How Long do Security Cameras Keep Footage?

Quick Answer

Most businesses keep security camera footage for 30 to 90 days, though the right window depends on your storage capacity, recording settings, your industry, and any compliance requirements that apply to your business. Homes and small businesses often rarely need to keep footage for longer than a week or two, while regulated industries, like casinos, cannabis retailers, and financial institutions, face specific minimum retention rules that range from 7 days to a year depending on the state and the type of footage involved. 

How Long Do Security Cameras Typically Keep Footage?

For most commercial businesses, whether that’s a hotel, retail store, restaurant, or office, 30 to 90 days is the standard window for retaining security camera footage. That range gives operators enough time to review footage after an incident, dispute, or insurance claim that isn’t immediately noticed, without paying for storage for months of video footage that will likely never need to be reviewed.

How long surveillance camera footage actually lasts on a given system depends less on a set number of days and more on how much storage is available for the footage and how it’s being used. A small system recording only when triggered by motion can stretch 30 days of footage across a fraction of the storage a 24/7 continuous feed would need; a large multi-camera deployment recording continuously could fill the same drive in a matter of days. 

Ultimately, the question “how long does the average security camera store footage” doesn’t have one universal answer. Rather, you should think of it more as a function of storage capacity, recording settings, and how the footage is being managed.

Typical Retention Periods by Business Type

Retention expectations vary quite a bit by industry, so we should first separate typical best practices from any real legal or regulatory floor. Most businesses aren’t legally required to keep footage for any specific length of time, but a handful of regulated industries are.

However, “regulation” can be used loosely, so let’s unpack a little more of the details:

• Casinos are governed by state gaming boards instead of one federal standard. Nevada’s regulations, among the most detailed in the industry, require routine surveillance footage to be kept for a minimum of 7 days (a rule change expected to take effect in 2027 will increase this to 15 days), with footage of detentions or interrogations held for at least 30 days. Properties often retain footage longer than this minimum, but said regulatory minimum itself is shorter than many assume.
• Banks don’t have a single federal retention rule either. States, however, typically do – and requirements vary widely, from Maine’s 2-month minimum for non-evidentiary footage to Delaware’s 1-year requirement. Due to the prominence of the state in banking and the financial industry, we’d like to call special attention to New York’s 45-day rule under its ATM Safety Act.
• Healthcare organizations are often assumed to face a HIPAA-mandated retention window, but HIPAA, in fact, doesn’t set one – it requires that your organization has a documented policy, but it doesn’t mandate a specific number of days. In practice, most healthcare systems land on retaining footage for 30 to 90 days based on state rules and their own risk assessments.
• PCI DSS doesn’t require cameras at all, but if a business chooses to use video to monitor an area that handles cardholder data, like a server room, that footage must be retained for at least 90 days to meet the standard.

What Determines How Long Camera Footage Is Stored?

A handful of factors decide how long any given system can hold onto footage before something has to give – either acquiring more storage or moving to a shorter retention window:

• Storage capacity. This could be a local hard drive, an SD card, or a cloud plan.
• Recording mode. Continuous 24/7 recording uses dramatically more storage than motion- or event-triggered recording.
• Resolution and bitrate. Higher-resolution footage takes up more space per second of video.
• Number of cameras. Storage needs scale directly with how many feeds are being recorded.
• Compliance requirements. This applies to businesses in a regulated industry with a minimum retention rule.
• Business risk tolerance. Some businesses choose to store more than the minimum, simply because storage is cheap relative to the cost of losing footage they later need.

How Much Storage Do Security Cameras Need?

The simplest way to estimate storage is with this straightforward formula:

Storage Calculation

Estimated Storage (GB) = Number of Cameras × Bitrate (Mbps) × 0.45 × Recording Hours per Day × Retention Period (Days)

The 0.45 factor converts megabits per second into gigabytes per hour. As an example: one 1080p camera recording continuously at a typical H.265 bitrate of 3 Mbps works out to 3 × 0.45 × 24 × 30 ≈ 972 GB, or just under 1 TB for 30 days of footage. Add cameras or extend the retention window and the number scales up from there.

Using that same math across typical H.265 bitrates, here’s roughly what a single camera needs per month of continuous recording:

These aren’t guarantees, mind you; they’re starting points. You’ll need to do some assessment based on your actual business’ results over time. Actual usage can swing quite a bit based on scene complexity and motion; a static back office will use meaningfully less storage than a busy parking lot at the same resolution and bitrate. 

Motion-triggered recording instead of continuous recording is the single biggest lever for cutting storage needs – often by 70% or more – since the camera isn’t writing data during long stretches when nothing is happening. (Your Pro-Vigil representative can walk through the specific bitrate, retention defaults, and storage architecture used for your deployment, since actual numbers vary by camera model and configuration.)

Factors That Affect CCTV Storage Capacity

• Resolution: 4K footage carries roughly 2-3x the data of 1080p at a comparable bitrate.
• Compression: H.265 can cut file sizes by 40-50% compared to older H.264 at similar quality, which is why it’s the current standard for most new deployments.
• Frame rate: 15 fps is standard for most commercial security use; bumping it up to 30 fps roughly doubles storage for a smoothness gain that rarely matters for evidentiary footage.
• Recording mode: continuous recording will capture dead air along with everything else; motion-triggered recording saves storage space by only recording when things are going on.
• Number of cameras and retention length: both scale storage needs directly and predictably, per the formula above.

What Happens When Storage Is Full?

Most local systems, DVRs, NVRs, and SD card setups, handle a full drive the same way, namely, they overwrite the oldest footage automatically. This is called loop recording, and it’s the default behavior for the vast majority of on-site systems. Once storage hits capacity, the system cycles back to the beginning and starts recording over the earliest saved footage, with no warning nor any need for manual input.

This makes sense, of course; the last thing you want is to avoid recording critical footage because someone wasn’t around to press the “yes, overwrite footage” button in the middle of the night. 

Of course, the practical risk here is that if an incident isn’t noticed and its footage pulled quickly enough, it may already be gone by the time someone goes looking for it. A system running 24/7 at high resolution on limited storage can start overwriting footage in a matter of days – this is the strongest argument for sizing storage correctly from the start; you don’t want to discover this is an issue after it’s actually caused a security vulnerability.

Cloud-based systems generally behave differently: rather than silently overwriting, most either prompt an account holder to expand storage or automatically archive older footage to a lower-cost, longer-term tier. Some platforms also allow per-camera retention rules, so higher-priority feeds hold footage longer while lower-priority ones cycle faster.