Office 365 gets backed up by Microsoft, but their security is part of a shared responsibility model. That is to say, their data centers are physically safe. They have data storage and retrieval in duplicate. While there are some compelling reasons to back up data in Office 365, most businesses do not need it.
End-users and administrators of Office 365 should not back up their mailbox files in the majority of cases. Users assume that their data in the cloud is secure. Backups of Office 365 emails and other files, on the other hand, are a good idea. The built-in feature of Office 365 allows you to back up to PST files. A few Office 365 Backup applications even have the ability to backup Office 365 data backup.
Using the Content Search eDiscovery tool, Office 365 administrators can backup mailboxes. It does, however, include a detailed knowledge of Office 365 and the Exchange admin center. If you're a computer geek, you can use this application to export Office 365 mailboxes to PST. But to simplify the backup process, it is better to use an automated third-party tool.
Shoviv's Office 365 Backup tool is an ideal tool for taking Office 365 data backup to PST file format. The software is advanced in terms of speed and user-friendly features. There are two options available to backup data such as incremental backup and scheduled periodic backup. Through this tool, users can create and run several jobs at the same time, as well as produce a comprehensive report.
A trial version of the tool is available to test its functionality and using the demo version, the user can backup/restore the first 50 items/ folder.
For more info - Office 365 Data Backup
Veeam® Backup for Microsoft Office 365 eliminates the risk of losing access and control over your Office 365 data including Exchange Online, SharePoint Online, OneDrive for Business and Microsoft Teams – so that your data is always protected and accessible.