I just wanted to try the cluster functionality, but it seems it's gone with the actual firmware. Maybe it was to unstable, I dunno. It is not available through the WebUI anymore. Didn't checked the GUI so far. I suppose the cheap NVR never had that feature.
So here comes your cheap solution:
It is not necessary to get a NVR with two LAN ports, as long as both NVR are in the same Network with their normal address for WebUI. It is connected the same way like you watch your cams with WebUI, SmartPSS or iDMSS.
For testing I ordered this one from
@EMPIRETECANDY NVR4116-4KS2
You add your first NVR to your second NVR like you would add cameras to your first NVR. A search should display your first NVR.
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Select your first NVR and click "Manual Add".
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In the popup click connect, then it should show the number of channels your first NVR got.
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After clicking "OK" it will add the first 16 channels to your new NVR.
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If these are the wrong channels you could edit them of course.
That's it. Now you'll see the channels in your second NVR with all IVS rules etc. and are able to configure your schedules as you are used to.