How Backup Your Android using ADB!
Download "Minimal ADB and Fastboot" on your PC
Enable USB Debugging on your Android Smartphone(Developer mode should be turned on for this)
Connect Your Android Device with your PC using USB cable
Open Command Prompt or Terminal and type "ADB devices" just to check your device is connected with your PC succesfully or not!
Then type "adb backup -apk -shared -all -f <filepath>/backup.ab", filepath- Copy the path where you want to store your Backup!
New Window may pop up on your android, tap on Backup My Data also you can encrypt your data by entering your password.
To Restore Backup:-
Same above process till 2nd point after it just type "adb restore <filepath>/backup.ab"
Thats it you restored your data succesfully!