Taking Over / Expanding Digital Watchdog System - Any Advice?

Client has 24 cameras on a BlackJack Cube NVR. Not sure of the specs. I saw the NVR and sent support the SN in hopes they can give me the build specs. The engineer got me in the server room but the IT guy was not there so I was not going to start touching things in the server room.

They have 24 2MP cameras on this NVR and want to add 34 2MP or 4MP more cameras now, and possibly some in another year. We are trying to figure out if we need a 2nd server.

They have clients in various locations.

We have never used DW, but some here seem to like it. Anything we need to be aware of? There may be some cameras we choose not to use DW, is it pretty friendly to non DW cameras?

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