CCTV recording to NVR and also to NAS box simultaneously

Dear Experts
We are evaluating CCTV surveillance system appox 25 to 30 cameras which should store 03 months of recording hence NVR hard disk capacity we have sized 6 TB.  We have connected this location over MPLS link to the Head office hence we are thinking to look for solution but not sure at camera side or NVR side the recording to happen parallel to NVR and also to NAS device and this NAS device will replicate to another identical NAS device over MPLS link at head office
1.Please help is there any specific type of cameras OR NVR we should consider so that at the same time two places the recording is done one at NVR disks this is going to rotate once in month hence at any given time only last 30 days recording is available.
2.Also simultaneous recording in additional to NVR to store to NAS box for example synology NAS box ( one at site and another one in head office every day replication scheduled to head office)
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IT administrator Small Business Owner
Commented:
My best recommendation would be to use ZoneMinder, an open source NVR solution.
Then you can cater the storage, retention and output to whatever you need.
A roll your own solution, if you will.
AFA recording to multiple devices, there are many ways to accomplish this.
I would first get down the specifications of how much storage, and the logistics of the storage devices.
Then you can figure out what you want to do.

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