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This is a very common scheme used as a hierarchical data retention strategy.
For example, three sets of backups, such as weekly, monthly and yearly are defined. You can vary this frequency to suit the requirements of your environment. The weekly or Son backups are rotated on a weekly basis with one graduating to Father status each month. The monthly or Father backups are rotated on a yearly basis with one graduating to Grandfather status each year. One or more of the graduated backups is removed from the site for disaster recovery and archival purposes.
There are two ways in which this can be accomplished:
Method 1 - Using Selective Copies (See
Selective Copy
for detailed information)
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Method 2 - Using Extended Retention Rules on the Primary Copy (See
Extended
Retention Rules for detailed information.)
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Method 1 creates separate copies of data which may be useful for off-site storage requirements.
Method 2 carves out a graded retention from a single copy.
In reality, a combination of both these methods may be required. For example, only one selective copy may be created and extended retention established in this selective copy.
In addition, you can manually retain specific jobs for a longer period (in addition to the retention period specified in the copy) if there is a necessity to retain specific jobs. See Retain a Job for more information.