Dual Stream Camera: Why?

This is a very general question. Desired result is help in answering a question inside my office. We live monitor accounts for a fee; loosley vsaas. This is a service we offer in house (not sold to 3rd party monitoring company) along with full integration service etc...Historically we have stuck to one manufacturer because we know how to manage the data streams (important for managing more than 6000 cams daily in the field) and we do dual stream (1 to on site DVR 2nd to our monitoring center, or at least that is my understanding. I am a salesman so please forgive technical lack of knowledge etc.)

ANYWAY, we recenlty started testing some new cameras and their is an argument to whether we need dual stream or not. ANY and all theory and explanation of the dual stream concept will be greatly appreciated as there is not anyone in our office that is enough of an authority to answer it definitively. I am sure members of this site have the knowledge base to educate us and answer the question.

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