Replicating Backups Across Regions

Scenarios

Cross-region replication of server backup vaults allows you to replicate backups from one region to another in the same account.

Replicas of server backups can be used to create images and provision servers.

With cross-region replication, you can quickly deploy services in a different region. The new resources created from replicated backups are in the same state as the original resources when you took the backup.

You can replicate backups in either of the following methods on the CBR console:

• Select a backup from the backup list and manually replicate it.
• Select a backup vault and manually replicate it. Alternatively, you can configure a replication policy to periodically replicate backups that have not been replicated or failed to be replicated to the destination region.

This section uses the first method to describe how to replicate a backup. For details about the second method, see Replicating a Vault Across Regions.

Constraints

• A server backup can be replicated only when it meets all the following conditions:
  1. It is an ECS backup.
  2. It contains system disk data.
  3. It is in the Available state.
• Only backups or backup vaults can be replicated. Replicated backups and vaults cannot be replicated again but can be used to create images.
• A backup can be replicated to multiple regions but can have only one replica in each destination region. Replication rules vary with the replication method:

  Manual replication: A backup can be manually replicated to the destination region as long as it has no replica in that region. A backup can be manually replicated again if its replica in the destination region has been deleted.

  For manual and policy-based vault replication, a vault can only be replicated to a destination region once. It cannot be replicated to that region again, even if its backups have been deleted.

• Only replication-supported regions can be selected as destination regions.

Create a Cross-region Backup Replication

1. Click in the upper left corner of the management console and select the region where the backups to be replicated are located.
2. Click the Backups tab. Locate the desired backup. For details, see Viewing a Backup.
3. Choose More > Create Replica in the Operation column of the backup.

4. In the displayed dialog box, configure the parameters as described in Table 1.

   Table 1 Parameter description

   Parameter	Description
   Name	Replica name. You can enter a custom name or use the default name resource name_xxxx. A name can contain 1 to 64 characters. Only letters, digits, underscores (_), and hyphens (-) are allowed.
   Description	Replica description. This parameter is optional. It cannot exceed 255 characters.
   Destination Region	Region that the backup is replicated to. Only the regions that support replication will be displayed. If the selected region contains only one project, you can directly select the region name. If the selected region has multiple projects, the default project of the region is preselected. You can select another project if needed.
   Destination Vault	A replication vault in the destination region You can replicate backups to vaults in multiple destination regions. Creating replica will replicate all backups in the source vault to the destination vault.

   

   The traffic for cross-region replication is the size of the replicated backup.

5. Click OK.
6. After the replication is complete, you can switch to the destination region to view generated replicas. For details, see Viewing a Backup. You can then use the backups to create images.