How Many Days of Security Camera Footage Should You Keep?

Quick Answer: How Many Days Should You Keep Security Footage?

These are planning ranges, not universal legal requirements. Actual retention requirements can vary by jurisdiction, industry, contract, insurance policy and organizational policy. Some U.S. organizations use 30-day policies, while others establish longer or shorter periods based on operational needs. 0

There Is No Universal Security Camera Retention Period

A common misconception is that security cameras are supposed to retain footage for exactly 30 days.

That is not a universal rule.

Retention is determined by several independent factors:

• Type of property
• Risk level
• How quickly incidents are normally discovered
• Recording mode
• Number of cameras
• Camera bitrate
• Available storage
• Insurance requirements
• Customer or contractual requirements
• Industry-specific regulations
• State and local requirements
• Whether footage becomes evidence in an investigation

For ordinary U.S. businesses, there is not one general federal rule that establishes a single minimum retention period for all security-camera footage. Specific regulated situations can have different requirements, so businesses should check applicable laws, contracts and professional legal guidance rather than treating 30 days as a legal requirement. 1

Why 30 Days Is Such a Common Target

Thirty days is useful as a planning baseline because it provides a relatively long investigation window without requiring the storage capacity of 60 or 90 days of continuous recording.

For example, an incident might not be discovered immediately. A property owner could notice:

• Missing equipment several days later
• Vehicle damage after returning from a trip
• A package dispute after delivery
• Unauthorized access during a previous weekend
• Inventory discrepancies during a later audit

A 30-day retention period gives investigators substantially more time to search backward than a 3- or 7-day system.

However, 30 days should be considered a planning choice, not a universal requirement. Several U.S. institutions publicly use 30-day retention policies, while others use 90 days or different periods based on their operational requirements. 2

How to Choose the Right Retention Period

Instead of asking:

“How many days does everyone else keep?”

ask:

“How long could it realistically take us to discover an incident?”

Then consider how much additional time is needed to identify, review and preserve the footage.

A practical planning model is:

Required retention ≈ Maximum incident-discovery delay + investigation/export buffer

For example, if an incident could realistically go unnoticed for two weeks, keeping only seven days of footage creates a significant risk of losing the evidence before anyone knows an incident occurred.

Retention by Property Type

These are starting points rather than legal recommendations. A formal retention policy should take applicable regulations, contracts, insurance requirements and the organization’s operational needs into account.

7 Days vs 14 Days vs 30 Days vs 90 Days

How Incident Discovery Time Determines Retention

This is one of the most important concepts in surveillance storage.

Imagine a warehouse where inventory discrepancies are discovered during a monthly audit.

If an item disappears on Day 2 but the discrepancy is discovered on Day 28, a system retaining only seven days of footage cannot provide the original recording.

A longer retention window would be more appropriate.

The important variable is not the calendar alone. It is the maximum realistic time between the event and its discovery.

Continuous Recording Changes the Storage Requirement

Retention and recording mode are related but are not the same decision.

A 30-day retention policy means something very different for:

• 24/7 continuous recording
• Motion-triggered recording
• Scheduled recording
• Event-only recording

Continuous recording consumes storage much faster because video is written throughout the day.

Motion recording may extend the calendar period covered by the same storage capacity because fewer hours of video are actually recorded.

However, the amount saved depends heavily on scene activity. A busy entrance can generate considerably more event footage than a quiet storage room. Cisco Meraki’s retention documentation, for example, distinguishes retention behavior according to the amount of motion observed by the camera. 3

30 Days of Continuous Recording vs Motion Recording

Do not assume motion recording automatically gives a specific number of additional days. The actual result depends on how much motion occurs and how the system handles event clips.

How Much Storage Does 30 Days Actually Require?

The answer depends on bitrate and the number of cameras.

For continuous recording, the basic calculation is:

Storage (GB) ≈ Bitrate (Mbps) × 10.8 × Cameras × Days

For example, eight cameras recording at 8 Mbps each for 30 days require approximately:

8 × 10.8 × 8 × 30 = 20,736 GB

or approximately:

20.7 TB

This is why retention decisions should be made together with storage planning.

For detailed capacity calculations, see How Much Storage Do Security Cameras Need?.

Retention Comparison for an 8-Camera System

Assuming each camera averages 8 Mbps and records continuously:

This demonstrates a fundamental rule:

Doubling the retention period approximately doubles the required storage when all other variables remain constant.

Why 4K Cameras Make Retention More Expensive

4K cameras can produce substantially more data than lower-resolution cameras, particularly when configured with higher bitrates.

For example, a large 4K installation recording continuously for 90 days can require many times the storage of a smaller 1080p installation with a seven-day retention period.

Therefore, if you want both:

• 4K recording
• 24/7 recording
• Many cameras
• Long retention

you should expect storage capacity to become one of the largest components of the system.

Should You Keep 7 Days of Footage?

Seven days can be reasonable for a low-risk residential installation where incidents are normally noticed quickly.

It may be appropriate when:

• The property is occupied regularly.
• Someone checks the property every day.
• The cameras cover relatively low-risk areas.
• Important events are likely to be discovered quickly.
• Storage budget is limited.

Seven days becomes less attractive when nobody regularly checks the property or incidents could remain unnoticed for weeks.

Should You Keep 14 Days of Footage?

Fourteen days provides a larger investigation window while keeping storage requirements below a 30-day system.

It can be a reasonable compromise for:

• Residential properties
• Vacation homes that are checked periodically
• Small businesses
• Low-to-moderate risk properties

Should You Keep 30 Days of Footage?

Thirty days is a strong general-purpose target for many systems.

It provides enough time to investigate incidents that were not immediately noticed while avoiding the storage requirements associated with 60- or 90-day continuous recording.

Some organizations explicitly use 30-day rolling retention policies and preserve footage longer when it becomes relevant to an investigation or legal matter. 4

Should You Keep 60 Days of Footage?

Sixty days can make sense when incidents may not be discovered within a month.

Examples include:

• Large properties
• Warehouses
• Seasonal properties
• Low-frequency access locations
• Businesses with delayed inventory reconciliation
• Higher-risk commercial environments

The major disadvantage is storage cost, particularly with continuous 4K recording.

Should You Keep 90 Days of Footage?

Ninety days can provide a substantial investigation window, but it should be justified by the property’s risk, operational requirements, contractual requirements or applicable rules.

For a large 4K system, 90 days can require several times the storage of a 30-day configuration.

Do not automatically choose 90 days simply because more footage sounds safer. Longer retention also means more data must be protected, managed and eventually deleted according to the organization’s policy.

When Should You Keep Footage for Longer Than 90 Days?

Longer retention may be appropriate when:

• A specific regulation requires it.
• A contract requires it.
• An insurer requires it.
• The organization’s documented risk assessment supports it.
• Incidents may take months to discover.
• The footage is needed for an ongoing investigation.
• A legal hold or other preservation obligation applies.

Once footage becomes evidence, it should generally be handled under the organization’s evidence-preservation process rather than simply relying on the normal rolling-retention setting.

Normal Retention vs Evidence Preservation

This distinction is critical.

A rolling NVR may automatically overwrite footage after the configured retention period. If an incident is discovered, the relevant footage should therefore be exported or otherwise preserved before it is overwritten.

What Happens When the Retention Period Expires?

Most local recording systems use rolling or overwrite recording.

When storage becomes full, the system automatically removes older footage to make room for new recordings.

For example, if your system has an effective 30-day retention window:

• Day 1 footage eventually becomes the oldest footage.
• New footage continues to be recorded.
• Once storage is full, the oldest eligible footage is overwritten.
• The system continues maintaining a rolling window.

This is fundamentally different from a system that permanently archives every recording.

Retention and Storage Are Directly Connected

There are four variables you should consider together:

Camera count × bitrate × recording time × retention days

Changing any one of these changes storage requirements.

How to Choose Retention for a Home

For a typical home, consider:

• How often someone is at home
• Whether the property is vacant during vacations
• Whether packages or vehicles need monitoring
• How quickly an incident would normally be noticed
• How many cameras are installed
• Whether cameras record continuously or only on motion

A reasonable starting range for many homes is 7–30 days.

If the property is frequently vacant, a longer retention period can make more sense.

How to Choose Retention for a Small Business

For businesses, consider:

• How quickly theft or damage would be discovered
• Inventory audit schedules
• Employee or customer disputes
• Vehicle incidents
• Insurance requirements
• Contractual requirements
• Applicable state and federal requirements

A 30-day baseline can be a useful starting point, but the business should document why its chosen retention period is appropriate.

How to Choose Retention for a Large Property

Large properties often have greater discovery delays because there may be many cameras, buildings, access points and operational areas.

Consider 30–90 days as a planning range where justified by risk and operational needs, then validate the requirement against applicable policies and regulations.

Don’t Give Every Camera the Same Retention Requirement

Not every camera necessarily needs identical treatment.

For example:

The exact values should be determined by your risk assessment rather than applied automatically.

Using Different Recording Modes to Control Retention

You can sometimes achieve a longer calendar retention window without simply buying proportionally more storage.

For example:

• Continuous recording at critical entrances
• Motion recording in low-risk areas
• Scheduled recording during business hours
• Lower-resolution secondary streams for certain applications
• Higher-quality event recordings

This can be more efficient than recording every camera at maximum quality 24/7.

Retention vs Image Quality

Storage planning involves a trade-off.

If storage capacity is limited, you could reduce:

• Resolution
• Frame rate
• Bitrate
• Recording hours
• Retention period

But not all reductions are equally desirable.

For security purposes, reducing image quality can undermine the usefulness of footage as evidence.

Where possible, it is often better to determine the minimum image quality required for the surveillance task first and then size storage around that requirement.

Retention for Identification-Critical Cameras

Cameras covering areas such as:

• Front doors
• Vehicle entrances
• Cash registers
• Access-control points
• Loading docks
• High-value equipment

may deserve higher recording quality or longer retention than cameras covering low-risk areas.

The goal is not simply to store the maximum amount of video. The goal is to preserve useful evidence for an appropriate period.

Cloud Storage Retention

Cloud systems can work differently from NVRs.

A cloud service may provide a defined retention period based on the subscription or service configuration. Some systems may retain event clips differently from continuous recordings.

Therefore, check:

• Number of days included
• Continuous-recording availability
• Event-clip retention
• Download/export rules
• Storage limits
• Subscription requirements
• What happens when a subscription expires

Do not assume that a cloud camera automatically preserves all footage indefinitely.

Local Storage Retention

With an NVR or NAS, retention is primarily constrained by:

• Storage capacity
• Camera count
• Bitrate
• Recording hours
• Recording mode
• Codec
• Available storage architecture

This gives you more direct control over retention but also makes you responsible for storage capacity, hardware reliability, backups and system maintenance.

Retention and Privacy

Keeping more footage is not automatically better.

Longer retention means:

• More storage cost
• More data to secure
• More footage to manage
• Greater exposure if unauthorized access occurs
• Potentially greater privacy implications

A good retention policy should therefore avoid both extremes: retaining too little to investigate incidents and retaining excessive footage without a documented purpose.

Some U.S. organizations explicitly state that routine footage is automatically deleted after a defined period while exceptions are made for investigations, legal obligations or other authorized purposes. 5

USA Security Camera Retention: Is 30 Days Required by Law?

No single federal rule requires every U.S. home or business to retain security-camera footage for 30 days.

Retention requirements can vary according to the type of organization, jurisdiction, industry, contractual obligations and purpose of the recording.

For example, government agencies may have specific records schedules, while certain regulated businesses or state programs can have their own requirements. The U.S. Bureau of Justice Assistance also notes that law-enforcement video retention can vary by jurisdiction and that certain incidents may require extended preservation. 6

Businesses should therefore avoid describing 30, 60 or 90 days as a universal legal requirement.

What Should You Do When an Incident Happens?

Do not rely on the normal retention cycle once footage becomes important evidence.

1. Identify the relevant camera.
2. Determine the approximate date and time.
3. Locate the relevant footage.
4. Export the original or appropriate evidence file.
5. Preserve it separately from normal rolling storage.
6. Record who accessed or exported it where appropriate.
7. Follow the organization’s evidence or legal-hold procedure.

The purpose is to prevent the footage from being overwritten by the normal retention cycle.

Practical Retention Decision Path

1. How quickly would you discover an incident?
   If normally within one or two days, a shorter retention period may be sufficient.
2. Could an incident remain unnoticed for weeks?
   Consider 30 days or longer.
3. Is the property vacant for extended periods?
   Longer retention may be justified.
4. Are there regulatory or contractual requirements?
   Those requirements must be incorporated into the retention policy.
5. Could the footage become evidence?
   Create a process for exporting and preserving relevant footage before automatic overwrite.
6. Can the storage system support the chosen retention period?
   Calculate storage before selecting the final retention target.

Retention Decision Matrix

Common Security Camera Retention Mistakes

1. Automatically Choosing 30 Days

Thirty days is a useful baseline, but it is not automatically correct for every property.

2. Choosing the Shortest Retention to Save Money

A cheap storage system is of little value if the footage has already been overwritten when you need it.

3. Choosing 90 Days Without a Reason

Longer retention increases storage requirements and data-management responsibilities.

4. Forgetting Vacation Periods

A home that is occupied every day has a different retention requirement from a vacation property visited once every few weeks.

5. Ignoring Motion Activity

Motion recording can dramatically change how much footage is generated.

6. Failing to Preserve Evidence

Important footage should not be left inside a rolling NVR where it can eventually be overwritten.

7. Treating Retention as a Storage-Only Problem

Retention is also an operational, security, privacy and compliance decision.

Security Camera Retention Checklist

• ☐ Determine how quickly incidents are normally discovered.
• ☐ Identify the highest-risk camera locations.
• ☐ Decide whether continuous or motion recording is appropriate.
• ☐ Choose an initial retention target.
• ☐ Check applicable laws and regulations.
• ☐ Check insurance requirements.
• ☐ Check contractual requirements.
• ☐ Calculate the storage required.
• ☐ Add practical storage headroom.
• ☐ Configure automatic overwrite appropriately.
• ☐ Establish an evidence-preservation procedure.
• ☐ Review the retention policy periodically.

FAQs

How many days of security camera footage should I keep at home?

For many homes, 7–30 days is a reasonable starting range. A property that is frequently vacant or has a longer incident-discovery period may benefit from longer retention.

Is 30 days enough for security camera footage?

Thirty days is a useful general-purpose target for many systems, but whether it is enough depends on how quickly incidents are discovered, the property’s risk and any applicable requirements.

Is 7 days of security camera footage enough?

It can be enough for a low-risk property where incidents are discovered quickly. It may be inadequate for vacant properties, warehouses or locations where problems can remain unnoticed for weeks.

Is 90 days of security camera footage necessary?

Not necessarily. Ninety days can be appropriate for higher-risk or regulated environments, but many residential systems do not need that much continuous storage.

How long do businesses usually keep security camera footage?

Thirty days is a common planning baseline for many businesses, but actual retention varies widely by industry, risk, contract, regulation and operational requirements. Some organizations retain footage for 60 or 90 days or longer.

Is there a U.S. law requiring 30 days of security camera footage?

No universal federal requirement applies to every home or business. Specific laws, regulations, government records schedules, contracts or industry requirements may impose different obligations.

Should I keep security footage longer if my property is vacant?

Often, yes. If nobody regularly checks the property, incidents may remain undiscovered for much longer. A longer retention window can therefore be justified.

Does motion recording let me keep footage for longer?

Usually, because fewer hours of video are recorded. However, the actual improvement depends on how much motion occurs in the camera’s field of view.

Should every security camera have the same retention period?

No. High-risk entrances, vehicle gates and other critical areas may justify longer retention than low-risk areas.

What should I do if I find an important incident after the retention period?

If the footage has already been overwritten, it normally cannot be recovered from the recording system. This is why retention should be long enough to cover realistic discovery delays and why important footage should be exported and preserved once an incident is identified.

Does keeping footage longer always make my security system better?

No. Longer retention increases storage cost, management requirements and the amount of sensitive footage that must be protected. The goal is an appropriate retention period, not maximum retention.

Final Verdict

For many home security systems, 7–30 days is a practical retention range, while 30 days is a useful general-purpose starting point for many businesses.

However, the correct number is determined by the maximum realistic time between an incident and its discovery, not by a universal number of days.

Use this framework:

Discovery delay → Risk → Legal/contractual requirements → Recording mode → Storage capacity

If incidents are discovered quickly, 7–14 days may be adequate. If an incident could remain unnoticed for several weeks, 30 days or more becomes more appropriate. Higher-risk environments may justify 60–90 days or longer, while regulated applications must follow their applicable requirements.

Most importantly, retention and storage should be designed together. A 90-day retention target means little if the NVR only has enough usable capacity for 20 days of footage.

And once important footage is identified, do not rely on the normal rolling-retention system. Export and preserve the relevant recording before it can be overwritten.

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