CBR Overview

What Is CBR?

Cloud Backup and Recovery (CBR) enables you to back up cloud servers and disks with ease. In case of a virus attack, accidental deletion, or software or hardware fault, you can restore data to any point in the past when the data was backed up.

CBR protects your services by ensuring the security and consistency of your data.

CBR Architecture

CBR consists of backups, vaults, and policies.

• Backup

  A backup is a copy of a particular chunk of data and is usually stored elsewhere so that it may be used to restore the original data in the event of data loss. CBR supports the following backup types:

  • Cloud server backup: This type of backup uses the consistency snapshot technology for disks to protect data of ECSs and BMSs. The backups of servers without deployed databases are common server backups, and those of servers with deployed databases are application-consistent backups.
  • Cloud disk backup: This type of backup provides snapshot-based data protection for EVS disks.
• Vault

  CBR uses vaults to store backups. Before creating a backup, you need to create at least one vault and associate the resource you want to back up with the vault. Then the backup of the resource is stored in the associated vault.

  Vaults can be classified into two types: backup vaults and replication vaults. Backup vaults store backups, whereas replication vaults store replicas of backups.

  The backups of different types of resources must be stored in different types of vaults.

• Policy

  Policies are divided into backup policies and replication policies.

  • Backup policies: To perform automatic backups, configure a backup policy by setting the execution times of backup tasks, the backup cycle, and retention rules, and then apply the policy to a vault.
  • Replication policies: To automatically replicate backups or vaults, configure a replication policy by setting the execution times of replication tasks, the replication cycle, and retention rules, and then apply the policy to a vault. Replicas of backups must be stored in replication vaults.

Backup Mechanism

A full backup is performed only for the first backup and backs up all used data blocks.

For example, if the size of a disk is 100 GB and the used space is 40 GB, the 40 GB of data is backed up.

An incremental backup backs up only the data changed since the last backup, which is storage- and time-efficient.

When a backup is deleted, only the data blocks that are not depended on by other backups are deleted, so that other backups can still be used for restoration. Both a full backup and an incremental backup can restore data to the state at a given backup point in time.

When creating a backup of a disk, CBR also creates a snapshot for it. Every time a new disk backup is created, CBR deletes the old snapshot and keeps only the latest snapshot.

CBR stores backup data in OBS, enhancing backup data security.

Backup Options

CBR supports one-off backup and periodic backup. A one-off backup task is manually created by users and is executed only once. Periodic backup tasks are automatically executed based on a user-defined backup policy.