You can choose any of the secondary nodes to perform backups of MongoDB replica sets and sharded cluster deployments.
Procedure
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From the Command Center navigation pane, go to Protect > Big data.
The Big data page appears.
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Click MongoDB.
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In the Name column, click the cluster that you want to modify.
The cluster page appears.
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On the Nodes tab, do the following:
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Click the check box for the secondary node that you want to use for backups.
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Click Set as data access node.
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