A backup is very important. We recommend that you never send coins to the device before you have made a backup. A backup should be made once and should be kept in a safe place. It gives you access to your tokens even if the device breaks down.
Click on 'Create a backup in 3 minutes' on your computer. Once you have read the text you can confirm that you understand how to save the backup. Click on 'Continue'. Then confirm on your Trezor by clicking on 'I understand'.
Your Trezor now shows 12 words. Write these correctly and in the right order on the paper provided. Then press and hold the green button to confirm.
The Trezor will now ask you to re-enter two words to check if they have been written correctly.