Like Skynet, Just on the Ground
Traditional databases with their support for transactions, concurrency control, and recovery protocols are an overkill for such data
I would think that given that increasing the number of devices pointing to the file system also increases the number of points of failure, a transactional approach would be the way to go. Eh... shows what I know. I am admittedly behind the curve on this as I am only starting to automate my home. I do not anticipate tying my stuff in with every other home's, though. It might be an advantage for some folks, but I do not think it would be a net gain to incorporate my personal network into a neighborhood surveillance system.