# Backup Gateways

Backup gateways handle important functions and use cases.

You don't need to protect backup gateways, and you can re-create them if they're deleted.

## Functions

Backup gateways function as both access nodes and MediaAgents:

- As access nodes, backup gateways connect with, discover, back up, and restore your data source (which the Commvault Cloud control panel cannot access directly).

- As MediaAgents, backup gateways move data to and from the access nodes to the storage targets. Backup gateways also perform deduplication operations before moving data to storage targets.

## Use Cases

The following use cases require a backup gateway.

### Protecting On-Premises Data Sources Using a Backup Gateway

If you want to protect on-premises data sources, and you require a local copy of the backup data, you can use a backup gateway. For more information, see System Requirements for On-Premises Backup Gateways.

### Protecting Cloud Data Sources Using a Cloud Backup Gateway

If you want to protect cloud data sources that have restricted network access, you can use a cloud backup gateway. For more information, see System Requirements for Cloud Backup Gateways.

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