# Optimized Incremental Scans Using Qumulo Native Change File Tracking APIs

Qumulo REST APIs provide capabilities for optimized scan and backup performance.

## Qumulo REST APIs

Qumulo 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 8000 on the Qumulo devices.

- 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.

## Performance Metrics for Regular and Qumulo Operations

File count: 100 million

File size: Mixed file size

The following tables compare performance metrics between regular scans and Qumulo scans of CIFS share and NFS export snapshots, of new files and modified files.

### CIFS

Backup type | Items | Qumulo CFT scan time
--- | --- | ---
Full | Not applicable | 02:39:00
Incremental | 1 million, modified files | 00:30:00
Incremental | 1 million, new files under a new folder | 00:03:40

### NFS

Backup type | Items | Qumulo CFT scan time
--- | --- | ---
Full | Not applicable | 03:07:00
Incremental | 1 million, modified files | 00:37:00
Incremental | 1 million, new files under 1000 new folders | 00:15:00

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