Canberra's Digital Archives Have a Duplicate Image Problem. Here's What Experts and Officials Are Saying About Fixing It.

Duplicate images are quietly eating into the storage budgets and search accuracy of some of Canberra's most significant public institutions, and the people responsible for managing those collections say the problem has reached a point where it can no longer be patched over manually.

The issue sits at the intersection of two pressures that have been building for years: the federal government's push to digitise paper records faster, and the surge in cloud storage costs that have made redundant files an expensive liability rather than a harmless quirk. For a city whose economy is built on public administration and research, getting digital asset management right carries real institutional weight.

What the Institutions Are Dealing With

The National Archives of Australia, based on Queen Victoria Terrace in Parkes, holds tens of millions of digitised records. Institutions of that scale routinely accumulate duplicate image files through batch scanning workflows, agency transfers, and successive format migrations — the same photograph or document page ingested multiple times under different filenames or metadata tags. The Australian National University's Chifley Library precinct faces a parallel challenge managing image assets across its research data repositories, where datasets contributed by different faculties sometimes overlap without any automated deduplication step in the ingest pipeline.

Digital archivists and collection managers across the sector broadly agree that the traditional approach — flagging duplicates by filename or file size alone — misses a large proportion of functional duplicates, where the same image has been slightly cropped, re-exported at a different resolution, or had its colour profile altered. Perceptual hashing, a technique that generates a fingerprint based on an image's visual content rather than its file properties, is increasingly the recommended alternative. Several Australian university libraries began piloting perceptual hashing tools in 2024 and 2025, with the aim of clearing legacy backlogs before storage contract renewals.

Collection managers at institutions that have gone through a deduplication process consistently report that the proportion of genuinely redundant files surprises even experienced archivists. Common estimates from published case studies at comparable institutions internationally suggest duplicate rates of between eight and twenty per cent of total image holdings, depending on how many format migrations the collection has been through.

The Policy and Procurement Dimension

For ACT government agencies and Commonwealth bodies headquartered in Civic, Barton, and Symonston, the procurement question is now live. The Australian Government's Digital Transformation Agency has been updating guidance on records management interoperability, and storage costs on whole-of-government cloud contracts are reviewed annually. Agencies that can demonstrate leaner, well-governed digital asset inventories are better positioned in those reviews.

The University of Canberra's library and information science program at the Bruce campus has incorporated digital deduplication into its postgraduate curriculum, reflecting employer demand from both federal agencies and ACT government bodies. Graduates entering the APS in 2025 and 2026 are arriving with more practical exposure to automated collection management tools than their predecessors.

The practical advice from collection professionals is consistent on a few points. First, any deduplication project should begin with a full inventory audit rather than running automated deletion tools directly against a live collection — the cost of accidentally removing a record with archival significance outweighs the storage savings many times over. Second, institutions should set retention policies before deduplication, not after, so that the tool has a clear decision rule when it surfaces a match. Third, the replacement image — the one kept after duplicates are cleared — should be the highest-resolution, best-documented version, with provenance metadata intact.

For Canberra's public institutions, the window to address this systematically is narrowing. Storage costs are not falling as steeply as they once did, digitisation programs are accelerating, and the 2027 federal budget cycle will put renewed pressure on agencies to demonstrate digital efficiency. The organisations that start their audits now will be in a considerably stronger position than those that wait for a procurement crisis to force the issue.