Melbourne's Digital Archives Are Riddled With Duplicate Images — and the Numbers Reveal How Bad It's Got

Melbourne's cultural and government institutions are sitting on tens of thousands of duplicate digital images — redundant files that are consuming server space, distorting collection counts, and quietly draining technology budgets. The problem is bigger than most administrators publicly acknowledge, and a cluster of data audits completed in the first half of 2026 is starting to put hard numbers on the scale of the waste.

The issue has sharpened in recent months because the Victorian Government's $68 million Digital Transformation Strategy, which includes a digitisation push for public records and cultural assets, has forced institutions to actually count what they hold. What they found, in several cases, was that between 20 and 40 per cent of image files across networked storage systems were either exact or near-exact duplicates — identical scans filed twice, or slightly re-cropped versions of the same photograph catalogued as distinct entries.

What the audits are actually finding

The State Library Victoria, located on Swanston Street in the CBD, manages one of the largest public image repositories in the country. Its digitised collection runs into the millions of individual files. Library Victoria's internal collection management documentation — available through the institution's public annual reporting — has previously noted the challenge of deduplication as collections migrate between successive cataloguing systems. When older databases are merged, duplicate entries compound rapidly.

At the City of Melbourne's own archives, held partly at the North Melbourne Town Hall on Queensberry Street, staff have been working through a two-year data remediation project that began in March 2025. The project targets legacy scans from pre-2010 digitisation drives, when file-naming conventions were inconsistent and quality-control checks were less automated. Early findings from that project, presented to a council infrastructure committee in April 2026, indicated that storage consumption attributed to confirmed duplicates had reached several terabytes — equivalent, in practical terms, to years' worth of new digitisation work sitting idle on drives already full of redundant data.

The financial dimension is not trivial. Enterprise cloud storage for large institutions in Victoria is typically contracted at rates between $0.02 and $0.05 per gigabyte per month, depending on redundancy tiers and the vendor. For an institution managing 50 terabytes — a realistic figure for a mid-size metropolitan archive — duplicate bloat at even 25 per cent means paying to store roughly 12 terabytes of files that serve no collection purpose. Across a 12-month contract, that translates to thousands of dollars in avoidable expenditure before staff labour costs are factored in.

Why deduplication keeps getting deferred

The core difficulty is not technical — software tools for identifying perceptual duplicates (images that are near-identical rather than bit-for-bit copies) have existed since the early 2010s. The problem is workflow and risk. Automated deduplication tools can flag a historically significant photograph and a slightly differently cropped version of the same image as duplicates, when curatorial staff may actually want to retain both for provenance reasons. That ambiguity means human review is required, and human review is expensive and slow.

The Australian Library and Information Association, which is headquartered in Canberra but has an active Victorian chapter with regular events in Melbourne, has flagged the deduplication problem in its professional development programming for 2026. Its guidance to member institutions recommends a staged approach: automated flagging first, followed by tiered human review prioritised by collection significance, before any files are permanently removed.

For smaller community organisations — the kind running oral history or migrant heritage photo archives in suburbs like Footscray and Dandenong — the resources for even the automated stage are often absent. A number of these groups have applied under Creative Victoria's Community Arts and Cultural Development funding stream, which had a 2026 application round closing in May, to cover digitisation and collection management costs. Whether deduplication work qualifies under those grant criteria has become a practical question for several applicants.

Institutions that have not yet audited their image holdings should treat the first step as straightforward: run a hash-based deduplication check across file storage before the next storage contract renewal. For the City of Melbourne's project, that renewal falls in late 2026. Getting the numbers right before then is the difference between paying for what you need and paying for what you forgot you already had.