If you need to back up specific databases, you can do that by creating a user-defined subclient.
Procedure
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From the navigation pane, go to Protect > Exchange.
The Exchange page appears.
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Click an Exchange database.
The Exchange Database page appears.
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On the Subclients tab, in the right area of the page, click Add.
The Add subclient dialog box appears.
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In the Name box, enter a name for the subclient.
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In the Plan box, select a plan.
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In the Data backup streams box, enter the maximum number of streams that are required for running a backup operation.
By default, the number of streams is 2.
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Under Client, select the databases that you want to add to the user-defined subclient:
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Click Add content.
The Add new content dialog box appears.
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From the list, select the databases that you want to include in the subclient. You can use the search function to find specific databases.
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Click Add.
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Under Server details, specify whether to select the backup source manually or automatically:
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To manually select the backup source, select Manual selection, and then, for each database, select the server that you want to use as the backup source.
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To have the software automatically select the backup source, select Automatic selection, and then specify the type of server to use:
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To use a passive server, select the Backup from passive copy check box.
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To use the active server when no passive server is available, select the Backup from active copy if no passive copy is available check box.
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To run backup operations on the server that is least likely to become active in a failover case, select the Use last activation preference to select passive copy check box.
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If you want block-level backup operations to use the backed-up databases for live browse, under Advanced options, select Optimize for message level recovery.
You can also enable block-level backups later.
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Click Save.
Result
The user-defined subclient appears on the Exchange Database page, under Subclients.