Melbourne's Digital Archives Are Drowning in Duplicate Images — and the Numbers Reveal Why

Melbourne's public cultural sector is sitting on a quiet data crisis. Councils, galleries and state government agencies across Victoria are collectively storing tens of thousands of duplicate digital images — the same photograph saved under different filenames, across different servers, sometimes across different departments — and the bill is mounting. Digital asset managers and archivists who work with these institutions say the problem has reached a point where it cannot be ignored.

The issue matters now because Victoria's public sector is mid-way through a digitalisation push that accelerated sharply after 2020. The Public Record Office Victoria, based in North Melbourne, has been processing backlogs of physical records while simultaneously inheriting legacy digital libraries from agencies that merged or restructured. When organisations consolidate their holdings without first auditing for duplicates, they carry the redundancy forward and pay for it indefinitely.

What the Numbers Actually Look Like

Industry benchmarks from digital asset management providers — including figures cited by the Australian Society of Archivists in guidance published in 2024 — suggest that unmanaged institutional image libraries can contain duplicate rates of between 20 and 40 percent of total file volume. Apply that range to a mid-sized council library of, say, 500,000 image files, and you are looking at up to 200,000 redundant files consuming storage that costs money every month. Cloud storage pricing for enterprise clients in Australia typically sits between $0.02 and $0.05 per gigabyte per month depending on the provider and contract tier. A single uncompressed archival TIFF image can run to 100 megabytes or more. The arithmetic adds up fast.

The City of Melbourne, which manages photographic records through its library services arm at the Melbourne Town Hall precinct on Swanston Street, and the State Library Victoria on La Trobe Street, both maintain extensive digitised collections. Neither institution has publicly disclosed the scale of any duplicate-image problem in their holdings, but professionals working in the sector describe the challenge of inherited duplicates — images ingested from multiple sources, each catalogued separately — as a routine operational headache that consumes hours of staff time each week.

Automated deduplication software has existed for years, but adoption across Victorian local government has been patchy. Some tools identify exact binary duplicates — pixel-for-pixel identical files — while more sophisticated platforms use perceptual hashing algorithms to flag near-duplicates: the same photograph saved at different resolutions, with different colour profiles, or with minor crops applied. The distinction matters enormously for archives, where a slightly different scan of a historical print may carry genuine archival value while a resaved JPEG of a staff headshot does not.

The Local Push for Smarter Systems

The Victorian Government's Digital Strategy, which sets targets running through to 2027, calls on agencies to improve data quality and reduce unnecessary storage overhead. That framing gives archivists and IT managers inside the bureaucracy a policy handle to push deduplication projects up the priority list. Some City of Yarra and City of Moreland council IT teams have quietly piloted deduplication audits over the past 18 months, according to procurement records listed on the Victorian Government Tenders platform, though the scope of those projects has not been publicly reported in detail.

For cultural institutions in particular — galleries, libraries, performing arts organisations — the stakes go beyond storage costs. The National Gallery of Victoria, on St Kilda Road, and smaller venue-based organisations like Arts Centre Melbourne in Southbank hold photographic documentation of performances, exhibitions and acquisitions stretching back decades. Duplicate records in those collections can create genuine provenance confusion: two slightly different records for the same image may carry conflicting metadata, muddying the historical record.

Organisations that want to get ahead of the problem have a practical starting point: a full asset audit before any cloud migration or system upgrade, not after. Running a deduplication pass before ingesting legacy files into a new system prevents the problem from compounding. The tools to do it — from open-source options to enterprise platforms — are available. The bottleneck, consistently, is allocating the staff time to validate what the software flags and make the call on what to keep.