There’s a lot of Unreal devs that today consider Game Instance a part of the Game Mode group, or at least work that way, joining them while building a project.
So to avoid the need some feel to call multiple nodes and end up fighting against lifecycle of a save thread, I will in a future update add this option to the Save Game Mode and Load Game Mode nodes:
Save/Load GM with Game Instance
This way when you launch a background task you can save both without launching yet another thread just to save a Game Instance blueprint.