want offline because don't want to pay for internet, but still want to be able to access remotely. is that what you mean?

Offline CCTV with local storage is definitely in the market. if you're just next door to it, maybe you can connect it to your WIFI or pull a cable. but offline literally means offline. if you want to access to it remotely whenever from wherever. i don't see how you can make do without subscribing to a telco service