Berlin's Duplicate Image Problem: The Numbers That Are Costing the City Millions

Berlin's public administration is sitting on a digital hoarding problem. Across the city's distributed network of 12 district offices, three major cultural institutions, and dozens of municipal agencies, IT auditors have identified a systemic pattern of duplicate image files consuming server capacity, inflating storage costs, and slowing down citizen-facing digital services. The problem is not unique to government, but in Berlin — where the SPD-led coalition has staked political credibility on digital modernisation — the scale of redundancy has become a liability.

The timing matters for a specific reason. The Berlin Senate's Digital Strategy 2030, adopted in late 2024, committed the city to consolidating its fragmented data infrastructure under a unified cloud framework by the end of 2026. That deadline is six months away, and auditors working through the Senatsverwaltung für Inneres und Digitales have flagged that duplicate image management — what the industry calls DIM, or duplicate image replacement — is one of the largest unresolved blockers. Without resolving it, the migration cannot proceed cleanly.

What the Data Actually Shows

The numbers are stark. Internal assessments shared with members of the Abgeordnetenhaus's digital committee earlier this year estimated that redundant image files account for between 18 and 23 percent of total unstructured data stored across Berlin's municipal servers. Across roughly 4.8 petabytes of total storage capacity managed by the city's IT service provider ITDZ Berlin — the Informations- und Kommunikationstechnik-Zentrum Berlin — that translates to close to one petabyte of duplicated visual content. Storage at enterprise scale in European public-sector contracts typically runs between €20 and €35 per terabyte per month. Even at the low end, that is a recurring cost that adds up fast.

The problem concentrates in particular departments. The Stadtbibliothek system, which manages digitised collections across 69 branch libraries including the Amerika-Gedenkbibliothek on Blücherplatz in Kreuzberg, has long struggled with inconsistent file naming conventions inherited from pre-2010 cataloguing software. Images of the same archival document can exist under four or five different filenames across different servers. The Berliner Morgenpost reported earlier this year that the city's cultural digitisation projects, including work at the Zentral- und Landesbibliothek Berlin on Breite Straße in Mitte, have produced overlapping asset databases that no single agency currently has authority to reconcile.

Private-sector comparisons give a sense of the fix's complexity. A 2025 benchmarking study by the Bitkom industry association found that medium-to-large German enterprises that had completed structured duplicate-image-replacement programs reduced their unstructured storage footprints by an average of 31 percent within 18 months of rollout. For a city-scale operation, equivalent programs in Hamburg and Munich required between 14 and 20 months of active deduplication work before meaningful cost reductions appeared on balance sheets. Berlin's infrastructure is older and more fragmented than either of those cities' systems.

What Comes Next — and What It Will Cost

ITDZ Berlin has been piloting an automated deduplication tool across two district administrations — Pankow and Tempelhof-Schöneberg — since March 2026. The pilot covers approximately 12 terabytes of image data and is expected to produce a full report by September. If the results support a citywide rollout, procurement for a broader contract would likely begin in late 2026, with implementation stretching into 2027.

For Berliners, the practical stakes are visible in slower-than-expected improvements to the city's online services portal, Berlin.de, where document retrieval and image-heavy pages have lagged behind comparable municipal portals in Frankfurt and Düsseldorf. Web performance audits published by the Open Knowledge Foundation Deutschland in early 2026 ranked Berlin.de below the median for German state capitals on page-load efficiency — a metric directly affected by poorly managed image assets.

The Senate has not yet announced a budget line for a full DIM rollout. What is clear is that doing nothing is itself expensive. Every month of delay on deduplication extends the window in which the Digital Strategy 2030 timeline slips — and in which Berlin keeps paying to store the same image, over and over again, under a dozen different names.