Fist of all you need a app, you can download this app click here

I hope you will see this video

https://youtu.be/jq5vagMldwI

step 1

download this app, this app fist view is shown

step 2

click to bottom “select”

step 3

click on Backup

step 4

selecting you need backup apps

step 5

click on skip All & check

step 6

after skip All & check new window open and click on “Close”

step 7

Your apps saved in your Phone storage you can check it go to your file manager and find backup folder and open it

step 8

backup folder in avaliable a folder name is apps and open it

step 9

open apps folder in available your backup apps