If you want to take the backup of Office 365 Mailbox Account then you can take help of this Regaintechnologies Office 365 Backup tool. With this Software you can easily take the backup of your Office 365 Mailbox data without any data loss risk. This software comes with simple and user-friendly interface where both technical and Non technical user can easily operate it without any technical knowledge. This software also provides free trial version where you can save 30 emails at free of cost.
Checkout this software free trial version here: https://www.regaintechnologies.com/office365-backup.html