To back up Azure Blob Storage data with object storage, you need to add at least one object storage repository. To define the content of the backup, you need to configure the content groups for the object storage repositories.
To add an Azure Blob Storage object storage repository, consider the scenarios that you have and then choose an authentication method.
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If you want to back up storage containers in Azure Stack Hub storage, then use access and secret keys to add the Azure Blob Storage object storage repository.
Microsoft Entra Authentication is currently not supported for Azure Stack Hub storage. For more information, see the Microsoft documentation, Azure Stack Hub storage: Differences and considerations.