System Programmer Reference › Backing Up Data › Backing Up Non-CMS Minidisks › Change Detection for Physical Backups

Change Detection for Physical Backups

You can run incremental backup jobs to back up only the changed portions of minidisks that are backed up physically. When defining the backup job template file, the CA VM:Backup system administrator can select what option to use for detecting changes during physical backups. Depending on whether the job is a full or incremental backup job, CA VM:Backup will react in the following ways to what is specified for change detection:

• For a full backup, CA VM:Backup uses the change detection selection to determine whether to save hash values in the catalog to use for comparison during an incremental backup to detect whether data has changed.
• In incremental backups, CA VM:Backup uses the change detection selection to determine whether to perform change detection.