Information
Veeam Backup for Microsoft 365 v8 and higher
Due to Microsoft's deprecation of Basic Authentication, the only option available when adding a new Microsoft 365 organization to Veeam Backup for Microsoft 365 v8 is Modern App-Only Authentication.
Veeam Backup for Microsoft 365 v7 and v7a
When adding a Microsoft 365 organization with Modern Authentication to Veeam Backup for Microsoft 365, there is an option to enable "Allow for using legacy authentication protocols." When this checkbox is not selected, Veeam Backup for Microsoft 365 will use a mode referred to as Modern App-Only Authentication.
Due to Microsoft's deprecation of Basic Authentication, all organizations must be added to Veeam Backup for Microsoft 365 using Modern App-Only Authentication. For more information review: KB4365: Support Statement - Exchange Online Basic Authentication Deprecation
Modern App-Only Authentication Limitations
Veeam Backup for Microsoft 365 v8 and higher
Backup
SharePoint Web Parts can only be backed up if their ‘exportmode’ property is enabled. Non-exportable Web Parts are not supported. To prevent issues processing WebParts, review and implement the solution documented in KB4091.
Dynamic Distribution Groups are not supported for Microsoft 365 organizations.
Restore
OneNote restore is not supported.
SharePoint Web Part customized template cannot be preserved upon a restore. All Web Parts will be restored with the default template.
The ‘Allow multiple responses’ setting in survey lists within team modern sites is not preserved upon a restore.
PowerShell
The ‘Measure-VBOOrganizationFullBackupSize’ cmdlet is not supported.
More Information
For a complete list of considerations and known limitations of Veeam Backup for Microsoft 365, review: Considerations and Limitations
