Sovereign Cloud in Europe: How Open Source Is Outpacing Hyperscalers in GDPR Compliance

Sovereign Cloud in Europe: Why Open Source Beats Hyperscalers in GDPR Compliance

There's a question many European IT managers and DPOs are asking themselves in 2026: are corporate data on AWS, Azure, or Google Cloud really safe from a legal and sovereignty perspective?

The answer, analyzing the current legislation, is more complex than American vendors let on.

The problem no American hyperscaler can solve

In 2018, the American Cloud Act came into force — the Clarifying Lawful Overseas Use of Data Act. This law obliges American technology companies to hand over their customers' data to US authorities upon request, regardless of where that data is physically hosted.

In practical terms: if your data is on AWS Frankfurt, Azure Netherlands or Google Cloud Belgium, American authorities can request access to that data without informing you and without requiring international legal assistance.

This is not a theoretical risk. It is a structural and permanent vulnerability of any cloud service managed by a company subject to American jurisdiction — regardless of where the servers are physically located.

The European GDPR, on the other hand, prohibits the transfer of personal data to third countries that do not guarantee an adequate level of protection. The tension between the US Cloud Act and European GDPR is irresolvable as long as data remains under the jurisdiction of an American provider.

What a Sovereign Cloud is and why it is different

A Sovereign Cloud is not simply a cloud with servers in Europe. It is an infrastructure specifically designed to ensure that data is under the full legal and operational sovereignty of the organisation managing it.

Four characteristics define a true Sovereign Cloud.

Exclusive European jurisdiction. Data is hosted in data centres located in the EU, managed by companies subject exclusively to European jurisdiction. No non-European entity can access the data without a European legal procedure.

Open-source software without non-European dependencies. The infrastructure is based on open-source technologies — OpenStack, Kubernetes, Ceph — without dependencies on proprietary American software that could include backdoors or disclosure obligations to foreign authorities.

Encryption with keys under the customer's control. With BYOK (Bring Your Own Key) and HSM (Hardware Security Module), encryption keys are managed exclusively by the customer organisation. Even the cloud provider cannot access the encrypted data.

Guaranteed reversibility. Data and configurations are exportable at any time in open standard formats. No vendor lock-in preventing a change of provider.

The comparison: open-source Sovereign Cloud vs American hyperscalers

Let us analyse the critical points for European companies choosing where to host their data.

Cloud Act USA compliance

AWS, Azure, Google Cloud: subject to the Cloud Act — US authorities can request access to data at any time.

Epic Edge open-source Sovereign Cloud: not subject to the Cloud Act — the company is Italian, data is in the EU, no dependencies on American entities.

GDPR compliance

AWS, Azure, Google Cloud: declared GDPR compliance but structurally in tension with the Cloud Act. Standard contractual clauses do not eliminate the Cloud Act risk.

Epic Edge open-source Sovereign Cloud: native GDPR compliance — data in the EU, no transfer to third countries, continuous auditing, ISO 27001 certification.

Control of encryption keys

AWS, Azure, Google Cloud: offer BYOK but keys are still managed through their systems — in the event of an American government request, the provider is obliged to cooperate.

Epic Edge open-source Sovereign Cloud: BYOK with physical or virtual HSMs under the exclusive control of the customer — Epic Edge has no access to encryption keys.

Vendor lock-in

AWS, Azure, Google Cloud: proprietary formats, proprietary APIs, egress costs for data extraction. Changing provider requires costly migration projects.

Epic Edge open-source Sovereign Cloud: OpenStack and Kubernetes open-source, standard formats, no egress costs, contractually guaranteed reversibility.

Long-term costs

AWS, Azure, Google Cloud: apparently convenient pay-per-use model but with costs that grow non-linearly with data volume and operations. Data egress costs are one of the most critical items.

Epic Edge open-source Sovereign Cloud: predictable and stable costs, no egress costs, no unilateral price increases.

Who needs a Sovereign Cloud most

Not all organisations have the same urgency. These are those for whom Sovereign Cloud is not an option but a necessity.

Financial sector. Banks, insurance companies and asset management firms are subject to EBA (European Banking Authority) and ECB regulations requiring direct control over data and systems. Dependence on American providers exposes them to significant regulatory risks.

Healthcare. Healthcare data is among the most protected categories under GDPR. Hosting it on American hyperscalers exposes organisations to both compliance and reputational risks in the event of a breach or request from foreign authorities.

Public administration. Most European public administrations are already moving towards Sovereign Cloud solutions due to national regulatory obligations. In Italy, the ACN (National Cybersecurity Agency) framework requires qualified cloud for sensitive public administration data.

Defence and security. Obviously incompatible with American solutions for any classified or sensitive data.

Companies with critical IP. Any organisation with strategic intellectual property — formulae, algorithms, patents, sensitive commercial data — should carefully assess the risk of hosting it on infrastructure subject to the Cloud Act.

NIS2 and Sovereign Cloud: the new European obligation

The NIS2 Directive, which came into force in October 2024, significantly extends cybersecurity obligations for European organisations in critical sectors — energy, transport, healthcare, digital infrastructure, public administration, space.

NIS2 requires technical and organisational measures for cyber risk management, notification of incidents within 24 hours for serious incidents and 72 hours for significant incidents, and direct management responsibility for security measures adopted.

An open-source Sovereign Cloud with 24/7 SIEM/SOC, complete audit trail and certified incident response procedures is the most effective response to NIS2 requirements for organisations in critical sectors.

Epic Edge Sovereign Cloud: how it is built

Epic Edge designs and implements Sovereign Cloud infrastructures based on OpenStack for compute and networking, Ceph for distributed storage, Kubernetes for containerised workloads — on the customer's hardware or in agreed European data centres.

All infrastructures are deployed in the customer's environments or in data centres located in Italy and the EU. ISO 27001 certification covers all information security management processes. The service includes periodic GDPR and NIS2 compliance audits with complete documentation for DPOs and compliance managers.

Migrating from hyperscalers to Sovereign Cloud: is it complex?

It depends on the current architecture. For standard workloads — web applications, databases, storage — migration from AWS or Azure to an OpenStack Sovereign Cloud is technically similar to any other cloud migration.

The main steps are assessment of the current environment with mapping of all cloud services used, identification of dependencies on hyperscaler proprietary services, design of the target architecture on OpenStack and Kubernetes, progressive migration of workloads with systematic testing, and cut-over with minimal downtime.

Complexity increases for workloads using proprietary hyperscaler services — Lambda, DynamoDB, BigQuery — which have no direct equivalents in OpenStack. In these cases Epic Edge evaluates the most efficient re-platforming path on a case-by-case basis.

Conclusion: digital sovereignty is not a luxury, it is a necessity

2026 marks a point of no return for European digital sovereignty. Geopolitical tensions, the US Cloud Act, GDPR, NIS2 and European initiatives such as Gaia-X are pushing organisations in every sector to reconsider where and how they host their critical data.

Open-source Sovereign Cloud is not a second-rate alternative to American hyperscalers. It is a strategic choice that guarantees legal independence, operational control, regulatory compliance and long-term economic sustainability.

For European organisations in regulated sectors this is no longer a question of technological preference. It is a question of compliance, management responsibility and protection of business interests.

Want to assess the migration to Sovereign Cloud for your organisation?

Epic Edge offers an assessment of your current infrastructure and a migration plan towards open-source Sovereign Cloud compliant with GDPR and NIS2.