The Hidden Numbers Behind Melbourne's Duplicate Image Problem

Melbourne's public and private sector organisations collectively manage tens of millions of digital image files, and a growing body of internal audit data suggests that somewhere between 30 and 40 per cent of those files are exact or near-exact duplicates consuming storage, distorting records, and draining IT budgets. The scale of the problem is not abstract. It shows up in procurement costs, in archival errors, and increasingly in the databases that underpin decisions about housing, planning, and public services across Victoria.

The issue has sharpened in 2026 because of two converging pressures. Victoria's housing density reforms — now moving through the Department of Transport and Planning's rezoning pipeline — require councils to publish accurate, deduplicated property imagery as part of the permit and planning portal process. At the same time, the Victorian Government's Digital Strategy, which set a 2025 target for agencies to rationalise cloud storage expenditure, has pushed department heads to look hard at what is actually sitting on their servers.

What the Numbers Actually Show

Storage costs in Australian enterprise environments now average around $0.023 per gigabyte per month on mainstream cloud platforms, according to publicly available pricing from Microsoft Azure's Australian East region as of June 2026. A local government body holding 500,000 images — not unusual for a mid-sized Melbourne council — can find that duplicate files inflate that footprint by 150,000 files or more, adding hundreds of dollars monthly in unnecessary costs before administrative overhead is counted.

The City of Yarra, which covers Fitzroy, Collingwood, and Richmond, has been running an internal records digitisation program through its library and heritage services branch since mid-2024. Inner-city councils with older built-environment photography collections are particularly exposed: heritage documentation projects often result in the same building facade being photographed, uploaded, and catalogued multiple times across different departmental workflows, with no automated deduplication step applied at ingestion.

The State Library of Victoria on Swanston Street, one of the largest digital image repositories in the southern hemisphere, holds more than 800,000 digitised photographs in its public-access collections. Deduplication methodology at major cultural institutions has improved, but the library's own documentation acknowledges that legacy collection transfers — particularly material absorbed from suburban and regional libraries between 2018 and 2022 — introduced redundant files that require manual review.

Real Estate Portals and the Cost of Repetition

The problem is not confined to government. Melbourne's residential property market, where Domain and realestate.com.au together carry listings for tens of thousands of Victorian properties at any given time, generates its own duplication crisis. A typical three-bedroom terrace in Northcote or Brunswick listed across multiple agencies can appear with the same six or eight photographs uploaded independently by each agent, creating duplicate entries in the underlying image databases. Industry estimates — drawn from publicly available figures in the PropTech sector — suggest Australian real estate portals spend upward of $2 million annually on storage that could be eliminated through automated hash-matching and deduplication tools already on the market.

Melbourne-based software firm Squirrel Street — a boutique PropTech consultancy operating out of the Cremorne technology precinct on Church Street — has publicly discussed the use of perceptual hashing algorithms to identify near-duplicate images in real estate databases. The technique compares image fingerprints rather than pixel-by-pixel data, meaning that slightly cropped or brightness-adjusted versions of the same photograph still register as duplicates. Adoption across Victorian councils and government agencies remains patchy, largely because procurement rules require a formal tender process for any software contract above $150,000.

For organisations looking to get ahead of the problem, the path is straightforward in principle if slow in practice. Internal audits using free or low-cost tools such as dupeGuru can establish a baseline file count and duplication rate within days. From there, a formal deduplication policy — specifying which version of a file becomes the canonical record — needs sign-off from both IT and records management teams before automated deletion can proceed. Victorian agencies operating under the Public Records Act 1973 must ensure that any deletion of duplicate records is documented, even where the files are identical. The Department of Premier and Cabinet's Cyber Strategy unit has flagged deduplication hygiene as a line item in guidance circulated to agencies in the first quarter of 2026. The cost of ignoring it, the data now makes clear, compounds every month.