Gears 5 Save Game Location
Windows
Gears 5 save games can be found on Windows here:
C:\Users\[user_name]\AppData\Local\Packages\Microsoft.HalifaxBaseGame_8wekyb3d8bbwe\SystemAppData\wgs\[user_id]
Linux
Gears 5 save games can be found on Linux (Proton) here:
~/.steam/steam/userdata/[user_id]/1097840