The Hidden Cost of Duplicate Images: What the Numbers Reveal About Melbourne's Wasted Digital Storage

Melbourne's public sector is sitting on a digital hoarding problem it can barely quantify. Duplicate image files — identical or near-identical photos stored multiple times across content management systems — now account for an estimated 30 to 40 percent of total media library bloat in mid-to-large organisations, according to industry analysis published by the Australian Information Industry Association in its 2025 Digital Asset Management Benchmarking Report. For a city whose government agencies, arts bodies and universities collectively manage tens of millions of digital assets, the accumulated waste runs into serious money.

The timing matters. The Victorian Government's Digital Strategy 2023–2028 commits agencies to cloud-first infrastructure, meaning every redundant megabyte eventually attracts a recurring cloud storage fee. Amazon Web Services S3 standard storage, the most common tier used by Australian government contractors, was priced at approximately USD $0.025 per gigabyte per month as of early 2026. That sounds negligible until an organisation discovers it has 200,000 duplicate image files averaging 4 megabytes each — a scenario that translates to roughly 800 gigabytes of pure waste, costing around AUD $30 a month indefinitely, before factoring in egress, redundancy layers or staff time spent managing the clutter.

Where the Duplicates Accumulate

The problem concentrates wherever multiple staff upload assets independently without a centralised check. The City of Melbourne's open data portal, which lists thousands of image assets tied to civic projects and planning documents, is one local example of the scale involved — though the council has not publicly released figures on internal duplication rates. The National Gallery of Victoria on St Kilda Road, which digitised large portions of its 75,000-plus collection for online access, has spoken publicly about the complexity of managing digital surrogates, where a single artwork may generate dozens of crop variants and resolution versions, each potentially saved more than once by different curatorial teams.

State Library Victoria on Swanston Street faces a similar structural challenge. Its digitisation program has produced millions of scanned items, and without automated deduplication tooling running at the point of ingestion, libraries of that scale routinely accumulate duplicate derivatives. A 2024 survey by the Digital Preservation Coalition found that 61 percent of cultural heritage institutions reported discovering significant volumes of duplicate or near-duplicate files during storage audits — and fewer than a quarter had automated systems in place to catch them before storage costs compounded.

In the commercial property and construction sector, the duplication problem takes a different shape. Firms operating out of Southbank and Docklands — Melbourne's two largest concentrations of architecture and engineering firms — routinely exchange project photography across email, SharePoint and project management platforms like Procore simultaneously. A single site photo taken on a Thursday morning can end up stored in six or seven locations by Friday, none of them tagged identically, making automated detection harder. The CFMEU, whose members work the sites being photographed, has no direct stake in the data management question, but the construction industry's accelerating shift to digital-first documentation has made the volume problem acute.

What Organisations Can Do Now

Automated deduplication tools have become significantly cheaper. Open-source options like dupeGuru have been available for years, while enterprise-grade platforms such as Bynder and Canto — both with Australian client bases — offer perceptual hashing, a technique that identifies visually similar images even when file names or metadata differ. Perceptual hashing compares images pixel-by-pixel via a compressed fingerprint, flagging matches above a configurable similarity threshold, typically set between 85 and 95 percent.

The practical first step for any Melbourne organisation is a storage audit before the next budget cycle. With the Victorian Government's financial year having turned on July 1, 2026, agencies renewing cloud infrastructure contracts now have a narrow window to renegotiate storage tiers downward if they can demonstrate reduced footprint. An audit of even a 10-terabyte media library, priced at current consultant rates of roughly $150 to $200 per hour for a junior digital archivist, will typically pay for itself within two billing cycles if duplication rates match industry averages. The maths is not complicated. The will to act, historically, has been the harder part.