Help Center > > Service Overview> Constraints


Updated at:Aug 10, 2020 GMT+08:00

Common Constraints

  • A vault can be bound to only one backup policy.
  • A maximum of 32 backup policies can be created.
  • Only backups in a vault in the Available or Locked state can be used for data restoration.
  • A backup in a vault in the Deleting state cannot be deleted.
  • 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.
  • Disks cannot be created in batches using backups.
  • The capacity of a newly created disk cannot be smaller than that of the source disk of the backup data.

Cloud Server Backup

  • Shared disks on a server can be backed up. A server mounted with a maximum of 10 shared disks can also be backed up.
  • Only backups in a vault in the Available or Locked state can be used for image creation.
  • Crash-consistent backup for multiple disks and application-consistent backup for database servers are supported.
  • Backing up specified disks on a server is supported but such a backup of disks must be restored as a whole. File- or directory-level restoration is not supported.
  • Images cannot be created using backups if the amount of resources associated with a server backup vault exceeds the quota.
  • You are not advised to back up a server whose capacity exceeds 4 TB.

File System Backup

  • Only file systems in the Available state can be backed up.
  • A file system backup cannot be used to restore data to a file system.

Hybrid Cloud Backup

  • Backups synchronized to the cloud cannot be used to create servers.
  • Storage backups can only be used to restore to other cloud servers and can only be restored to the data disks.

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