You can configure the Commvault software to always run a copy-only full backup for an Always On availability group instance. A copy-only backup is an independent backup that you can perform on any secondary replica in an availability group.
You can perform copy-only backups of availability groups for special purposes, without affecting other backups or restores. You can perform the following backups as copy-only backups:
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Full backups
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Full Volume Shadow Services-enabled backups
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Full IntelliSnap backups
When you run a log backup after a copy-only full backup, the log backup is automatically linked to the copy-only full backup and follows the retention rules of the copy-only full backup. If there are any missing logs during the log backup, the next backup operation is automatically converted to a regular full backup.
Before You Begin
Verify that you have Feature Release 11.21 installed on all the nodes in the Always-On cluster.
Procedure
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From the navigation pane, go to Protect > Databases.
The instances page appears.
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Click the SQL Server availability group instance that you want to enable copy-only backups for.
The instance page appears.
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On the Configuration tab, in the SQL Availability group replicas section, move the Offload full backup job to secondary replica toggle key to the right.