ESV4 User’s Manual 117
USB Backup
It’s a function that allows users to backup the recording data in its database file format (not AVI) to the externally connected USB hard disk.
You can check the “Disk Status” page under “System Options” to see if the USB disk has been detected by the NVR. If it's available, it will also be in the USB HDD
* It needs a USB disk containing free space larger than 100MB.
