Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hi,
Thank you for posting this question in Microsoft Community. Based on the description, you would like to use the 'PST' backup tool for Outlook 2013.
Currently PST backup tool for Outlook 2013 is not available and there is no official information about availability of this add-in. You may manually backup the Outlook data.
Refer the following link for more information:
I hope this information helps you. In case you need any assistance with other Office applications, reply to us and we will be glad to assist you.
Thank you.