There are various instances occur when Office 365 users want to backup the Office 365 mailbox data in order to safeguard the critical information contained inside. Many users prefer to export their Office 365 mailbox to PST format in this case. I have recently gone through an interesting post that outlines the complete manual process to backup Office 365 mailbox to PST format using the eDiscovery method. Although manual approaches are free, this eDiscovery method is time-consuming and needs a moderate technical understanding of Office 365 and the most recent Microsoft Purview wizard.
It is not recommended for non-technical users due to these limitations. In this respect, Office 365 Migration Tool is the ideal approach for them to backup/migrate the Office 365 mailbox. This software has certain additional capabilities that assure high data integrity and allow them to optimize the whole process. If you wish to test its performance, you can use its free demo version.