Outlook backup takes a copy of your emails and stores them in a secure location like cloud storage. This will become handy to restore your emails along with the label and other important data whenever there is a loss.  

How to Back Up Your Emails Data:

1- Open Outlook and select File then select Open & Export then open Import/Export.

2- Select Export to a file, and then select Next.

3- Select Outlook Data File (.pst), and select Next.

4- Select the mail folder you want to back up and select Next.

5- Choose a location and name for your backup file, and then select Finish.