how to shift data from time capsule to airport time capsule

I want to shift data from my Time Capsule 1TB - to a new Airport Time Capsule 2TB.
How do I do this?

I have started to set up the new Airport Time Capsule 2TB, but it says if I replace the existing base station the settings will automatically migrate to the new ATC. Does that mean I lose the data I want to transfer?

AirPort Time Capsule (2013)

AirPort Time Capsule (2013)

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