Need Help Specifying Recorders For 176 Camera Project

i need an expert advise.

Requirements:

Area/Location type: Government (Public Service)

At least 60 days video retention with all cameras at 12 fps (is 12 fps makes sense?)

No. of cameras : 176 (i need allowance for up to 200 cameras for future expansion)

Questions:

1.With this number of cameras and days of retention, which is more pratical to use( in terms of budget and ease of use), NVR appliances or COTS server?

2. What are the things i need to know? (i dont know how to compute bandwidth)

3. how many COTS server / NVR i need? (or how many camera per server?)

3. Can you help in me with the specifications that i must include for COTS server or NVR applicances

4. Amount of Storage? Is SAN needed?

5. how many workstation i need?

Thanks in advance.

End user here.

CAMERA Resolution Camera Type Day&Night Functionality / with IR Day&Night Functionality / with IR / with WDR Total
1.3 Megapixel PTZ 8 138
Fixed Dome 126 4
2.0 Megapixel Fixed Dome 24 4 28
3.0 Megapixel Fixed Dome 4 10
Bullet type 6
TOTAL 176
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