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This section has content in regards of authentication of VBO against the Microsoft 365 infrastructure.

General Best Practice

Usese Modern App-only Authentication which gives you the best performance, most security and is most future proof. It provides also the easiest method to register additional worker applications for SharePoint Online backups. Only enable Legacy Protocols with Modern Authentication or even go down to Basic Authentication if you really need one of the features which are today not available via Microsoft’s Graph API (and thus not with Modern App-Only authentication).

You can use the following workflow to decide whether you really need to use anything else than Modern App-only authentication.

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