iTunes device, and then click on "Backup Now" on the interface. After that, click "Backup Now" on the interface. After clicking "Backup Now", the iTunes tool will automatically backup the device data, and you can see the backup entry on the upper part of the tool;
Fourth, when the backup is completed, you can see the "Backup" interface in the middle of the iTunes interface. "The latest backup" time and other information.