There are some valid reasons to backup data in Microsoft Office 365, but in general, most organizations don't need to do this. Your data could become encrypted by ransomware on your desktops. Microsoft 365 doesn't provide the ability to quickly (or at all) restore data. your files finish syncing to OneDrive, they're backed up and you can access them from anywhere in Documents, Desktop, or Pictures. When you back up your Desktop folder, the items on your desktop roam with you to your other PC desktops where you're running OneDrive.

As far as I know, many Office 365 Backup and Restore tools are available on the web and it is very hard to say which is the best Office 365 Backup solution. On the other hand, I would suggest you use Shoviv microsoft office 365 backup and Restore tool because it provides a safe, fast, and reliable option to get backup of Office 365 Mailbox. This tool has an option for Scheduled Incremental backup (Periodically) and Filter backup as well. It has a free trial version as well which will help you to know how does it work and what is its features.

I recommend to use NAKIVO Backup & Replication, which allows you to back up your Exchange Online data to onsite storage. You can protect entire Exchange Online accounts with mailboxes and emails. By doing that, you enable automated backups of new mailboxes. Alternatively, you can choose individual mailboxes (along with emails and attachments) to back up. By default, Microsoft Office 365 backups are incremental after an initial full backup, copying only new items. This approach speeds up the backup process and saves disk space.

You can schedule Microsoft Office 365 backup jobs to run automatically based on your data protection policy instead of running them ad hoc. The Calendar Dashboard offers a clear overview of your backup jobs, displaying all your data protection activities, including past, current and future Microsoft Office 365 backup jobs. This allows for more informed planning of your backup activities so you can optimize backup windows, avoid job overlaps and mitigate potential network congestion.

It’s great that with the pricing model of NAKIVO Backup & Replication, you only pay for what you need. It is licensed per user at $0.75 user/month for a 3-year subscription.