public static void SaveExternal(string saveName = "SaveData")
{
string fileName = $"{saveName}.bin";
instance.SaveAllDataInternal();
Debug.Log("Writing persisient data to File.");
FileStream stream = File.Open(Application.persistentDataPath + "/" + fileName, FileMode.OpenOrCreate);
var formatter = new BinaryFormatter();
formatter.Serialize(stream, instance.m_Store);
stream.Close();
}