Constraints

General

• A vault can be associated with only one backup policy.
• A vault can be associated with only one replication policy.
• A vault can be associated with a maximum of 256 resources.
• A maximum of 32 backup policies and 32 replication policies can be created.
• Only backups in the Available or Locked vaults can be used to restore data.
• Backups in a Deleting vault cannot be deleted.
• When Storage Disaster Recovery Service (SDRS) is used to set up disaster recovery for cloud servers, restorations can be performed at the disaster recovery site only after protection is disabled.
• Backups cannot be downloaded to a local PC or uploaded to OBS.
• A vault and its associated servers or disks must be in the same region.

Cloud Disk Backup

• Only disks in the Available or In-use state can be backed up.
• A new disk must be at least as large as the backup's source disk.
• Cloud disk backups cannot be replicated to other regions.

Cloud Server Backup

• A maximum of 10 shared disks can be backed up with a cloud server.
• Only backups in the Available or Locked vaults can be used to create images and be replicated to different regions.
• Cloud servers support crash-consistent backup, whereas database servers support application-consistent backup in addition to crash-consistent backup.
• Images cannot be created from backups if the amount of resources associated with a server backup vault exceeds the quota.
• You are advised not to back up a server whose disk size exceeds 4 TB.
• Backups can be replicated only to regions that have replication capabilities.
  • A backup can be replicated only when it meets all of the following conditions:
    1. It is an ECS backup.
    2. It contains system disk data.
    3. It is in the Available state.
  • Only backups can be replicated. Backup replicas 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. The replication rule varies with the replication method:
    • Manual replication: A backup can be replicated to the destination region as long as it has no replica in that region. A backup can be replicated again if its replica in the destination region has been deleted.
    • Policy-based replication: A backup can only be automatically replicated to a destination region once. It cannot be automatically replicated to that region again, even if its replica has been deleted.
  • Only replication-supported regions can be selected as destination regions.

SFS Turbo Backup

• Only file systems in the Available state can be backed up.
• An SFS Turbo file system backup cannot be used to restore data to the original file system.
• Backups can be replicated only to regions that have replication capabilities.
  • A backup can be replicated only when it meets all of the following conditions:
    1. It is generated for an SFS Turbo file system.
    2. It is in the Available state.
  • Only backups can be replicated. Backup replicas cannot be replicated again but can be used to create SFS Turbo file systems.
  • A backup can be replicated to multiple regions but can have only one replica in each destination region. The replication rule varies with the replication method:
    • Manual replication: A backup can be replicated to the destination region as long as it has no replica in that region. A backup can be replicated again if its replica in the destination region has been deleted.
    • Policy-based replication: A backup can only be automatically replicated to a destination region once. It cannot be automatically replicated to that region again, even if its replica has been deleted.
  • Only replication-supported regions can be selected as destination regions.

Application-Consistent Backup