You can back up an Azure Cosmos DB for MongoDB collection group on demand.
Procedure
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From the Command Center navigation pane, go to Protect > Databases.
The database overview page appears.
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On the Instances tab, click the instance that you want to back up.
The instance overview page appears.
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On the Collection groups tab, click the collection group that you want to back up.
The collection group overview page appears.
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In the upper-right area of the window, click Backup.
The Backup options dialog box appears.
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Under Backup level, select the type of backup that you want to perform, and then click SUBMIT.
The backup size shown in the job details is an estimate.