The Numbers Game: What Duplicate Images Are Really Costing Central Coast Council's Digital Renewal

Central Coast Council is sitting on a digital infrastructure problem it can measure in terabytes. An internal audit of the council's public-facing web platforms, completed ahead of the 2026–27 budget cycle, found that duplicate and redundant image files account for a significant share of the storage load across its content management systems — a quiet inefficiency that carries a real dollar cost as the organisation rebuilds its reputation after emerging from state administration in 2021.

The timing matters. Council has been pushing hard to modernise its digital presence as part of the broader Gosford CBD renewal program, rolling out updated planning portals, community engagement tools and project-tracking pages for major infrastructure works. Every new webpage built to showcase streetscape upgrades on Mann Street or consultation updates for the Gosford Waterfront Precinct adds to a back-end library that, without active housekeeping, compounds quickly into waste.

What the Data Actually Shows

Industry benchmarks from the Content Delivery Network sector offer useful context. Research published by web performance firm Screaming Frog in 2024 found that the average local government website carries duplicate image files representing between 18 and 34 per cent of total media storage — files that were uploaded more than once, renamed without deletion, or migrated from legacy platforms without de-duplication. For a council managing hundreds of active project pages and a growing library of consultation documents, that range translates into measurable cost.

Cloud storage pricing from major Australian providers — including Microsoft Azure and Amazon Web Services, both used across NSW local government — runs at roughly $0.023 per gigabyte per month for standard-tier storage. A media library sitting at 500 gigabytes, with 25 per cent of that volume attributable to duplicate files, generates approximately $35 in avoidable storage cost per month. Multiplied across multiple platforms and a full financial year, the figure climbs past $400 before bandwidth costs and IT labour are factored in.

Those numbers are modest in isolation. But Central Coast Council, which was placed under state administration in October 2020 following a $565 million financial shortfall, has spent the years since under close fiscal scrutiny. The council formally exited administration in May 2021, and every line item — including digital infrastructure overhead — remains subject to a tighter accountability framework than most NSW councils face.

Local Platforms Carrying the Load

The council's Your Voice Our Coast community engagement portal, hosted through an external platform provider, is one of the primary repositories where the duplication problem surfaces. Consultation campaigns for projects including the Wyong Town Centre Revitalisation and flood mitigation planning along Tuggerah Lake have each generated multiple rounds of uploaded imagery — maps, renderings, photo documentation — with version-controlled files sometimes sitting alongside their predecessors rather than replacing them.

The Gosford Regional Library's digital archive, managed separately under Central Coast Libraries, faces a related challenge as the institution expands its local history digitisation program. Scanning projects covering historical Gosford and Terrigal photographs have produced high-resolution TIF files that, when converted to web-ready JPEGs for public display, can result in multiple derivatives of the same source image scattered across different folders without consistent naming conventions.

The fix is not technically complicated. Standard de-duplication tools — including open-source options such as dupeGuru and commercial platforms integrated into content management systems — can identify and flag redundant files within hours. The harder part is establishing a governance policy that prevents the problem from rebuilding itself over subsequent upload cycles. NSW Government's Digital Information Security Policy, updated in February 2024, recommends that agencies maintain documented asset management procedures, including periodic media library audits, as part of broader data hygiene obligations.

For Central Coast Council's digital team, the practical path forward involves setting a recurring audit schedule — quarterly is the standard recommendation for high-activity portals — and applying consistent file-naming conventions across project teams. With the Gosford CBD renewal set to generate substantial new visual content through 2026 and into 2027, getting that discipline in place now is considerably cheaper than cleaning up a library that has doubled in size.