Initiate a secondary data backup

This topic describes how to migrate backup data from the source to the destination. Object Storage Service (OSS) and Network File System (NFS) can be used as the backup media.

Prerequisites

The destination device for the secondary backup is configured. For more information about the operation, see Preparations for secondary backup.

Perform a secondary data backup

1. Log on to the sys tenant as the root user.

2. Execute the following statements to perform a secondary data backup:

   obclient> ALTER SYSTEM BACKUP BACKUPSET ALL;
   
   obclient> ALTER SYSTEM BACKUP BACKUPSET N;
   

   ALL specifies the backup set of all data backups. N indicates the backup_set_id of backups to be included in the secondary backup.

   Assume that five backup sets exist with backup_set_id of 1, 2, 3, 4, and 5, and that 1, 2, and 4 are full backups whereas 3 and 5 are incremental backups. The following examples perform a secondary backup on them.

   • Perform a secondary backup on all current backup sets.

     obclient> ALTER SYSTEM BACKUP BACKUPSET ALL;
     

   • Perform a secondary backup on the backup set whose backup_set_id is 3.

     obclient> ALTER SYSTEM BACKUP BACKUPSET 3;
     

     If one backup set is dependent on another, and you have performed secondary backup by specifying the backup_set_id of the referenced backup set first, the system returns an execution error when you try to perform a secondary backup by specifying the backup_set_id of the dependent backup set.

     For the backup sets in this example, the execution fails if you execute ALTER SYSTEM BACKUP BACKUPSET 3; before ALTER SYSTEM BACKUP BACKUPSET 1;.