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I upgraded about a month ago. All i did was fire up the X1, let it do it's initial setup & update, and plug in Destiny disc (didn't do the digital download - had to rebuy). Destiny has to download & update too, but all my guardians were there when it was done! All your info is saved on Bungie's servers, so you can even switch back & forth between 360 & X1 if you want.