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You can get POE(power over ethernet) cameras that dont require a separate power source. Closed circuit cameras are the only way to go.
Nationalize his business and sanction all his assets for aiding and abetting the enemy and working as a foreign agent against the US and our allies. Lock him up or deport his ass to Russia.
Any closed circuit security systems, ones that aren’t cloud based will come with an NVR (like a DVR) that hosts your recordings locally. Most are wired but some support wireless as well. Generally more expensive but in my opinion worth it.
My mom bought a simple setup for I think 3 or 400 dollars at Costco.
INAL but law enforcement can still request or subpoena your video if they suspect a crime has been witnessed by your cameras AFAIK. But at least you’ll know about it.