Through Microsoft API, we back up OneDrive Data provided the account has an Exchange license and OneDrive license on the M365 end.
If the OneDrive accounts use a plan (M365 Apps for Business), then there is no Exchange License. Therefore, we cannot backup OneDrive data alone as such accounts won’t get listed in the Microsoft API response. Thus, our system receives an error while backing up emails, and the OneDrive backup is deactivated as well.
Currently, the ability to back up OneDrive alone with out email is not available.