You can limit the size of data that is backed up for the tenants in a client computer group by setting a quota limit at the client computer group level.
The size of data backed up by the client computer group is calculated once a day at midnight (CommServe time) or when the Commvault services are restarted. For information on how the size of the backed up data is calculated, see Capacity License - Capacity Calculation: Backup.
The quota limit for client groups applies to all applications in your environment.
Before You Begin
Enable the licensing limit feature.
Procedure
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From the CommCell Browser, go to Client Computer Groups. 
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Right-click the client computer group and then click Properties. The Client Group dialog box appears. 
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On the Advanced Settings tab, in the Quota Limit box, enter the limit in gigabytes for this client computer group. 
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Click OK. 
Result
When the limit is exceeded, the administrator receives an email notification for the Client Groups Exceeding Assigned License Limits alert and the backup jobs are placed in a waiting state and are tagged with an error code and error description: Client group capacity limit is exceeded. To restart the backup jobs, increase the limit.