Scenarios

CSBS supports one-off backup and periodic backup. A one-off backup job is manually created by users and takes effect for only one time. Periodic backup jobs are automatically driven by a user-defined backup policy.

Table 1 describes the two backup options.

**Table 1** One-off backup and periodic backup
Item	One-Off Backup	Periodic Backup
Backup policy	None	Required
Number of backup operations	Only one, manual	Periodic operations driven by the backup policy
Backup name	User-defined backup name, which defaults to manualbk_xxxx	System-assigned backup name, which defaults to autobk_xxxx
Backup method	Full backup at the first time and incremental backup subsequently, by default. CBR allows you to use any backup (no matter it is a full or incremental one) to restore the full data of a server.	Full backup at the first time and incremental backup subsequently, by default. CBR allows you to use any backup (no matter it is a full or incremental one) to restore the full data of a server.
Application scenario	Executed before patching or upgrading the OS or upgrading an application on an ECS. A one-off backup can be used to restore an ECS to the original state in case the patching or upgrading fails.	Executed for routine maintenance of an ECS. The latest backup can be used to restore an ECS in case an unexpected failure or data loss occurs.

You can also use the two backup options together if needed. For example, associate all ECSs with a backup policy to execute periodic backup of all ECSs, and manually perform one-off backups for the most important ECSs to further ensure those ECSs' data security, as shown in Figure 1.

Figure 1 Intermixed use of the two backup options
Click to enlarge