We’re talking ~10TB of video data a year per officer, for relatively high bitrate 8Mb/s video. Assuming there’s a solid 10 hours a day of footage, and they’re working 5 days a week.

For a small town department of say 6. That’s 60TB/y.

If you use even the most expensive large storage provider (AWS S3), that’s ~$19k/y in storage costs. If you use a more appropriate one for encrypted bulk storage like Backblaze, that’s a measly ~$5k/y.

So, per officer. You have ~$800/y (ceilinged to be liberal with the cost) per year, compounding, for storage.

In either case you are grossly overestimating storage costs.

4G transmission costs are going to be expensive, but they shouldn’t be much more expensive than the storage costs, data transfer is relatively cheap when you’re paying for business services.