Night Owl HDA SERIES User Manual page 26

2. Plug the DVR power adapter into the power input on the rear of the DVR.
3. Plug the other end of the DVR power adapter cable into an available wall
outlet. If you are using an uninterruptable power supply (UPS), plug the
adapter cable into one of its output sockets. Keep in mind, Night Owl always
recommends utilizing a surge protector to minimize the risk of damage caused
to your DVR in the event of a power surge.
Night Owl's DVR-BBHDA10PB-8 is our revolutionary battery backup designed for
security DVR's. We recommend all customers utilize the battery backup with your DVR.
http://nightowlsp.com/hda10p-dvr8bb-2tb.html
26 HDA Series Users Manual