How to roll back from High Sierra to Sierra and save data (settings, documents, programs)?

Question

Backup

Hello! There is MBP 2011 on high sierra.
The video chip died, and there was a need to roll back to Sierra to restore performance.
How to roll back to the Sierra correctly, and at the same time transfer the settings , documents , and programs as correctly as possible . First of all, they are concerned about programs and settings, as documents are in the clouds.
There are no Sierra backups, there is a second hard drive inside + backup in Acronis True Image. Still have a laptop on Windows.
I would love any experience!
UPD. The Mac works, I write from it. I can save whatever and whatever)

Answer 1

You should somehow revive the video chip in the sc.
Then make backups in time machine. to the outer screw.
And then you already know.