If you need to backup G Suite emails in Outlook PST, I refer to the Mailvita G Suite backup for Mac Software. It backup single and unlimited emails from Gmail to PST or other file formats like MBOX, EML, MSG, HTML, etc. The software saves the emails with attachments from Gmail to the local system which maintains the valuable database files. Users can use it without needing any technical expertise. It supports email clients as well as Windows OS and MS Outlook versions. It has an easy and simple interface to easily export emails from Gmail without effort. Dwonload and use the free demo version to examine the utility.