Only Xbox One X Owners Will Download 4K Game Patches

So when you buy the new One X, do you have to start the game all over again from Xbox One? I am playing the Horizon 3 right now and I am trying to figure out how to transfer the Game Saves Data to the new Xbox One X. If there is not a way, I will not buy the One X.
No put all your games on a portable hdd then plug into the XB1X and you should playing from where you left off.
 
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