The save file is often buried within the "WindowsApps" folder. This folder is system-protected, meaning you might get "Access Denied" errors even if you are the Administrator.
%localappdata%\BANDAI NAMCO Entertainment\DB Xenoverse 2\DBXV2.sav
This is your actual save data. It is usually a small file (around 2MB to 5MB depending on your progress).