When you add Microsoft Office 365 organization using either basic authentication or modern authentication with legacy protocols allowed, you can configure auxiliary backup accounts to minimize throttling when backing up Microsoft SharePoint and OneDrive for Business data.
To configure backup accounts, you use Microsoft Office 365 user accounts. You do not need to grant them any permissions or assign roles to them. Veeam Backup for Microsoft Office 365 automatically assigns the required roles to configured backup accounts.
For Microsoft Office 365 organizations added using modern app-only authentication, you use backup applications instead. For more information, see Backup Applications.
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