The Numbers Behind Canberra's Duplicate Image Problem: What the Data Actually Shows

Canberra's public sector holds more duplicate digital images than almost any other city in Australia — and a growing body of internal audits and digital asset reviews is beginning to put hard numbers on the mess. Across the Australian Public Service, duplicated image files account for an estimated 20 to 30 percent of total unstructured storage consumption, according to digital records management guidance published by the National Archives of Australia. That translates, at current enterprise cloud storage rates of roughly $25 to $40 per gigabyte per year, into hundreds of thousands of dollars in avoidable annual expenditure for mid-sized agencies alone.

The issue has sharpened in mid-2026 for several reasons. The Australian Government's Digital and ICT Investment Oversight Framework, updated in late 2025, now requires agencies with annual digital budgets above $10 million to conduct formal data deduplication reviews before any storage uplift is approved. Many departments based in Barton, Woden and the Civic precinct are approaching their next budget cycle review in September, making July a crunch month for compliance teams.

What the Local Numbers Look Like

The Australian National University's Digital Humanities Hub on Acton Peninsula ran its own internal audit in early 2026 and found that roughly 34 percent of images held in its research repository were exact or near-exact duplicates — a figure that project librarians flagged as broadly consistent with what peer institutions were finding elsewhere. The University of Canberra's library and digital collections team reported a similar exercise across its Bruce campus holdings, identifying duplicate image sets concentrated in student media projects and archival digitisation runs from 2018 to 2022.

Outside universities, the problem is most acute in agencies that process high volumes of field photography — think the Department of Infrastructure's road and asset inspection workflows, or the ACT Government's planning directorate photographing development applications across growth corridors in Gungahlin and Belconnen. A typical planning site visit can generate 60 to 120 photographs, a meaningful proportion of which duplicate prior inspection imagery. Multiply that across thousands of applications lodged annually through the ACT Planning Portal and the redundancy compounds quickly.

Deduplication software vendors operating in the Australian government market — several of whom have offices on Constitution Avenue in Reid — typically quote storage savings of 40 to 70 percent for image-heavy workloads, depending on file type and workflow structure. JPEG and RAW camera files deduplicate less efficiently than text-based formats, but perceptual hashing tools, which identify visually similar rather than byte-identical images, have pushed effective reduction rates higher over the past three years.

Why Replacement Matters, Not Just Deletion

Simply deleting duplicates creates its own risks. The National Archives guidance is explicit that agencies must retain audit trails and cannot unilaterally destroy records that may fall under the Archives Act 1983, even if those records appear redundant. The practical answer — endorsed in the Digital Continuity 2030 policy — is structured replacement: a process where duplicates are consolidated into a single canonical file, with metadata pointers replacing the physical copies across whatever content management system the agency uses.

Commonwealth departments using platforms like HPE Content Manager or Microsoft SharePoint Online can automate much of this through native deduplication features, though integration with legacy image libraries held on-premises in older Canberra data centres remains a manual headache for many IT teams.

For ACT government agencies and Canberra-based institutions looking at this now, the practical first step is a baseline count — most storage systems can generate a duplicate report within hours. The Digital Transformation Agency published updated guidance on this process in March 2026, available through its website. Agencies that complete a review before the September budget window will be better placed to argue against storage uplift requests that might otherwise sail through unexamined. The dollars are real, the tools exist, and the audit clock is running.