Norton backup builds huge files, 62 GB on my PC, I have heard of others with over 700 GB. Delete them and it will repopulate in a few days. Security with Win 10 is very good so I uninstalled Norton. Problem is that Norton is it's own virus, it cannot be removed by just an uninstall it is buried so deep. You will get a pop us telling you to reinstall it, only way to get rid of the popup is to go into task manager and close it out. I did that and removed the Norton program and folder that was causing the popup. No dice, it finds a way to keep popping up. How can Xfinity agree to let Norton install a virus on the very machine it is supposed to protect? Shame on Xfinity. They should pressure Norton to allow a clean, easy uninstall.