apple tv
replacing my old apple tv with new 4k box do I need to backup or just plug in
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How old is the old Apple TV? Which model? Identify your Apple TV model - Apple Support
You can sync apps through iCloud if both are 4th generation or later. With earlier model, there is nothing to sync. First activate One Home Screen on the old, then set up the new one.
One Home Screen - Keep apps and the Home Screen up to date across multiple Apple TVs - Apple Support