France’s Health Data Hub (HDH) is finally moving away from Microsoft Azure. The national platform for health data will migrate to Scaleway, a French cloud provider, in a clear signal that Europe’s sovereignty debate is translating into concrete action.

The decision, announced in early 2025, ends years of controversy over hosting sensitive health data on a US-owned cloud. Critics had argued that Azure fell under the US Cloud Act, potentially exposing French medical records to foreign intelligence. The move to Scaleway, which holds both HDS (Health Data Hosting) and SecNumCloud certifications, addresses those concerns head-on.

Why This Matters

The Health Data Hub was launched in 2019 to centralize and anonymize French health data for research. It was initially hosted on Microsoft Azure, a choice that drew fire from privacy advocates and politicians. The French data protection authority, CNIL, had repeatedly flagged risks related to US surveillance laws.

Scaleway, a subsidiary of Iliad (the parent company of Free), offers a fully sovereign cloud stack. Its infrastructure is physically located in France, and it complies with France’s highest security standards. The SecNumCloud certification, issued by ANSSI (the French cybersecurity agency), ensures that data is protected against foreign jurisdiction.

The Migration Timeline

According to sources familiar with the plan, the migration will occur in phases. The first batch of datasets is expected to move by mid-2025, with full completion targeted by the end of 2026. The transition involves not just storage but also compute and analytics workloads.

The HDH currently holds over 20 petabytes of health data, including genomic sequences, hospital records, and insurance claims. Moving that volume without disrupting ongoing research is a monumental task. Scaleway has been preparing for this by expanding its data center capacity and developing specialized health-data services.

Technical Details

Scaleway’s cloud is built on open-source technologies like OpenStack and Ceph. It offers Kubernetes, bare-metal servers, and object storage that are fully compatible with standard APIs. This should ease migration, as the HDH’s existing tools—many of which are cloud-native—can run with minimal modification.

However, some services unique to Azure, such as advanced AI models or specific compliance tools, may require re-engineering. The HDH has not disclosed which Azure services it currently uses, but a source close to the project mentioned that “the majority of workloads are based on open standards.”

Scaleway also provides a service called “Confidential Computing” that encrypts data even during processing. This could be crucial for maintaining privacy guarantees under French law.

Political and Economic Context

This move is part of a broader European push for digital sovereignty. The EU’s Gaia-X initiative, designed to create a federated cloud infrastructure, has struggled to gain traction. France, however, has been particularly aggressive in promoting domestic alternatives.

In 2021, the French government announced a €1.8 billion plan to support cloud providers that meet sovereignty requirements. Companies like OVHcloud and Scaleway have been direct beneficiaries. The HDH contract is a major win for Scaleway, potentially worth tens of millions of euros over several years.

“This is a turning point,” said a French digital ministry official who spoke on condition of anonymity. “We are showing that sensitive data can be hosted in Europe without sacrificing performance.”

What This Means for Other Countries

France’s decision could have a domino effect. Other European nations, including Germany and the Netherlands, are reviewing their cloud strategies. Germany’s health data platform, for instance, is still on Azure but faces similar criticism.

The European Commission has also been pushing for more sovereign cloud options. Its “European Cloud for Open Science” project (EOSC) aims to provide a federated infrastructure for research data.

For Microsoft, the loss of the HDH is a setback but not a disaster. The company still holds major contracts with French government agencies, including the Ministry of the Interior and the tax authority. Still, the symbolic impact is significant: if health data can be moved, other sensitive workloads might follow.

Challenges Ahead

The migration is not without risks. Scaleway must prove it can handle the scale and complexity of the HDH’s operations. The platform supports hundreds of research projects, many of which rely on real-time data access. Any extended downtime could harm scientific work.

Additionally, the HDH will need to retrain its staff on Scaleway’s tools. While both clouds support standard APIs, there are differences in management consoles, billing, and support workflows.

Cost is another factor. Scaleway’s pricing is competitive, but the migration itself will incur expenses. The French government has allocated €50 million for the transition, though some analysts say that figure may rise.

Looking Forward

The Health Data Hub’s move to Scaleway is a landmark event. It proves that sovereign cloud alternatives are viable for large-scale, sensitive workloads. For Scaleway, it’s an opportunity to showcase its capabilities on a global stage.

For Microsoft, it’s a reminder that cloud dominance is not guaranteed. The company will need to adapt its offerings to address sovereignty concerns if it wants to retain European government clients.

As for the HDH, the focus remains on its mission: enabling health research while protecting patient privacy. With Scaleway, it now has a platform that aligns with both goals.

The next few months will be critical. If the migration succeeds, it could accelerate the shift toward sovereign clouds across Europe. If it stumbles, it may reinforce the view that US hyperscalers are the only reliable option.

Either way, the French Health Data Hub has made its choice. The rest of Europe will be watching closely.