Veeam Backup Account Permissions
When you add Microsoft Office 365 organization using either modern authentication method with legacy protocols allowed or basic authentication, you use Veeam Backup account. Also you use Veeam Backup account for on-premises Microsoft Exchange and on-premises Microsoft SharePoint organizations.
To provide Veeam Backup for Microsoft Office 365 with the ability to work with Microsoft Exchange organizations, Microsoft SharePoint and OneDrive for Business organizations, and protect Microsoft Teams data, you must grant the following permissions to the Veeam Backup account:
Roles and permissions required to work with Microsoft Exchange organizations.
Roles and permissions required to work with Microsoft SharePoint and OneDrive for Business organizations.
Roles and permissions required to protect Microsoft Teams data.