I’m not too sure on how Datastore2 works but if you haven’t already the creator of it provided examples and there’s a tutorial on it too: How to use DataStore2 - Data Store caching and data loss prevention
I don’t want to give you misleading info/things I’m not 100% on but I’m pretty sure, after reading the thread, you’d just call Set() and within the parameter provide your table. Save() is automatically called upon the player leaving. You also want to load the data upon the player entering the game (PlayerAdded event). Hope this helps!