Introduction: Gary Pearce here. One of the most common questions I get from UK homeowners is how long their CCTV footage should be kept and what storage solution they need. The answer depends on several factors — how many cameras you have, what resolution they record at, whether you need continuous recording or motion-only, and what your insurance or legal requirements demand. Get the storage wrong and you either waste money on capacity you do not need or end up with overwritten footage when you need it most. This guide covers everything you need to know about CCTV storage in 2026.
Key Takeaways:
- Understand the difference between NVR and DVR storage systems
- Learn how to calculate your storage requirements accurately
- Compare cloud storage vs local storage for UK homes
- Discover best practices for footage retention and management
NVR vs DVR — What Storage You Need
The type of recorder you have determines your storage options. An NVR — Network Video Recorder — works with IP cameras that send video data over a network connection. Storage is typically a standard hard drive installed inside the NVR, and the capacity is measured in terabytes. An NVR can also support network-attached storage if you need more space than the internal drive provides.
A DVR — Digital Video Recorder — works with analogue cameras that send video over coaxial cable. DVRs also use internal hard drives but typically support lower resolutions than NVRs, meaning they need less storage for the same recording duration. Most modern DVRs support hybrid setups with both analogue and IP cameras.
For new installations in 2026, I strongly recommend an NVR-based system. IP cameras offer higher resolution, better image quality, and more flexible installation options. The NVR itself is essentially a purpose-built computer running recording software, and most models support drives up to 10TB or more.
How Much Storage Do You Need?
Storage requirements depend on four factors: number of cameras, recording resolution, frames per second, and whether you record continuously or only on motion.
Here is a practical guide based on a typical 4-camera home system recording 24 hours a day. At 1080p resolution recording at 15 frames per second, each camera uses approximately 30GB per day. Four cameras therefore use 120GB per day. A 1TB hard drive gives you about 8 days of continuous recording. A 4TB drive gives you about 33 days.
At 4K resolution recording at 25 frames per second, each camera uses approximately 60GB per day. Four cameras use 240GB per day. A 1TB drive gives you about 4 days. A 4TB drive gives you about 16 days. An 8TB drive gives you about 33 days.
Motion-only recording dramatically reduces storage requirements. On a typical residential property, motion events account for only 5 to 15 percent of the total recording time. With motion recording, a 1TB drive can store 60 to 90 days of footage from a 4-camera system.
HDD vs SSD for CCTV Storage
Nearly all CCTV recorders use traditional hard disk drives rather than solid state drives. The reason is simple — cost per terabyte. A 4TB HDD costs approximately £60 to £90. A 4TB SSD costs £200 to £350. For most home CCTV systems, an HDD provides more than adequate performance.
Choose hard drives designed for surveillance applications. Standard desktop drives are not optimised for the continuous write workload of CCTV recording. Surveillance-rated drives like the WD Purple or Seagate SkyHawk series are designed to handle 24/7 recording without failure. They also include error recovery features that prevent the drive from dropping out of the system if it encounters a bad sector.
Cloud Storage Options
Cloud storage for CCTV is becoming increasingly popular, particularly for homeowners who want off-site backup of their footage. If a burglar steals your NVR, your local footage goes with it. Cloud storage ensures you still have the evidence.
Most major CCTV brands offer cloud storage subscriptions. Hikvision, Dahua, Reolink, and Eufy all have their own cloud platforms. Pricing typically ranges from £3 to £10 per month per camera for 7 to 30 days of cloud retention.
The main downside of cloud storage is the ongoing cost. Over five years, cloud storage for a 4-camera system at £5 per camera per month totals £1,200 — significantly more than a local NVR with a 4TB drive. Cloud storage also depends on your internet connection. If your broadband goes down, cloud recording stops.
A hybrid approach is often the best solution. Record continuously to a local NVR for reliable 24/7 recording, and use cloud storage only for motion-triggered alerts and clips. This gives you the best of both worlds — comprehensive local storage plus off-site backup of important events.
Legal Requirements for Footage Retention
Under UK GDPR and the Data Protection Act 2018, you must not keep CCTV footage longer than necessary. The ICO recommends a maximum retention period of 31 days for most domestic CCTV systems. After this period, footage should be automatically overwritten or deleted.
If you are using your CCTV system for business purposes — for example, monitoring a home office or trade vehicles parked at your property — you have additional obligations. You must have a legitimate interest assessment, a retention policy, and a process for responding to subject access requests.
Your NVR or DVR should be configured to automatically overwrite the oldest footage when the drive is full. Do not disable this feature in an attempt to keep more footage — doing so violates data protection law and could expose you to ICO enforcement action.
Best Storage Practices for 2026
Test your recording regularly. A common problem I encounter is homeowners who believe their system is recording but discover after an incident that the hard drive failed months ago and no footage was captured. Check your NVR status monthly and review a sample clip to confirm recording is working.
Label your hard drives with installation dates. Surveillance hard drives typically last three to five years in continuous use. Replacing them before they fail prevents data loss. When a drive approaches three years of age, start budgeting for a replacement.
Consider a second drive for redundancy. Some NVRs support RAID configurations or can be configured to record to a second drive simultaneously. This gives you protection against a single drive failure.
About the Author: Gary Pearce has been installing and maintaining CCTV systems in the UK since 2004. He provides expert advice on all aspects of CCTV, from camera selection to storage configuration. SIA-licensed and ICO-registered.
Article by Gary Pearce
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