That's why matching cable from cameras [ ... disappears, reappears ... ] and into visible on office desk sacrifical anode NAS box works. They don't trace the cabling, they make assumptions based on matching colour. The 'trick' is to make sure the camera display screens cut out if the "fake" NAS goes down .. best to route to screen through sacrifical secondary storage.
> That is a scenario that only happens in the movies.
Here, in my part of the world, it's used by several contracters I'm aware of, in homes, shops, warehouses .. fake drives near camera display screens get destroyed in break ins more often than you realise - and more frequently in recent years.
Even in the US the Afroman raids show the police about to rip drives out of the security system .. if there'd been a decoy box | real time cloud backup there'd be more footage of the raid for his songs and court case.
If you feel that you have a legitimate threat that might lead to attackers trying to disable your video system you would more commonly install better equipment. Cameras that are more covert, or are ruggedized/vandal proof, and installed out of reach. Installations that leave no exposed cables, PC-based video recorders that don't have branding or indications of what they are doing, etc.
I think bigger problem is people that think they can do that in first place still being employed in police...