Brussels Archives Are Drowning in Duplicate Images — and the Numbers Tell a Damaging Story

Brussels municipal digital archives are carrying an estimated 40 percent rate of duplicate image files across shared institutional servers, according to internal auditing work carried out by the city's urban data department earlier this year. The figure, which emerged from a broader digitisation review finalised in March 2026, points to a systemic storage problem that has quietly inflated IT costs and degraded the reliability of public visual records across dozens of city departments.

The timing matters. Brussels is currently mid-way through its Smart City Brussels 2030 programme, a multi-year initiative backed by the Brussels-Capital Region that commits public bodies to streamlining digital infrastructure and cutting redundant data overhead. Duplicate image files — photos uploaded multiple times, scanned documents stored in parallel folders, heritage images migrated without deduplication — represent one of the most concrete and measurable failures in that ambition. When files pile up unsorted, metadata degrades, retrieval slows, and staff waste hours confirming which version of an image is the authorised one.

The problem is visible at two specific institutions. At the Musée de la Ville de Bruxelles on the Grand-Place, digitisation staff have been working since January 2026 to rationalise a heritage photograph collection that swelled to over 180,000 stored image files, a number that internal project documents suggest contains a duplication rate of roughly one-in-three items. Separately, Urban.Brussels — the regional planning and heritage authority headquartered on Rue du Progrès — flagged in a 2025 annual report that its architectural documentation database had accumulated duplicate entries across at least six distinct upload pipelines, each tied to separate renovation permit workflows.

What the Numbers Actually Show

Duplicate image bloat carries direct financial consequences. Cloud and on-premise storage costs for Brussels-Capital Region public bodies are benchmarked internally against a tiered pricing model. At current rates, retaining redundant files across a mid-sized departmental server adds roughly €4,000 to €9,000 per year in unnecessary storage spend per department, before accounting for staff time spent managing conflicting file versions. Across the 19 communes and dozens of regional agencies that report into shared infrastructure frameworks, the compounded waste is significant.

Deduplication software trials run by the city's Centre d'Informatique pour la Région Bruxelloise (CIRB) during the second half of 2025 identified that automated scanning could resolve around 65 percent of duplicate conflicts without human intervention, flagging the remaining 35 percent for manual review because of ambiguous metadata or intentional archival variants. That trial, conducted across a test dataset of 22,000 image files drawn from public construction permit records lodged at Ixelles and Anderlecht commune offices, cut raw storage volume by 28 percent within six weeks.

The CIRB presented those findings to a working group in February 2026. Implementation across a broader set of institutions has not yet been scheduled.

What Comes Next for City Departments

The practical path forward involves three steps that archivists and IT managers across Belgian public bodies are increasingly treating as standard practice. First, institutions need a baseline audit — an automated scan that produces a full duplicate map before any deletion takes place. Second, any deduplication workflow must assign a canonical master file and retire duplicates to a quarantine folder rather than hard-deleting them, preserving a recovery option for 90 days. Third, upload protocols at the point of entry need to be tightened: the same image arriving through two different permit portals should be flagged in real time, not discovered months later during a storage review.

For residents and neighbourhood organisations in areas like Molenbeek-Saint-Jean and Schaerbeek, where urban renewal project documentation is particularly dense, the practical effect of unresolved duplicates is that public-facing planning portals sometimes surface outdated or misidentified images alongside current ones — a credibility problem as much as a technical one. The Smart City Brussels 2030 programme has set a target of full archival integrity audits across all participating institutions by December 2027. Based on the current pace of implementation, that deadline will require a significant acceleration in both budget allocation and inter-agency coordination before the end of this year.