If you’re shopping for a home security camera system, one of the first questions that probably pops into your head is: “How long will it actually keep the footage?” It’s a fair question. Nobody wants to find out the hard way that their camera overwrote a crucial clip right before they needed it. Here’s the short answer: most systems hold onto video for anywhere from 7 to 30 days, but it really depends on how you set things up—and what you’re willing to pay for. But if you’re tired of subscriptions and want total control, there’s a better way....