How Cameras Store Footage: Local vs Cloud, DVR/NVR & 24/7

Security systems with local storage keep your footage on a device you own, an SD card in the camera or a DVR/NVR box on site, instead of streaming it to a company's cloud server. That means no monthly cloud fee, faster access to recordings, and video that keeps running even if your internet drops. How the storage options actually work: -> On-camera storage: Many cameras take a microSD card (32GB to 512GB). Simple and cheap, but if a thief grabs the camera, the footage goes with it. Best as a backup, not your only copy. -> DVR (Digital Video Recorder): The classic setup for analog and HD-over-coax (like HD-TVI) cameras. A DVR sits in a closet or rack, records every connected camera to internal hard drives, and connects by coax cable. -> NVR (Network Video Recorder): The IP-camera equivalent. Cameras connect over Ethernet, often with PoE (power and data on one cable), and the NVR records the streams to hard drives. This is the standard for modern high-resolution systems. -> Cloud storage: Footage uploads over your internet to a provider's servers. Convenient and off-site (safe from theft), but it usually carries a monthly subscription and depends on your upload bandwidth. How much footage a DVR or NVR holds: Recording time depends on hard-drive size, number of cameras, resolution, and frame rate. As a rough guide, a single 4TB drive can hold a few weeks of continuous 24/7 recording from a handful of cameras, or longer if you use motion-only recording or H.265 compression. Add bigger or multiple drives to extend retention. We size the drive to the retention you actually need, often 30 days for a small business. Which cameras record 24/7: Continuous 24/7 recording is a feature of the recorder, not just the camera. Wired cameras (PoE IP or HD-over-coax) feeding a DVR or NVR record around the clock because they have constant power and a recorder with storage. Many battery and purely cloud-based cameras only record short clips on motion to save power and bandwidth, so they are not truly continuous. If nonstop coverage matters, you want wired cameras on a DVR/NVR. Local vs cloud, and how to avoid monthly fees: A local DVR/NVR system has no required monthly cloud bill; you pay once for the hardware and own the footage. You can still view it remotely through the manufacturer's app over your own network. The tradeoff is that if the recorder is stolen or fails, you could lose video, which is why we often pair local storage with an off-site or cloud backup of key clips. A hybrid approach, local for everything plus cloud for critical cameras, gives you the best of both. Common questions: Q: What are security systems with local storage? A: Systems that record video to hardware you own, an SD card, DVR, or NVR, rather than a paid cloud service, so there is no required monthly storage fee. Q: What is a security system with a DVR? A: A DVR records analog or HD-over-coax cameras to on-site hard drives. It is a wired, self-contained setup that keeps footage locally without a subscription. Q: What security cameras record 24/7? A: Wired cameras (PoE IP or HD-over-coax) connected to a DVR or NVR record continuously because they have constant power and dedicated storage. Q: Which security cameras record 24/7 vs only on motion? A: Wired cameras on a recorder do true continuous recording. Most battery and cloud-only cameras record only motion clips to save power and bandwidth. Q: How long does an NVR keep footage? A: It depends on drive size, camera count, and resolution, but a common target is about 30 days of continuous recording, adjustable with larger or added drives. CSIT designs and installs local-storage DVR and NVR camera systems across Kansas City and the Missouri-Kansas metro, including Overland Park, Olathe, Independence, and Lee's Summit. We size storage to your retention needs and can add a cloud backup where it counts. Call (913) 375-2274 or email john@sngrpg.com for a walkthrough.