You can back up the data from a standby server using the MySQL block-level backup operation.
You can perform the backup operation only on Linux servers.
Before You Begin
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Install the MySQL agent on the master server and the standby server. For more information, see Deployment - MySQL Agent. 
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Create a new MySQL instance and configure a subclient in the master server and the standby server. For more information, see Managing Instances and Configuring a Subclient for MySQL Database Block-Level Backups Using IntelliSnap. 
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Enable --log-slave-updates parameter on the standby server. 
Procedure
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From the CommCell Browser, expand Client Computers > Client > MySQL > Instance. 
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Right-click the standby subclient, and then click Backup. The Backup Options dialog box appears. 
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Select Full as the backup type. 
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In the Job Initiation section, choose whether to run the backup job immediately or to schedule it. 
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Click OK. 
Note
If replication operation is running during a backup operation, replication is stopped before the snapshot is created. It is then started again automatically.