CCTV Automatically Upload Footage to Storage Server in Different Places

[TunZ2122]

Hi, 

I have several question about CCTV and i can't find good answer anywhere else, so i will just asking here

 

First of all, i have several CCTV network on few different places, they all run normally and i can monitor them through my phone, all fine

Several days later, i was planning to build a storage server using my old PC to save my work files and thinking about making a regular backup from the CCTV to my server at my home using cloud service, maybe, but i just don't know how its works.

 

The question is : 

1. did i need a specific apps or services to do that?

2. did i need to build another pc for every DVR / NVR and then just upload the footage from the pc to my storage server? or i can just directly upload the footage from DVR / NVR?

3. how to setting the DVR / NVR and my storage server so the CCTV footage can automatically uploaded?

 

Side notes, i use DaHua and HikVision DVR / NVR for all my CCTV network

Thanks, and best regards.