You can back up a Cosmos DB for Apache Cassandra table 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, in the row for the instance, click the action button
, and then click Backup.The Backup options dialog box appears.
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Select the Backup level that you want, and then click SUBMIT.
The backup size shown in the job details is an estimate.