It’s easy to move your files and settings from another Mac or PC to your iMac. You can transfer information to your iMac from an old computer—or from a Time Machine backup on a USB storage device—either wirelessly, or with an Ethernet cable and adapters.
Tip: For best results, make sure your iMac is running the latest version of macOS. Open or Thunderbolt 3 (USB-C) port How to move your content to a new Mac.