How long your home CCTV system keeps footage isn't set by law. It's set by how much storage you have and how your cameras are configured. With the typical entry-level security camera writing 1-2GB per hour per camera, a system recording 24/7 will fill even a large hard drive faster than most people expect. Here's how to calculate what you actually need, what the law says about keeping footage of others, and what your options are for reliable long-term storage.
In short: Most home systems retain 7-30 days of footage depending on storage size, camera count, and resolution. To extend retention, you need more storage or motion-only recording. A NAS with large-capacity drives is the most cost-effective way to store months of footage without paying ongoing cloud fees.
There's No Legal Minimum or Maximum for Home CCTV Retention in Australia
Unlike businesses, Australian homeowners are not subject to a mandatory retention period for CCTV footage. The length you keep footage is entirely a practical decision: how much storage you have, how you've configured recording, and how long you want to be able to look back.
That said, there are legal considerations around privacy. Under the Australian Privacy Act 1988, private individuals are generally exempt from privacy law obligations when using CCTV for personal, household, or domestic purposes. However, if your camera captures footage of neighbours' properties, public footpaths, or other people's spaces, you may have obligations under state surveillance and listening device laws. These vary by state. In Victoria, for example, the Surveillance Devices Act 1999 applies. As a general rule: aim cameras at your own property only.
For insurance and police report purposes, most Australian insurers and police recommend retaining relevant footage for at least 30 days. In practice, the limiting factor is almost always storage, not intent.
How Much Storage Do You Actually Need?
The storage required depends on three variables: number of cameras, recording resolution, and whether you record continuously or only on motion detection.
As a rough guide:
- 1080p camera, continuous recording: ~1.5-3GB per hour, ~36-72GB per day
- 4K camera, continuous recording: ~6-12GB per hour, ~144-288GB per day
- 1080p, motion-only recording (typical home): ~5-15GB per day
For a 4-camera 1080p system on motion-only recording, expect 20-60GB per day depending on activity levels. To retain 30 days, that's 600GB-1.8TB. To retain 90 days, 1.8-5.4TB. These numbers explain why cloud storage for CCTV becomes expensive quickly. And why local NAS storage is the standard choice for longer retention.
Storage Options for Home CCTV
SD Cards or Built-in Camera Storage
Many entry-level cameras include a micro-SD card slot (typically 32GB-256GB). At 3GB/hour continuous, a 128GB card holds roughly 40 hours of footage before overwriting. Adequate for motion-triggered clips but not for any meaningful retention period. SD cards also fail frequently in outdoor temperature cycling. Not a reliable long-term solution.
Cloud Recording (Subscription)
Brands like Ring, Eufy, and Arlo offer cloud recording plans in Australia, typically AU$4-15/camera/month for 30-60 days of storage. For a 4-camera system at AU$8/camera/month, that's AU$384/year. Footage is stored offshore (US/EU data centres in most cases). Uploading 4K footage continuously also stresses NBN upload bandwidth. Most cloud camera systems compress aggressively to compensate.
NVR (Network Video Recorder) with Internal Drive
A dedicated NVR is purpose-built for CCTV storage. Entry-level 4-channel NVRs with a 2TB drive cost ~AU$200-400. Capacity is fixed. When the drive fills, oldest footage is overwritten. No monthly fee. Suitable for basic home setups that only need 7-14 days retention at standard resolution.
A NAS as CCTV Storage
A NAS (Network Attached Storage) is a flexible alternative that works alongside most IP camera systems and NVRs. It stores footage on large-capacity drives (4-18TB per drive), supports RAID for redundancy, and can be accessed remotely. Synology's Surveillance Station and QNAP's Surveillance Station software turn a NAS into a full NVR. Supporting motion alerts, scheduled recording, and multi-camera management.
The key advantage: you can scale storage without replacing the whole system. A 2-bay NAS with 2×8TB drives (~AU$900-1,100 all up) gives 16TB of raw storage. Enough for months of footage from a 4-camera system on motion-only recording. No ongoing fees. What a NAS is and how it works is explained here.
What Happens When Storage Fills Up?
Most systems. NVR, NAS, and cloud. Overwrite the oldest footage automatically once storage is full. This is the expected behaviour. If you need to retain specific footage (an incident, a suspicious event), copy it to a separate drive or folder immediately. Don't rely on automatic retention policies to preserve it.
For insurance claims or police reports, Australian police typically ask for footage from the 48-72 hours surrounding an incident. For most home setups, retaining 14-30 days provides adequate coverage without needing enormous storage.
For a detailed look at how storage requirements scale with camera count and resolution, the NVR Storage Calculator on this site calculates exact figures for your setup.
Related reading: our NAS buyer's guide.
How long does home CCTV footage need to be kept in Australia?
There's no legal minimum for home CCTV retention in Australia. For insurance or police reporting purposes, retaining 14-30 days is practical guidance. Businesses (shops, offices, etc.) may have different obligations under state surveillance laws or industry-specific requirements. Home users are generally exempt from these.
How much storage do I need for 30 days of CCTV footage?
For a 4-camera 1080p system on motion-only recording (typical home setup), expect 600GB-1.8TB for 30 days. For continuous recording at 1080p across 4 cameras, budget 4-8TB for 30 days. 4K systems require 4× more storage than 1080p at equivalent settings. Use an NVR storage calculator for precise numbers based on your camera count, resolution, and recording mode.
Is home CCTV footage private in Australia?
Private individuals using CCTV for domestic purposes are generally exempt from the Australian Privacy Act. However, state surveillance laws may apply if cameras capture footage of others in private spaces or beyond your property boundary. Direct cameras at your own property only and check your state's Surveillance Devices Act if you have questions about specific placements.
Can I use a NAS instead of a dedicated NVR for CCTV?
Yes. Synology Surveillance Station and QNAP Surveillance Station turn a NAS into a full NVR. Supporting motion detection, scheduled recording, multiple cameras, and remote access. The main advantage over a dedicated NVR is scalability: you can add larger drives as your needs grow without replacing the whole unit. Most IP cameras (ONVIF-compatible) are supported.
Is cloud storage or a NAS better for home CCTV?
For short-term convenience (7-14 days, 1-2 cameras), cloud plans from Ring or Eufy are simple and work well. For longer retention, more cameras, or 4K footage, cloud costs scale quickly. AU$300-500/year for a 4-camera system is common. A NAS with large drives has higher upfront cost (~AU$600-1,100 depending on capacity) but no ongoing fees, and can store months of footage. NBN upload speed is also a factor: uploading 4K CCTV footage continuously to cloud is demanding on most Australian connections.
Want to calculate exactly how much storage your camera system needs? The NVR Storage Calculator gives precise figures for your setup.
Calculate NVR Storage →