You can go through all of the methods to do this and finish your task. Methods for creating a backup of all Gmail emails to an external hard drive Here are the different methods for downloading all of your Gmail emails with attachments to disk. There are 3 different manual methods, and if you find the manual methods quite difficult, you can end up trying the professional software. Then you will see the Print All button in the top right corner, click on it. The Save As window is displayed. Once you've saved the email on your PC, you can copy and paste it onto your external hard drive.