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I am a new to the security camera stuff so I apologize ahead of time. I have a Dahua NVR model DHI-NVR210 with 3TB hard drive and 4 Dahua IP cameras, 3 are model DH-IPC-HDBW4433R-AS and 1 model is DH-IPC-HDBW4631R-ZS. I have had this system for a half a year and been learning the basics. My...