Replace old Time Capsule by new Time Capsule

Dear all,

I currently have an old Time Capsule that I use for my MacBook Air and an iMac as Time Machine as well as Hard Drive to store files, accessible by WLAN.

Actually I ordered the new Time Capsule. I don't find information on "how to move my data" from the old to the new device.

Can anyone help / advice?

Best regards,

Stefan