Backup is a fundamental part of any secure configuration, it is necessary to save copy of your personal data also on external and offline support.
Also, creating OS images is a good practice and, as already suggested, Macrium is a very good choice.
With Macrium Reflect free, it's easy to make system image with it (fast, images are compressed)
And for data backup, SyncBackFree is light and full of options.
I recommend Ublock origin as an adblocker. (light and performant).
Agreed most of above gurus! Extensions: Pls consider Ublock Origin/Adquard (system wide) + HTTPS-Everywhere + Scriptsafe. About Password manager, it is not needed, if you have very good memory and pen + piece of paper. Otherwice, like keepass. Thanks,,,oh one more thing...oh well nevermind. Thanks for sharing.
ADDED :Comodo Firewall with @cruelsister settings
RE-ENABLED:Windows Defender, tweaked with GPO(Group Policy Editor)
Removed:Bitdefender Internet Security, because the bugs is annoying(New Bugs:Bitdefender Security Service is Not Reponding)