A good way to back up important data is to save it on an external drive. This way, if the computer drive that contains your data crashes, you still have access to that information on the external drive. The same is true for emails. You can save single Outlook files, or several folders of emails, to the drive of your choice.
Saving a Single Outlook Email on an External Drive
Ensure that your external drive is plugged into your computer.
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Open the email that you want to save, and press the file tab in the top-left corner of the screen.
Press the "Save As" option. Press the "My Computer" icon on the left side of the screen. Your removable hard drive should be listed.
Double-click your removable drive. Select a folder on the removable drive, and press the "Save" button.
Saving Multiple Outlook Emails on an External Drive
Hold the "Ctrl" key down. Either press the "A" key while "Ctrl" is held down to highlight all of the emails in your inbox, or click on individual emails from the list while holding "Ctrl" to select only the emails you wish to back up.
Press the "File" tab in the top-left corner.
Select "Save As" from the list.
Press the "My Computer" icon, and then double-click your removable drive.
Choose a folder in which to save the file, and then press the "Save" button. Your emails have been saved on your external drive.