How do I troubleshoot slow Time Machine backup speeds to my NAS?
Last modified date:
2026-01-12
Applicable Products
- All NAS running with QTS or QuTS hero
- Time Machine Backup Service
Scenario
I used my NAS for media streaming without issues. Recently, I started using it as a Time Machine backup destination for my MacBook over Wi-Fi, and noticed the backup transfer speed drops to around 10 Mbps.
Analysis
- Network connection: Wi-Fi speeds are typically slower and less stable than wired Ethernet, especially for large transfers such as initial Time Machine backups.
- Initial backup size: The first Time Machine backup is often large, so it can take considerable time to complete over a wired connection.
Solution
- Connect with Ethernet:
- Connect your MacBook directly to your network using an Ethernet cable (USB or Thunderbolt adapters can help if needed).
- Run the Time Machine backup again and observe speed improvements.
- If the backup runs much faster, Wi-Fi speed is the limiting factor.
- Once the initial backup has completed, incremental backups over Wi-Fi should be much faster.
- If speeds remain slow:
- Check your NAS for firmware updates, and ensure both the NAS and your Mac are up-to-date.
- Restart your NAS and router to refresh network connections.
Note: The first backup can be very large, and may take hours to complete, especially over Wi-Fi. If you continue having performance issues even with a wired connection, review your NAS network settings or contact QNAP support for assistance.
Further Reading
For further assistance, ask other users and QNAP experts in the community. Go to QNAP Community
