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Configuration Configuring a backup policy for a database

Table 3-6

Description of schedule properties (continued)

Property

Description

Retention

The retention period for an Application Backup Policy schedule refers to the length of time that NetBackup keeps backup images.

The retention period for an Automatic Backup schedule controls how long NetBackup keeps records of when scheduled backups have occurred.

For example, if your database is backed up once every Sunday morning, you should select a retention period of at least 2 weeks.

Frequency-based scheduling

Set a retention period that is longer than the frequency setting for the schedule. For example, if the frequency setting is set to one week, set the retention period to be more than one week. The NetBackup scheduler compares the latest record of the Automatic Backup schedule to the frequency of that Automatic Backup schedule to determine whether a backup is due. This means that if you set the retention period to expire the record too early, the scheduled backup frequency is unpredictable. However, if you set the retention period to be longer than necessary, the NetBackup catalog accumulates unnecessary records.

Calendar-based scheduling

The retention period setting is not significant for calendar-based scheduling.

Multiple copies

If you want to specify multiple copies of a backup for the policy, configure Multiple copies on the Application Backup schedule.

Other schedule properties vary according to your specific backup strategy and system configuration. For more information on schedule properties, consult the NetBackup Administrator’s Guide, Volume I.

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