My plan is to remove all unwanted apps which was included OS like is 3d view xbox game and etc...
after that i will back up system and keep clean image for future use.
At first have to remove that apps and how is possible that?
If not, run the Settings app and click “Apps & features”. This lists your apps and programs and tells you how much space each is taking up. Click on a program you don't want and you may be offered the option to uninstall it.