It's "cloud backup" rather than cloud save really, a minor distinction, but basically if you want to multi-box then you need to manually sync your saves. So when you're done playing on box 1, go to the cloud save area and hit the sync button (refresh symbol.) This will bring the cloud up to date with box 1's save. Then, go to box 2 and hit the sync button, you'll get a cloud conflict and can choose to load box 2's save over box 1's and continue playing.
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It's my dream! I really don't wanna think about cash, but i have to for now.. Thank you! It's very motivating ❤