The Hidden Cost of Duplicate Images: What Melbourne's Digital Archive Problem Actually Looks Like in Numbers

Melbourne's public institutions are sitting on millions of duplicate image files they cannot easily identify, and the storage bills are climbing. Across local government, university libraries, and cultural organisations, the problem of redundant digital assets — the same photograph, scan, or graphic saved multiple times under different file names — has grown from a minor housekeeping headache into a measurable budget problem.

The timing matters because Victoria's digital infrastructure spending is under renewed scrutiny. The Allan government's 2025–26 state budget allocated funding toward digitisation of public records, and several Melbourne institutions are in the middle of multi-year projects to migrate legacy collections online. When those pipelines are dirty — clogged with duplicates — the cost multiplies fast.

What the Numbers Actually Show

Industry benchmarks from digital asset management consultancies suggest that in large unmanaged image libraries, duplicate or near-duplicate files can account for between 25 and 40 percent of total stored data. For an organisation holding, say, 10 terabytes of image assets — a modest figure for a mid-sized cultural institution — that translates to up to 4 terabytes of redundant storage. At current AWS S3 standard rates of roughly USD $0.023 per gigabyte per month, that waste alone can cost thousands of dollars annually before factoring in backup, bandwidth, or staff time spent managing the mess.

The State Library of Victoria on La Trobe Street, which holds one of the largest publicly accessible digitised photograph collections in the southern hemisphere, runs deduplication processes as part of its digital preservation workflow. The library does not publicly report the volume of duplicates it removes, but archivists working in the sector describe the problem as endemic in collections that grew rapidly during COVID-era digitisation pushes between 2020 and 2022, when quantity was prioritised over cataloguing hygiene.

The City of Melbourne's Open Data platform, which hosts thousands of image assets tied to planning documents and heritage records, has similarly faced internal reviews of asset organisation. Council IT procurement records, which are publicly available through the council's transparency portal, show recurring line items for storage infrastructure upgrades, though the records do not break out duplication as a specific cost driver.

Where Melbourne Organisations Are Feeling It Most

Arts organisations concentrated around Southbank and Collingwood are among the most exposed. Smaller groups — gallery collectives, music venues, community media producers — rarely have the budget for enterprise-grade digital asset management software, which can run from $500 to well over $5,000 per year depending on the platform and user count. Many rely on shared Dropbox or Google Drive folders, where duplicate images accumulate invisibly across team members' uploads.

RMIT University's libraries, which serve students across the City campus on Swanston Street and at Brunswick, have invested in ExLibris Rosetta, a digital preservation platform designed partly to handle deduplication at scale. The university does not publish figures on how many redundant files the system flags, but the platform's own published case studies from comparable institutions report deduplication rates eliminating 15 to 30 percent of stored objects in initial migration audits.

The practical mechanics of duplicate image replacement — finding the canonical version of a file, retiring the rest, and updating every reference that pointed to an old copy — is not glamorous work. It requires hash-checking tools, clear file governance policies, and often a dedicated staff member or contractor to run the cleanup. For institutions without that capacity, the duplicates simply accumulate.

For Melbourne organisations looking to get ahead of the problem, the Australian Society of Archivists recommends beginning any digitisation project with a deduplication audit before migration, not after. Free tools such as dupeGuru can scan local drives and flag identical or visually similar files for review. Cloud providers including Google and Microsoft now offer built-in duplication detection in their enterprise storage tiers, though the features require active configuration. The longer institutions wait to address existing redundancy, the more expensive the cleanup becomes — both in storage costs and in staff hours spent unravelling a filing system that nobody designed and everybody added to.