All security cameras require a central video recorder to transmit and archive the footage captured. DVRs (digital video recorders) evolved from the older VCR models, while NVRs (network video recorders) represent the next step in the evolution of video recording technology. Here’s a side-by-side look at how DVRs and NVRs compare.
from NSSF Blog http://www.nssfblog.com/choosing-a-recording-system-for-your-security-cameras/
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