Western Digital builds a portable hard drive style called the Passport, which looks about the size of a travel passport and connects to a computer's USB port. The Passport comes in multiple different sizes, all of which are highly capable of backing up large amounts of files.
Plug the WD Passport into the computer's USB port.
Open the WD Passport's folder. Click "View Folder of All Files" inside the Autoplay box that appears when the Passport is plugged into the computer.
Open the folder containing files that you want to back up.
Hold down the "Control" key on the keyboard. While holding down the key, left-click the files that you want to back up.
Copy the files by right-clicking a selected file and click "Copy."
Right-click a white portion of the Passport folder and click "Paste." The files will be copied onto the Passport.