If you want to export your Gmail emails to PST then you can perform this task with the help of the manual or a professional software approach. In this regard, I have recently gone through an informative write-up that explains the detailed manual as well as a direct software approach to export Gmail emails to PST. If you want to perform this task manually, then you need to execute the following steps:

1. Enable IMAP in your Gmail account.
2. Configure Gmail account with MS Outlook.
3. Export Gmail emails to PST. 

The detailed procedure is well explained in this article. However, this approach has some limitations that make this approach quite complex for non-technical users. Therefore, experts have always recommended opting for a professional software approach that includes a Gmail Backup Software. This software is a reliable and trustworthy solution to backup all the Gmail data including, emails, Calendars, Contacts, drives, etc. You can also try its free trial version that will allow you to examine its advanced functionalities.