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Office 365 data are within Microsoft datacenters protects your data from hardware and software failures on Microsoft's side. What if data is accidentally deleted by you or someone tries to delete data without your knowledge forcefully. Or your account hacked, MS Office 365 data datacenter cannot able to help you to restore deleted files and emails, which is discovered after 30+ days or after the site trash bins have been emptied.
I use SysTools Office 365 Backup one of the tools to backup and restore my office exchange online data one of the tools in my own O365 tenant. This software helps me to archive and export Exchange online data as a PST & EML file to local machine.
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Kernel Office 365 Backup & Restore, a secure and the most effective third party software, allows its user to take backup of multiple mailboxes from Office 365 to PST by using CSV files. The software also provides log reports after the backup procedure.
The software is compatible with all Office 365 editions. Its free trial version is also available to download at- www.nucleustechnologies.com/.../
You can try Office 365 backup as well for more detailed documentation check here for Microsoft office 365 migration and backup Tool