How can I backup by using iCloud backup
How can I transfer icloud data from my iPhone 6s to the iPhone 12 after setting it up
iPhone 12 Pro Max, iOS 14
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If the two devices are using the same Apple ID, the data is already available, if you’re planning on using a separate install as has been done here.
Here’s the usual migration sequence, if you wanted to transfer your existing contents over in their entirety:
Transfer data from your previous iOS device to your new iPhone, iPad, or iPod touch - Apple Support