Rugged Cams Workhorse DVR 4 Channel - Manual (Page 67)

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The backup process starts after the following message appears:
After backup is completed, press the [Select] button on the message window as shown
below:
Once the following message appears, separate the backup device from the USB 2.0 port on
the front side of the system or remove the built-in CD-RW/DVD-RW: