Before major patches, we always advise making a backup of your current game settings.
The best way to do this is by copying the Frontier Developments folder and storing it in a safe location. We also advise renaming the folder so that it is clear that it is a backup.
You can duplicate this folder by holding down the "Ctrl" key and dragging the folder to the same directory or a specific back up location.
You can locate the Frontier Developments folder here: C:\Users\%USERNAME%\AppData\Local\
Just drop the location link into your file explorer's search bar as shown below. "%USERNAME%" is a wildcard to account for usernames not being the same.
The AppData folder is hidden by default so you may need toggle the 'View Hidden' option in your Username folder first.