QNAP Security VioStor NVR (Version: 3.3.2) - Manual (Page 145)

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6.4.3 USB Disk
The NVR supports data backup to the external USB storage devices. Connect the USB
storage device to the USB port of the NVR, when the device is successfully detected, the
details will be shown.
* The VS-101, VS-201, NVR-104 do not support FAT32 and NTFS.