alternative brand NVR for Zmodo WiFi ip cameras

[thndrwlf 0]

I purchased about 5years ago Zmodo cameras and have been monitoring them with the Zmodo app. I would like to get a NVR so that I can have continuous recording as the cool down for the free cloud service is something like 5 minuits and only a 10 second clip (worthless for most situations other than initial notification). The problem is now that I am in the market for an NVR I am having trouble with finding any newer NVR's from Zmodo and am unsure about bying this brand as the reviews havent exactly been stellar. I would like to see if there might be an alternative brand NVR that will work with my existing cameras but have heard that the most recent firmware updates no longer work with other brands. I would also like a NVR that uses DropBox for its cloud service if possible.