For a customer I once made these step-by-step instructions to learn how to back up your e-mails in Microsoft Outlook 2016.
Bonus – the Outlook runs in German, so don’t be surprised. The instructions are in English.
Download here
sebaf-it.com/downloads/Backing_up_E-Mails_PST-File_Microsoft_Outlook.pdf
Disclaimer
The author assumes no responsibility or liability for any errors or omissions in the content of these instructions. The information contained in this paper is provided on an “as is” basis with no guarantees of completeness, accuracy, usefulness or timeliness.