Backup Repositories

Veeam Backup for Microsoft 365 uses backup repositories as storage systems for backups and backup copies created for Microsoft 365 and on-premises Microsoft organizations. You can add to Veeam Backup for Microsoft 365 storage systems of the following types:

• JET-based backup repository
• Backup repository extended with object storage

The following table lists supported backup repositories depending on their type and purpose of usage.

For more information about backup repository structure, see Backup Repository Structure.

For more information about Azure Blob Storage and Amazon S3 object storage supported by Veeam Backup for Microsoft 365, see Supported Azure Storage Account Types and Supported Amazon S3 Storage Classes.

JET-Based Backup Repositories

Veeam Backup for Microsoft 365 uses JET-based backup repositories only to store backups created by backup jobs. To save data in storage systems of this type, Veeam Backup for Microsoft 365 uses Extensible Storage Engine (ESE) databases, also known as JET Blue.

You can add the following JET-based backup repositories to the Veeam Backup for Microsoft 365 backup infrastructure:

• A local directory on a backup proxy server.

A default backup repository is the C:\VeeamRepository directory on a computer with Veeam Backup for Microsoft 365.

• Direct Attached Storage (DAS) connected to the backup proxy server.
• Storage Area Network (SAN).

A backup proxy server must be connected to the SAN fabric using hardware, virtual HBA or software iSCSI initiator.

• Network Attached Storage (SMB shares version 3.0 or later).

Experimental support.

Extended Backup Repositories

You can extend a local JET-based backup repository with object storage. For more information on how to extend a backup repository with object storage, see Specify Object Storage.

The following table lists supported object storage that you can use to extend a local JET-based backup repository for data backup and backup copy.

For more information about object storage, see Object Storage.

If you extended a local JET-based backup repository with object storage, you can do the following:

• Back up your data directly to the supported cloud or on-premises storage system. This is not applicable to backup repositories extended with Azure Blob Storage Archive access tier and all Amazon S3 Glacier storage classes.
• Transfer your backed-up data as backup copies to such repositories. Keep in mind that if you extend a backup repository with Azure Blob Storage Archive access tier or any of Amazon S3 Glacier storage classes, you can use this backup repository only to store backup copies and select it as a target for backup copy jobs.

What Is Under Backup Repositories Node

In the Backup Infrastructure view, the Backup Repositories node includes the following nodes for different backup repositories added to Veeam Backup for Microsoft 365:

• Object storage. Contains backup repositories extended with S3 Compatible object storage, Azure Blob Storage Hot/Cool access tiers, Amazon S3 Standard and Amazon S3 Standard-Infrequent Access storage classes. Veeam Backup for Microsoft 365 uses such repositories to store both backups and backup copies.
• Local disk. Contains Default Backup Repository and other JET-based backup repositories. Veeam Backup for Microsoft 365 uses such repositories only to store backups.
• Archive. Contains backup repositories extended with Azure Blob Storage Archive access tier and all Amazon S3 Glacier storage classes. Veeam Backup for Microsoft 365 uses such repositories only to store backup copies.

Keep in mind that the Archive and Object storage nodes are displayed only if you have added a backup repository extended with a particular object storage.

In This Section

• Backup Repository Structure
• Retention Policy
• Direct Attached Storage (DAS)
• Network Attached Storage (SMB Shares)
• Adding Backup Repositories
• Editing Backup Repository Settings
• Removing Backup Repositories
• Upgrading Backup Repositories
• Synchronizing Repositories
• Invalid State