NVR: How to resolve USB backup error caused by not enough storage?

1.Installation case

 - The user wants to back up video footage using a USB memory.

2. Symptom

 - Video backup attempted with USB memory, but failed with an error message that it requires spare space of twice larger size of the prepared USB memory

• Example: 150GB required for video back up
• 1st attempt : Tried back up with USB 32GB →Error message ’64GB required’
• 2nd attempt : Tried back up with USB 64GB→Error message ‘128GB required’
• 3rd attempt : Tried back up with USB 128GB →Error message ‘150GB required’ (Correct size displayed)

3. Cause

- It is designed to stop calculating backup size, if the required space exceeds 200% of the available USB memory.

• For large video backups, calculating the required space can take minutes to hours, which may impact the NVR’s performance.
• To maintain system stability and prevent operational delays, the calculation process is terminated early if the required backup size is more than twice the USB capacity.

4. Measures(Troubleshooting Guide)

- When performing video backup using USB memory, prepare a USB device with sufficient capacity to store the entire backup.

- As a best practice, use a USB memory larger than the estimated backup size to avoid repeated errors.