CCTV without internet: what works and what does not

Cameras need the internet not for recording, only for watching from afar. Recording goes on without it.

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Sorting it out

What works without internet

Recording — worksCameras record to the recorder over their own cable. The internet plays no part in it.
Watching on site — worksA monitor or a TV is connected to the recorder to watch live view and the archive.
Watching from a phone — noTo open the cameras from afar the site needs an internet connection.
Phone alerts — noA motion alert also travels over the internet.
If there is no wired internetRemote viewing can be arranged over mobile internet — with a router that takes a SIM card.

Questions

Will footage be lost if the internet goes down?

No. The recorder keeps recording and the footage stays on its disk.

And if the power goes out?

Without power the system does not record. To ride out a power cut, the recorder and the switch are connected to an uninterruptible power supply.

Can cameras be installed where there is no internet at all?

Yes. The system will record, and it can be watched on site.