Most people do not think about how long their camera footage is stored until they need to find something that happened two or three weeks ago.

That is usually the worst time to discover the system only keeps seven days.

There is no single answer to how long CCTV footage is stored. Retention depends on how the system was configured, how many cameras are recording, the resolution they record at, how often they record, and how much storage is available.

What happens when the storage fills up

Most CCTV systems do not simply stop recording when the hard drive is full.

They overwrite the oldest footage automatically. Today replaces the oldest day on the recorder, then tomorrow replaces the next one, and so on.

That means your retention period is effectively a moving window. If the system holds fourteen days, footage from fifteen days ago disappears as new footage is recorded.

This is why knowing the actual retention period matters. Once footage has been overwritten, increasing the storage afterwards cannot bring it back.

What determines how many days you get

Four things have the biggest effect.

Number of cameras. Eight cameras fill the same drive roughly twice as quickly as four cameras recording at equivalent settings.

Resolution. Higher resolution produces larger files. A 4K camera records considerably more data than a 1080p camera, so upgrading camera quality without increasing storage can reduce retention significantly.

Recording mode. Continuous recording uses storage all day. Motion recording only stores footage when activity is detected, so it can extend retention substantially in quieter areas.

Drive size. More storage means more days, assuming everything else stays the same.

A properly specified CCTV system installation should therefore start with the retention you actually need rather than simply installing whatever hard drive happens to come with the recorder.

How much retention does a home actually need?

For most households, around two weeks is a sensible target.

That covers a holiday and gives you enough time to realise something happened, work out approximately when it happened, and go back through the footage.

There are situations where longer makes sense. A holiday property, a home that is regularly left empty, or a property where nobody checks the cameras frequently may benefit from a month or more.

The important thing is deciding that upfront rather than discovering later what the default settings happened to give you.

Local recording versus cloud storage

Local recording usually means footage is stored on a hard drive inside a recorder at the property.

The advantage is that it keeps recording even if the internet connection goes down, and there is usually no ongoing storage subscription.

The disadvantage is obvious: if someone takes the recorder, they may take the footage with it.

Cloud recording protects against that because the footage is stored off site and can be accessed remotely. The trade-off is that it normally requires an ongoing subscription and depends on the internet connection.

A practical middle ground is local continuous recording with selected motion events also backed up remotely.

Do not assume higher resolution is automatically better

Higher resolution genuinely helps when you need detail. Faces, clothing, vehicles and other identifying information are easier to see when there are more pixels available.

But there is a storage cost.

If an existing recorder is upgraded from lower-resolution cameras to 4K cameras without increasing its storage, the amount of history available can drop substantially.

Camera quality and retention therefore need to be specified together. Our home security camera installation service considers both the footage quality required and how long that footage needs to remain available.

Subscriptions are worth checking before you buy

Some systems store footage locally without any ongoing fee. Others put most useful recorded history behind a subscription.

Before choosing a system, ask three questions:

  • What does it record without a subscription?
  • How long is that footage available?
  • What stops working if the subscription is cancelled?

The answers vary significantly between systems. We source equipment to suit the requirement rather than pushing one particular brand, so storage and ongoing costs are part of the conversation before equipment is selected.

Check the system you already have

If you already have CCTV, do not assume it is keeping the amount of footage you expect.

Open the recorder and see how far back you can actually search. If you expect a month and the oldest footage is six days old, something needs changing.

Older systems are particularly worth checking because hard drives wear over time, settings may never have been optimised, and camera upgrades can increase storage use without anyone adjusting the recorder.

If you are unsure what your existing system is retaining, a CCTV maintenance and repair check can confirm the actual retention period, recorder settings and condition of the storage drive.

Security installation is licensed work in New South Wales. AVsion holds Security Master Licence 000103421 and Security Operator Licence 000233371. All installation work carries a 12 month labour warranty.

Written by Yariv, Owner and Lead Installer at AVsion. 14 years installing AV, WiFi and security systems across Sydney’s eastern suburbs.

Frequently asked questions

How long is CCTV footage usually kept?

It varies enormously, from a few days to over a month, because footage overwrites itself once the storage fills. How long you get depends on the number of cameras, the recording resolution, whether the system records continuously or only on motion, and the size of the drive. Two homes with identical cameras can have very different retention simply because of how those settings were configured.

What is a good retention period for home CCTV?

For most households around two weeks is a sensible target. That covers a holiday, and it is long enough to notice something happened and go back to find it. Anything discovered much later is usually handled through police or insurance rather than by reviewing footage yourself. Properties left unoccupied for longer periods are worth specifying with longer retention from the start.

Is local recording or cloud recording better?

They protect against different things. Local recording keeps working if your internet drops and has no ongoing subscription, but the recorder can be stolen along with everything else. Cloud recording survives theft and is accessible anywhere, but usually requires a subscription and depends on your internet connection. Many homes use local recording as the main record with cloud backup of motion events only.

Does recording in 4K reduce how long footage is stored?

Yes, significantly. Higher resolution footage takes up considerably more space, so a 4K system will fill the same drive far faster than a 1080p one. Higher resolution genuinely helps with identifying detail, so it is often worth having, but the storage needs to be specified to match. This is one of the main reasons systems end up with much shorter retention than the owner expected.

Do I need a subscription for my security cameras to record?

It depends entirely on the system. Some brands limit recorded history behind a subscription and provide only live viewing or very short retention without one. It is worth asking before purchase what the system records without a subscription, for how long, and what changes if you stop paying. We source equipment to suit the requirement rather than pushing a particular brand, so this gets discussed upfront.

Can I check how long my existing system is keeping footage?

Yes. The retention period can be checked in the recorder settings, and it is worth doing rather than assuming. Many systems were configured on default settings at installation and are keeping far less footage than the owner expects. If a system is older, drives also degrade over time, which is one of the things covered in a maintenance check.