Sydney Tackles Duplicate Image Sprawl Across City Systems — But Rivals Are Moving Faster

Sydney's government agencies and public cultural institutions collectively hold tens of millions of digital image files, and a growing share of them are duplicates — the same photograph, scan, or graphic stored multiple times across different servers, departments, and cloud platforms. The City of Sydney Council, Transport for NSW, and the State Library of New South Wales are among the organisations wrestling with the problem, which inflates storage budgets, muddies public records requests, and can delay procurement and planning approvals when staff cannot locate definitive file versions.

The issue has sharpened in 2026 for a specific reason. NSW government agencies are midway through a consolidation mandate tied to the state's Digital.NSW strategy, which set a July 2026 deadline for departments to audit cloud storage contracts and reduce redundant data holdings. The audit requirement has forced agencies to confront just how cluttered their digital libraries have become after years of decentralised file-sharing, staff turnover, and emergency remote-work arrangements during the pandemic years of 2020 and 2021, when documents were routinely saved to personal drives and then re-uploaded to shared platforms.

What Sydney Is Actually Doing About It

Transport for NSW, which manages image assets across the entire Sydney Metro and bus network — including the Metro West construction corridor running from Sydney CBD to Westmead — began a deduplication program in late 2024 using automated hash-matching software. The technology identifies files that are byte-for-byte identical, flagging them for review before deletion. The agency declined to provide current figures on storage savings, but the approach itself is now standard across several NSW government entities.

The State Library on Macquarie Street in the CBD has a more complex version of the challenge: digitised historical photographs, many from the collection's 19th-century holdings, were scanned at different resolutions at different points in time. That means two files can depict the same image but not be byte-for-byte duplicates, which defeats basic hash-matching tools. Librarians there have been piloting perceptual hashing — a technique that compares visual similarity rather than raw data — as part of a broader digitisation review that began in March 2025. The Library's Dixson Collection alone runs to hundreds of thousands of photographic items.

In Parramatta, Western Sydney's administrative hub, the local council has moved to a centralised digital asset management platform, consolidating files previously scattered across planning, events, and communications teams. Staff there say the shift has reduced inter-departmental file requests, though the council has not published before-and-after storage metrics.

How Sydney Compares to London, Singapore, and Amsterdam

Sydney's progress is real but uneven, and comparable cities elsewhere have moved with more institutional coordination. Singapore's Smart Nation initiative had government agencies operating under unified digital asset governance frameworks by 2023, with deduplication built into procurement specifications for any cloud storage contract above SGD 50,000. Amsterdam's municipal archive — the Stadsarchief, covering a city of roughly 900,000 people — completed a full image deduplication audit of its 4.5 million digital holdings in 2024, using a combination of perceptual hashing and manual review for contested cases. London's situation more closely mirrors Sydney's: Transport for London and the Greater London Authority have separate digital asset systems that are not yet fully integrated, and a 2025 review by the UK's National Audit Office pointed to duplicated storage as a contributor to avoidable IT costs across central government departments.

What separates Singapore and Amsterdam from Sydney is not the technology — the tools are largely the same — but the mandate structure. Both cities required cross-agency data governance standards before the deduplication work began, rather than leaving each department to solve the problem independently. Sydney's current approach is predominantly agency-by-agency, meaning the City of Sydney Council, Transport for NSW, and NSW Health are all running separate programs with no shared deduplication ledger or reported outcomes framework.

For residents and businesses that interact with council planning portals in suburbs like Glebe, Chippendale, or Penrith, the practical consequence is occasional delays when staff cannot quickly confirm whether an image in a development application file is the approved final version or an earlier draft. For journalists and researchers lodging GIPA requests — NSW's equivalent of freedom of information — duplicate files can mean longer processing times as staff sort through redundant records.

The Digital.NSW deadline passed on July 1. Agencies now have until the end of September 2026 to report audit outcomes to the Department of Customer Service. Whether those reports will be made public — and whether they will include hard numbers on duplicate file volumes and storage costs — will determine how clearly Sydney can measure its own progress against the cities that got there first.