Pretty sure your own home contents cover if you have it covers your own stuff, and the Body Corp insurance covers the community owned stuff, so if they broke into your garage you claim it, if they stole a communal bbq the Body Corp claim. You might actually find that both insurance costs are lowered by investing in the cameras. Mind you, they are as much a preventative notice to crooks as they are an after the fact identifier of what and when should they do something.