How to i backup and sync PC OS and files?

I want to set up a regular backup of my OS and rest of C drive and maybe even other drives or specific folders and files from my PC to my Truenas. Say everyday backup 7 days a week, automatically deletes the oldest.

How do i do that? And how to i retrieve the files from my nas to my pc as well, without manual copying everything myself?

Basically i want to set up a backup sync…

Search for Windows backup software and pick one that suits you. You need an additional software product on your Windows PC to do that. Veeam seems to be popular but I have no experience with it because I do not run Windows.