If you need to backup your entire Android device, including your system settings and installed apps, you can use a third-party backup tool. There are many different options available, but we recommend using Android Backup Extractor. This tool will create a full backup of your device that you can restore at any time.
To restore a Nandroid backup tap the Restore button from the home screen and choose the backup from those listed. Once you’ve selected the zip file you will see the Confirm Flash screen.
Therefore, to backup the stock ROM or system data would be urgent for them. In order to backup system data, rooting is an important way that must be done to your Android stock firmware ROM device.
Back in the fall of 2016, Cyanogen Inc. announced that it was discontinuing development and shut down the infrastructure behind the project. Since then, the developer community has kept the project alive, but under the name of LineageOS. Instead, the developer picks a popular and developer-centric device and creates a base.