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Veeam Backup & Replication 9.5 Update 4
User Guide for VMware vSphere

HPE StoreOnce

You can use HPE StoreOnce storage appliances as backup repositories.

To work with HPE StoreOnce, Veeam Backup & Replication leverages the HPE StoreOnce Catalyst technology and two HPE StoreOnce components:

  • HPE StoreOnce Catalyst agent. The HPE StoreOnce Catalyst agent is a component of the HPE StoreOnce Catalyst software. The HPE StoreOnce Catalyst agent is embedded into the Veeam Data Mover Service setup. When you add a Microsoft Windows server to the backup infrastructure, the HPE StoreOnce Catalyst agent is automatically installed on the added server together with the Data Mover Service.
  • HPE StoreOnce appliance. The HPE StoreOnce appliance is an HPE StoreOnce storage system on which Catalyst stores are created.

HPE StoreOnce Deployment

To communicate with HPE StoreOnce, Veeam Backup & Replication uses two Data Mover Services that are responsible for data processing and transfer:

  • Veeam Data Mover on the backup proxy
  • Veeam Data Mover on the gateway server

The HPE StoreOnce storage cannot host Veeam Data Mover Service. For this reason, to communicate with the HPE StoreOnce storage, you need to deploy a gateway server. Veeam Backup & Replication will automatically deploy a Veeam Data Mover on this gateway server. For more information, see Gateway Server. For communicating with the HPE StoreOnce storage appliances, the gateway server must run a 64-bit Microsoft Windows version.

When any job addresses the backup repository, the Data Mover Service on the gateway server establishes a connection with the Data Mover Service on the backup proxy, enabling efficient data transfer over LAN or WAN.

HPE StoreOnce 

The gateway server is selected when you assign a backup repository role to the HPE StoreOnce appliance. You can define the gateway server explicitly or instruct Veeam Backup & Replication to select it automatically.


HPE StoreOnce Tip:

For work with HPE StoreOnce, Veeam Backup & Replication uses the Catalyst agent installed on the gateway server. If you want to reduce the load on the network between the source and target side, assign the gateway server role to a machine on the source side, closer to the backup proxy.

Limitations for HPE StoreOnce

If you plan to use HPE StoreOnce as a backup repository, mind the following limitations. Limitations apply only if you use HPE StoreOnce in the integration mode, not the shared folder mode.

  • When you create a backup job targeted at HPE StoreOnce, Veeam Backup & Replication will offer you to switch to optimized job settings and use the 4 MB size of data block for VM data processing. It is recommended that you use optimized job settings. Large data blocks produce a smaller metadata table that requires less memory and CPU resources to process.
  • The HPE StoreOnce backup repository always works in the Use per-VM backup files mode. For more information, see Per-VM Backup Files.
  • HPE StoreOnce does not support the reverse incremental backup method.
  • HPE StoreOnce does not support the forever forward incremental backup method. When creating a backup job, you must enable synthetic and/or active full backups. Otherwise, you will not be able to create a backup job.
  • The HPE StoreOnce backup repository does not support the Defragment and compact full backup file option (for backup and backup copy jobs).
  • You cannot use HPE StoreOnce backup repositories as sources or targets for file copy jobs.
  • You cannot copy backup files (VBK, VIB and VRB) manually to the HPE StoreOnce backup repository. To copy such files, use backup copy jobs.
  • You cannot use the HPE StoreOnce backup repository as a cloud repository.


Maximum number of restore points per backup chain


VSA Gen3


VSA Gen4

7 to 14 (for version 4.1.1 varies depending on the amount of available memory)

Proliant Gen7


14 (per node)

Proliant Gen8












28 (per node)

Proliant Gen9










42 (per node)

Proliant Gen10











Several Backup Repositories on HPE StoreOnce

You can configure several backup repositories on one HPE StoreOnce appliance and associate them with different gateway servers.

Mind the following:

  • Deduplication on HPE StoreOnce works within the limits of one object store.
  • If your VMs contain similar data, it is recommended to create backup repositories on a single HPE StoreOnce Catalyst Store. This minimizes backup job duration and reduces disk space used for backups. For details, see this Veeam KB article.

For more information and recommendations on working with HPE StoreOnce, see this Veeam KB article.

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