# XRN-3210RB2 # USB Back up
1. Installation case
- Department store tried to backup the videos using 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 try : Tried back up with USB 32GB → Error ’64GB required’
2nd try : Tried back up with USB 64GB → Error ‘128GB required’
3rd try : Tried back up with USB 128GB → Error ‘150GB required’ (Correct amount appears)
3. Cause
- It is designed to stop calculating backup capacity if the amount of space to back up exceeds
200% of the free space of USB memory
※ While performing large-sized video back up, the system takes time from minutes to hours to
calculate the needed space and the system gets burden to operate other functions. In order to
secure the system for normal function and prevent from operation burden, If space for back up is
needed more than twice size of prepared USB memory, it is designed to stop the calculation
when the calculation exceeds twice its USB memory
4. Measures (Troubleshooting Guide)
- When performing video back up with USB memory, prepare USB memory with large enough space
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