%LOCALAPPDATA%\BusSimulator18\Saved\SaveGames\ .
For Steam users, ensure Steam Cloud is enabled in the game's properties to automatically sync your progress. Using a 100% Save Game File bus simulator 18 save game
/steamapps/compatdata/515180/pfx/ .
Bus Simulator 18 stores its save data locally on your computer. Depending on your version (Steam or Standard Windows), the location varies: %LOCALAPPDATA%\BusSimulator18\Saved\SaveGames\