These databases are stored in Azure SQL, which has an extensive business continuity plan. SharePoint metadata is also critical to accessing user content as it stores the location of and access keys to the content stored in Azure Storage. For performance reasons the storage container in the same local datacenter is always preferred, however, read requests that don't see results within a desired threshold will have the same content requested from the remote datacenter to ensure data is always available. ![]() SharePoint environments in either datacenter can access storage containers in both Azure regions. ![]() Since version integrity protection is built into SharePoint's architecture, previous versions of the file contents can be retrieved, depending on individual administrator settings. This process ensures that files can't be changed or corrupted after an initial save, protecting against attackers that try to corrupt old versions. This means that Microsoft can only add new blobs and can never change old ones until they're permanently deleted. See the Azure Storage redundancy article for details. Within each region, Azure Locally Redundant Storage (LRS) provides a high level of reliability. ![]() This same technique is used in all workflows to prevent propagation of any corruption that should occur. After the contents are written into Azure Storage, checksums are stored separately with metadata, and are used to ensure that the committed write is identical to the original file sent to SharePoint during all future reads. If writes to either Azure region fail, the file save will fail. Every file is simultaneously written into both a primary and a secondary datacenter region. SharePoint has a custom-built solution for storage of customer data in Azure Storage. The complete set of controls to ensure data resiliency is explained in further sections. SharePoint has built a custom resiliency plan on top of Azure Storage to ensure near real-time duplication of user content and a truly active/active system. Blob storage: User content that is uploaded into SharePoint is stored in Azure Storage.Azure SQL offers a complete business continuity story that SharePoint uses and details are covered later in this article. Metadata: Metadata about each file is stored in Azure SQL Database.There are two primary assets that make up the core content storage of SharePoint: The contents of this article are relevant to Microsoft 365 and don't apply to consumer services. In this article, only SharePoint will be used to refer to both products. When the newly created AD user object is synchronized to Azure AD, Azure AD creates a new Azure AD user object instead of restoring the soft-deleted Azure AD user object.Within Microsoft 365, OneDrive is built on top of the SharePoint file platform. If Azure AD Connect Synchronization Service is configured to use system-generated AD attribute (such as ObjectGuid) for the Source Anchor attribute, the newly created AD user object will not have the same Source Anchor value as the deleted AD user object. If you do not have on-premises AD Recycle Bin feature enabled, you may be required to create an AD user object to replace the deleted object. For information about Source Anchor attribute, refer to article Azure AD Connect: Design concepts. When the recovered on-premises AD user object is synchronized to Azure AD, Azure AD will restore the corresponding soft-deleted Azure AD user object. If you have on-premises AD Recycle Bin feature enabled, you can restore the deleted on-premises AD user object without changing its Source Anchor value. By default, Azure AD keeps the deleted Azure AD user object in soft-deleted state for 30 days. If you accidentally deleted an on-premises AD user object, the corresponding Azure AD user object will be deleted in the next sync cycle. This feature helps with restoring Azure AD user objects by doing the following: To learn how to enable the Active Directory Recycle Bin feature, see Active Directory Administrative Center enhancements. For information about restoring Active Directory objects, see Scenario overview for restoring deleted Active Directory objects. If you accidentally deleted an on-premises AD user object and restore it using the feature, Azure AD restores the corresponding Azure AD user object. We recommend that you enable the Active Directory Recycle Bin feature for your on-premises instances of Active Directory (AD) that are synchronized to Azure AD.
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