The Hidden Cost of Duplicate Images: What the Numbers Tell Us About Sydney's Digital Storage Problem

Duplicate image files now account for a measurable share of wasted digital storage across Australian institutions — and Sydney's rapid digitisation push is making the problem harder to ignore. Across local government, property development and cultural sectors, the same photograph, scan or rendered blueprint gets uploaded, emailed, re-saved and archived multiple times, each copy drawing on server capacity that costs real money.

The timing matters. NSW is mid-way through an aggressive push to digitise planning and development records, partly to cut approval times for housing — the state government's single most contested political issue heading into 2027. When duplicate images clog document management systems, searches slow, file versioning breaks down, and the efficiency gains that justified digitisation in the first place erode.

What the Storage Numbers Actually Look Like

Research published by data management firm Veritas Technologies has found that, on average, roughly 52 percent of all data stored by organisations globally is classified as redundant, obsolete or trivial — a category in which duplicate image files feature prominently. For large councils managing planning portals, heritage registers and infrastructure photo libraries, that translates directly into procurement costs: enterprise cloud storage on platforms such as Microsoft Azure or AWS S3 billed to NSW government entities typically runs between $0.023 and $0.025 per gigabyte per month at standard tier, meaning a single council holding two terabytes of duplicated image data could be paying more than $600 a year for files it already has.

The City of Sydney Council, which manages one of the densest development pipelines in the country along the George Street corridor and around Green Square, maintains a public development application portal where submitted image sets — architectural renders, site photographs, shadow diagrams — are uploaded in bulk. Applicants regularly re-submit amended image files without removing the originals, which means the same view of a proposed tower on Botany Road or a heritage facade in Surry Hills can exist in three or four versions simultaneously within the same DA folder.

The NSW State Archives and Records Authority, based at Western Sydney University's Parramatta campus, handles digitised records going back to colonial-era documents. Archivists have publicly noted that image duplication is among the more persistent challenges in large-scale digitisation projects, particularly when multiple staff members scan the same physical document before a deduplication protocol is applied.

Western Sydney's Growth Adding Pressure

The scale of the problem grows with population. Western Sydney — where greenfield development around the Aerotropolis near Badgerys Creek is generating tens of thousands of new planning documents annually — is producing image-heavy records at a pace that legacy deduplication processes were not designed to handle. A single precinct plan for a new suburb in the Campbelltown or Liverpool local government areas can include hundreds of georeferenced aerial photographs, many of which overlap with imagery already held by Transport for NSW or the Department of Planning.

Deduplication software — tools that use hash-matching or perceptual image comparison algorithms to identify near-identical files — is commercially available and widely used in enterprise IT. Products from vendors including Canto, Bynder and open-source tools such as dupeGuru can identify duplicates at scale. Licensing costs for enterprise-grade digital asset management platforms typically start around $10,000 per year for mid-sized organisations, though open-source alternatives carry no licensing fee.

For smaller councils in Sydney's inner west or northern beaches, where IT teams may number fewer than a dozen people, the practical fix is often manual: a periodic audit of the shared drive, a new naming convention, a stricter upload policy on the DA portal. The City of Parramatta Council updated its document submission guidelines in late 2024 specifically to address version control on planning images, according to its publicly available records management framework.

The practical steps for any Sydney organisation dealing with the issue are well-established. Conduct a storage audit using free tools to quantify duplication first. Set a mandatory naming convention that embeds a date and version number before any file reaches a shared system. Review cloud storage tier settings — keeping duplicate archives on hot storage when cold or archive tier would cost a fraction of the price is a common and avoidable expense. And build a deduplication pass into any new digitisation workflow before files are ingested, not after the backlog has grown to a size that makes cleaning it up a project in itself.