Newcastle City Council confirmed this week that its digital asset management program — covering everything from planning portal imagery to heritage archive photography — has flagged more than 14,000 duplicate image files accumulated across municipal systems since a migration to cloud-based storage began in late 2023. The figure, drawn from an internal audit circulated to council's information governance committee in June 2026, puts Newcastle in the company of mid-sized cities globally that are only now confronting the practical cost of years of unmanaged digital duplication.
The timing matters. Across the Hunter region, digitisation has accelerated sharply as institutions pivot away from paper-heavy processes tied to the coal industry's contraction. The University of Newcastle's Special Collections unit, based on the Callaghan campus, has been digitising materials from Hunter Valley mining heritage collections since 2021. When those workflows scale without strict metadata protocols, duplicate images proliferate — sometimes the same photograph ingested three or four times under different file names. Storage costs follow. So does the risk that researchers and planners pull the wrong version of a document when decisions need to be made.
What Newcastle Is Doing Differently
The council's approach leans on automated perceptual hashing — a technique that compares image content rather than file names — deployed through a contract with a Sydney-based vendor, Imagen Technology Solutions, signed in March 2026. The tool is running across council's shared drives on Laman Street and the planning department's document repository, which holds aerial surveys of suburbs from Merewether to Mayfield dating back to 2009. According to the audit summary, the first pass identified duplicates accounting for roughly 2.3 terabytes of redundant data.
The University of Newcastle is pursuing a parallel but distinct method. Its library digital services team has been working since February 2026 with the HASS (Humanities, Arts and Social Sciences) faculty to apply the open-source tool DuplicateImageFinder to the Auchmuty Library's digitised photograph collections before those assets feed into a Hunter regional history portal expected to launch by December. The university's approach is volunteer-intensive and slower, but it allows human curators to adjudicate cases where two images look nearly identical but carry different provenance — a distinction that matters enormously for historical research.
Those two models — automated-commercial versus open-source-curatorial — map almost exactly onto the divide visible in comparable cities. Geelong in Victoria contracted a commercial deduplication service for its council records in 2024 and cleared its backlog in under eight weeks, but archivists there later identified a small number of cases where perceptually similar images with different metadata had been incorrectly merged. Dunedin, New Zealand, took the curatorial route for its Hocken Collections digitisation project and avoided that problem, at the cost of a process that stretched across 18 months. Newcastle appears to be running both tracks simultaneously, by accident more than design.
The Broader Picture and What Comes Next
Globally, the problem is not trivial. A 2024 report from the International Council on Archives estimated that unnecessary duplicate digital files account for between 18 and 24 percent of storage costs in public sector archives across OECD nations. For a regional council like Newcastle, even modest savings on cloud storage contracts — which the council's current arrangement with Microsoft Azure prices at roughly $0.023 per gigabyte per month for the cool-tier tier applicable to archival material — can compound meaningfully across years.
The practical stakes extend beyond budget lines. Newcastle's renewable hydrogen zone planning, coordinated through the Hunter Hydrogen Network based in Newcastle's CBD on Hunter Street, relies on accurate, non-duplicated aerial and survey imagery for site assessments around the Port of Newcastle precinct. Feeding a planning database with redundant or mislabelled images creates decision-making risk that is difficult to quantify but straightforward to prevent.
Council's information governance committee is expected to receive a second-phase audit report in September 2026, at which point a decision on whether to extend the Imagen contract or shift to an open-source alternative will need to be made. The University of Newcastle's portal launch deadline means its own deduplication work must be substantially complete by October. For anyone who has tried to find a specific 1980s photograph of the BHP steelworks site in Mayfield and pulled up a dozen near-identical scans, the stakes feel entirely concrete.