I had 10700, 10850 and then 12600 and 12600 was much much better than even 10850, it noticeable even in windows.

But if I need only few files from backup Windows backup doesn`t provide such options.

It depends. For me 2 stoppers: can not automatically created backup in background and can not get any separate files or folders from backup.

7400 works also, but depends on motherboard. On my I was able to get 7000 but fully stable

I tried, don’t like it, it needs a lot of my attention, decided to buy unraid and spend time with my family.