# SnapDiff Backups of Nutanix Files with Changed File Tracking APIs

The Commvault software uses the Nutanix Files Changed File Tracking APIs for faster incremental backups.

A Change File Tracking operation determines which files changed between the previous and current backup snapshots. When you run an incremental backup, only the files that changed are scanned, so the backup is faster.

## Nutanix Files REST APIs

Nutanix Files REST APIs provide the following capabilities for optimized scan and backup performance:

- An incremental scan operation creates snapshots and performs change file tracking.

- A Change File Tracking operation determines which files changed between the previous and current backup snapshots. This requires inbound access to TCP 9440 on the Nutanix Files server Virtual IP.

- The scan and backup operations read data from the snapshots, to shift load from production data shares. To offload production data shares, two snapshots are created and retained: one for the current backup operation and the other for the previous backup operation.

- Make sure that all configured content paths reference the storage array using its Fully Qualified Domain Name (FQDN) and not a shortname or alias.

  This is critical because the SnapDiff API returns change data indexed by the array’s FQDN. If the configured path uses a shortname, the returned change data may not align with the job’s content definition, resulting in missed incremental updates.

  To avoid this, validate that all array references in your subclient or backup set configuration match the FQDN format used by SnapDiff.

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