By the Numbers: What Bendigo's Duplicate Image Problem is Really Costing Local Archives

Bendigo's network of libraries, galleries and historical societies holds tens of thousands of digitised photographs — and a growing share of them exist in duplicate, triplicate, or worse. The problem of redundant image files has moved from an IT nuisance into a measurable financial burden, one that regional institutions are only now beginning to quantify properly.

The timing matters. Across Victoria's regional centres, state funding rounds tied to the Public Record Office Victoria's digitisation strategy close in September 2026, meaning institutions must demonstrate efficient storage management to remain eligible. For Bendigo, where several major collections are mid-project, getting a handle on duplicate data is now a condition of continued grant access, not a background administrative task.

The Numbers Stacking Up Across Mitchell Street and Beyond

The Bendigo Regional Archives Centre on Pall Mall and the Goldfields Library Corporation — which services branches including the Bendigo Library on Hargreaves Street — have both flagged duplicate image volumes as a priority concern in their 2025–26 internal planning cycles. The Goldfields Library Corporation services a catchment of roughly 120,000 residents across 11 branches, and its digital asset register has grown substantially since a 2021 push to scan fragile local history materials.

Industry benchmarks from digital preservation bodies suggest that duplicate and near-duplicate image files typically represent between 15 and 30 percent of an unmanaged collection's total storage footprint. Applied conservatively to a mid-sized regional archive holding 200,000 image files, that means anywhere from 30,000 to 60,000 files may be consuming space without adding archival value. At commercial cloud storage rates — which hovered around AUD $0.023 per gigabyte per month for standard tiers as of mid-2026 — the redundant storage bill compounds every quarter.

La Trobe University's Bendigo campus, which houses the Bendigo campus library and collaborates with local historical programs through its humanities and social sciences faculty, has also been grappling with collection overlap. When community digitisation volunteers upload batches from private collections — a practice actively encouraged under heritage programs run through the City of Greater Bendigo — duplicate detection software is rarely applied at the point of ingestion. Files arrive in multiple formats, at varying resolutions, and often with inconsistent metadata. The result is a haystack problem: archivists know the duplicates are in there, but finding and removing them manually would take hundreds of hours.

Detection Tools and What They Actually Cost to Run

Automated duplicate image detection — using perceptual hashing algorithms that identify visually similar images even when file sizes or formats differ — is now available through open-source tools and commercial platforms alike. The open-source tool digiKam, used by some volunteer archivists, can process a collection of 50,000 images in under four hours on standard desktop hardware. Commercial solutions pitched at cultural institutions range from roughly AUD $2,000 to $18,000 annually depending on collection size and support level.

Bendigo Health's expanding capital works program on Lucan Street has drawn most of the regional IT policy conversation in recent years, and rightly so — the health service's infrastructure investment is substantial. But smaller institutions operating on tighter margins feel the storage cost squeeze more acutely. A community historical society paying its own hosting bills has far less room to absorb redundant file costs than a major health service with a dedicated IT department.

The City of Greater Bendigo's Heritage Strategy, which runs to 2027, explicitly references digital asset quality as a component of collection health. Institutions that can document their duplicate-reduction work before the September funding round will be better positioned to argue they are managing public money responsibly.

Practically speaking, archivists at smaller Bendigo organisations are being advised by state body peers to run an audit using free perceptual hashing tools before attempting any cull, to preserve originals in cold storage before deleting apparent duplicates, and to establish a consistent file naming protocol for all future ingestion. None of it is glamorous work. But in a region where every digitisation dollar traces back to a grant application, knowing exactly what you have — and how many times you have it — is now foundational to keeping the funding flowing.