# Capacity Calculations in the License Summary Report

Capacity usage is determined based on the Front-End Terabyte (FET) capacity, which is measured by calculating the amount of data that is retained in backup, archive, snapshot and replication jobs. The amount of data is measured based on a terabyte (TB) of data defined as 10244 bytes.

Capacity licenses are divided into the following types:

- Archive

- Backup

- Commvault Backup and Recovery

- Commvault Backup and Recovery for Unstructured Data

- Replication

- Snapshot

Notes

- Tern licenses are valid for 30 days.

- Backup and Archive licenses support mostly the same features and agents, but one is intended for backup operations and the other for archive operations.

## Related Topics

- Backups in the Capacity Calculation

- Archive in the Capacity Calculation

- Snapshots in the Capacity Calculation

- Replication in the Capacity Calculation

- Virtual Machines in the Capacity Calculation

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