Sovereign Cloud Solutions: Secure European Data Control

18.06.2025

TL;DR

European sovereign cloud initiatives – such as Gaia-X and the EU Cloud Rulebook – are defining new standards for data sovereignty.
More than 60 percent of European corporate data resides with U.S. hyperscalers – a strategic risk following the Schrems II ruling.
German providers including T-Systems, SAP, and IONOS are positioning themselves as sovereign alternatives, operating under local legal frameworks.
Sovereign cloud does not mean isolation – it means interoperability with global platforms, under controlled, transparent conditions.
For C-level decision-makers, the question is no longer whether to adopt a sovereign cloud component, but how quickly to integrate it into a broader multi-cloud strategy.

When the next geopolitical crisis hits – and it will – the location of corporate data and ownership of infrastructure will determine far more than regulatory compliance. It will determine operational resilience.

Europe’s response to this reality is the sovereign cloud: an infrastructure governed by European law, operated by European providers, and yet fully interoperable with global platforms. The path to that goal is far rockier than political Sunday speeches suggest – but the alternative is strategic dependency.

The Problem: Digital Dependency as a Business Risk

The figures are sobering. More than 60 percent of all European corporate data resides with AWS, Microsoft Azure, or Google Cloud. Three U.S. companies control the digital infrastructure of an entire continent. What happens if the political framework shifts?

The Court of Justice of the European Union’s (CJEU) Schrems II ruling demonstrated that transatlantic data agreements rest on shaky ground. The EU-U.S. Data Privacy Framework could be invalidated at any time. And the U.S. CLOUD Act grants American authorities access to data stored on U.S. servers – regardless of its physical location.

For European companies, this means: Every strategic decision predicated on the assumption of stable U.S. cloud availability carries a geopolitical risk that never appears on any balance sheet.

Gaia-X, the EU Cloud Rulebook, and Reality

Launched in 2019 as a European flagship initiative for cloud sovereignty, Gaia-X has delivered mixed results six years on. Its architecture is in place, its standards defined – but practical implementation lags behind ambition.

More immediately relevant to corporate operations is the EU Cloud Rulebook, which sets concrete requirements for data localisation, portability, and interoperability. Combined with the Data Act – due to enter into force in September 2025 – this forms a regulatory framework that directly shapes cloud decisions.

The message for CIOs: sovereign cloud is no longer an abstract concept – it’s becoming operational reality through regulation. Any cloud strategy designed today without a sovereign component is designed in disregard of current and upcoming regulation.

German Providers on the Rise

The gap between political ambition and technical reality is narrowing – albeit slowly. T-Systems offers the Open Telekom Cloud, a sovereign cloud solution operating entirely under German law. SAP has launched its Sovereign Cloud Edition, a variant tailored for highly regulated industries. And IONOS is making massive investments in GPU clusters for AI workloads running on European infrastructure.

The advantage of these providers lies not in technology – hyperscalers remain technically superior. Rather, it lies in the legal framework. German providers are not subject to the U.S. CLOUD Act, can contractually guarantee data localization, and offer German-language support from teams that have undergone security vetting.

For sectors such as financial services, healthcare, public administration, and critical infrastructure, this combination is becoming a decisive differentiator.

Multi-Cloud with a Sovereign Component: The Pragmatic Path

The honest answer to the sovereignty question isn’t “either/or” – it’s “both/and.” No European enterprise will abandon AWS or Azure in the short term: dependencies run too deep, migration costs are too high, and the hyperscalers’ functional breadth is simply too extensive.

The pragmatic approach is a tiered multi-cloud strategy: sensitive data and regulated workloads run on sovereign infrastructure, while standardized applications and global services remain with the hyperscalers. The real challenge lies in architecting the interfaces between them.

Three steps to get started: First, conduct data classification – which data sets carry sovereignty implications? Second, identify workloads that can be migrated with minimal refactoring effort. Third, launch a proof of concept with a European provider before regulation intensifies the timeline pressure.

Frequently Asked Questions

What exactly is a sovereign cloud?

A cloud infrastructure operating entirely under the jurisdiction of a single country or legal framework – including data storage, operations, personnel, and access controls. For European companies, this means no access by non-European authorities without a valid European legal basis.

Is sovereign cloud more expensive than AWS or Azure?

Typically yes – usually 15 to 30 percent higher for comparable compute resources. However, this price differential narrows when factoring in compliance costs, risk premiums, and potential regulatory fines. For regulated industries, the question isn’t cost – it’s whether a compliant solution is available at all.

Can hyperscalers themselves offer sovereign regions?

Yes – and they already do: Microsoft with Azure Confidential Cloud, Google with Sovereign Controls, and AWS with its European Sovereign Cloud. Yet the US CLOUD Act remains a concern: as long as the provider is a US-based company, US authorities may potentially demand access. European enterprises must assess this residual risk.

What happens to existing cloud contracts?

Existing contracts remain valid. We recommend negotiating exit clauses and data portability provisions at the next renewal. The EU Data Act grants businesses additional rights for cloud migrations starting September 2025 – including reduced switching fees.

How do I launch a sovereign cloud strategy?

Start with data classification: Which datasets are subject to regulatory requirements? Prioritise those. Then run a proof of concept with a European provider for a specific use case. In parallel, design your multi-cloud architecture so workload portability is built-in – not an after-the-fact retrofit.

Image source: Unsplash / Christian Lue