Create a cloud subscription that support the NVR and cameras attached to it for continuous.

Support ALL cameras once it connected to the NVR. Then that data from the hard drive upload to the cloud every second.

I think the developers can write the code in a such away to compress the uploaded video to cloud platform for fast delivery and when a client review on cloud it’s extracted from their app and there.

A Cloud system that mirror the physical NVR with its storage.

Compression of the uploaded videos every 1 minute, for continuous recording even they will have to have an upload management in the NVR or queue area for uploading cloud files.