Always backup C:\Users%USERNAME%\AppData\Local\Packages\Microsoft.FlightSimulator_8wekyb3d8bbwe\SystemAppData\wgs\ folder (for MS Store version)
This folder with subfolders contain all informations about you SIM.
- Controller profiles
- Sim settings (with window position and location, everything)
- Your logbook
- Your achievments
- Your progress
If something gonna wrong - you can recover to last state.