Moving from US to EU Cloud Providers: Why It Matters for European Businesses Now and What to Consider Before Migrating

The GDPR governs the processing of personal data and places additional requirements on transfers outside the European Economic Area. Data may be transferred to eligible US companies under the EU–US Data Privacy Framework or through safeguards such as Standard Contractual Clauses.

Using a US cloud provider can therefore be lawful, but an EU data-center location alone does not guarantee sovereignty. Businesses must also consider provider ownership, administrative access, subprocessors, and encryption-key control.

The EU Data Act has applied since September 12, 2025. It aims to make switching between cloud providers easier by reducing contractual and technical barriers, improving data portability, and supporting the use of several providers in parallel.

The Act strengthens customers’ exit rights, but it does not make provider-specific applications automatically portable. Businesses still need to identify proprietary dependencies and prepare a technical migration plan.

The Digital Operational Resilience Act (DORA) has applied since January 17, 2025 and primarily affects financial organizations. It requires them to manage risks connected with cloud and other ICT (Information and Communication Technology) providers, particularly where those providers support critical business functions.

Banks, insurers, payment providers, and other covered organizations must assess supplier concentration, contractual arrangements, continuity measures, and exit strategies. DORA does not ban hyperscalers, but it makes unmanaged dependence on one provider harder to justify.

The NIS2 Directive strengthens cybersecurity requirements across 18 critical sectors, including energy, healthcare, transport, digital infrastructure, public administration, and manufacturing. It covers risk management, incident response, business continuity, and supply-chain security.

For European businesses, this means cloud-provider assessments should go beyond certifications and uptime guarantees. Security practices, subcontractors, recovery capabilities, and third-party dependencies also need to be examined.

The Cloud and AI Development Act, or CADA, was proposed by the European Commission in June 2026 and is not yet an applicable regulation. It is intended to expand European cloud and AI infrastructure while strengthening the EU’s technological sovereignty.

The proposal signals that ownership, jurisdiction, operational control, supply chains, and technology dependencies will play a larger role in future cloud assessments and public procurement.

The US CLOUD Act clarifies that providers subject to US jurisdiction may be required to produce data within their possession, custody, or control in response to valid US legal process, even when that data is stored abroad.

It does not give US authorities unrestricted access to European cloud environments. A lawful request is still required. The relevant point is that storing information in an EU data center does not necessarily remove the provider from US jurisdiction.

European companies should therefore evaluate the provider’s corporate structure, contractual entity, administrative access, encryption model, and ability to respond to foreign legal orders.

This approach preserves the public-cloud operating model while changing the provider. It is suitable for organizations that need on-demand infrastructure, managed services, and scalability but want stronger European legal, contractual, or operational control.

The main challenge is replacing services that do not have direct equivalents on the new platform.

Sovereign-cloud environments introduce stricter requirements concerning provider control, administration, personnel, encryption, jurisdiction, supply chains, and technical independence. They may be appropriate for government, defense, critical infrastructure, healthcare, financial services, or strategically sensitive corporate systems.

The word “sovereign” is not sufficiently precise on its own. Buyers must understand exactly which sovereignty level the service provides and where dependencies remain.

A private cloud can run in a company’s own data center, a colocation facility, or a managed provider environment.

Technologies such as Kubernetes and OpenStack can deliver automated resource provisioning and cloud-like operations while providing greater infrastructure control. The company must nevertheless account for platform maintenance, upgrades, capacity, security, resilience, and specialized engineering skills.

Traditional infrastructure can be appropriate for stable workloads with predictable demand, high data volumes, specialized hardware, low-latency requirements, or strict physical-control needs. It is less suitable where demand changes rapidly or where the organization lacks the people and processes required to operate resilient infrastructure.

Multi-cloud architectures use services from more than one public provider. They can reduce reliance on a single supplier, but they do not automatically make applications portable. Two isolated provider-specific environments may create twice the operational complexity without providing realistic failover.

Hybrid cloud combines public cloud, European cloud, private infrastructure, edge systems, or on-premises environments. For many enterprises, it offers the most practical balance between sovereignty and business continuity.

Start by identifying the main reason for the move. The objective may be stronger data control, lower legal exposure, reduced vendor dependence, more predictable costs, or better alignment with customer and regulatory expectations.

Clear goals make it easier to judge whether a full migration is necessary or whether a hybrid model would be more practical.

Create an overview of the applications, databases, storage, integrations, users, and business processes running on the current platform.

This review should show which systems are critical, which contain sensitive data, and which depend heavily on services specific to AWS, Azure, or Google Cloud. These dependencies often determine the cost and difficulty of the migration.

Not every system should move at the same time. Group workloads according to business importance, data sensitivity, technical complexity, and acceptable downtime.

Low-risk applications can be used as early migration candidates. Critical systems should be moved only after the target environment and migration process have been tested.

Compare EU providers based on service coverage, data-center locations, security, support, pricing, reliability, and exit conditions.

At this stage, decide whether the company will move everything to one EU provider or use a broader model that combines EU cloud, private infrastructure, local hosting, and selected hyperscaler services.

Before transferring applications, establish the new cloud environment, including access controls, networking, security policies, monitoring, backups, and recovery procedures.

The target platform should be ready to support real business operations before the first production workload is moved.

Move one representative but non-critical workload first. The pilot should test application compatibility, performance, data transfer, security, support quality, and the effort required from internal teams.

The results can reveal hidden dependencies and help improve the plan before larger systems are affected.

Move applications in several waves rather than through one large cutover. Systems that depend on each other should usually be migrated together.

For each phase, define responsibilities, testing steps, communication procedures, downtime limits, and a rollback option. This reduces the risk of prolonged disruption.

After each migration wave, confirm that applications work correctly, data is complete, performance is acceptable, and security controls operate as expected.

Costs and resource use should also be reviewed. A direct copy of the old setup may carry over inefficiencies that the migration was supposed to remove.

The old cloud resources should be closed only after the new environment has operated reliably and all required data has been verified.

Remove obsolete accounts, revoke access, cancel unused services, review remaining contracts, and confirm that sensitive data and backups are handled according to company policy.

The migration should leave the company in a stronger position than before. Applications, data, documentation, deployment processes, and backups should be organized so that another provider change remains possible.

This does not require every system to be completely provider-neutral. It does require the company to understand its dependencies and maintain a realistic exit path.

The most difficult migrations often involve managed databases, serverless functions, analytics systems, provider-specific identity services, event platforms, or AI tools. Rewriting these components may take more time than transferring the application itself.

An EU data center does not answer every question concerning control, ownership, support access, subcontractors, supply chains, encryption, and portability. Likewise, an EU-headquartered provider may still rely on technologies or operational dependencies that matter to a highly sensitive workload.

Kubernetes improves workload portability, but only for components running inside the Kubernetes layer. Data, networking, identity, secrets, load balancers, storage, observability, and external managed services may still require substantial migration work. Provider-specific Kubernetes extensions can also recreate lock-in.

Migration costs may include:

• Application refactoring
• Parallel environments
• Data transfer
• New licenses
• Testing
• External specialists
• Training
• New monitoring and security tools
• Contract termination
• Temporary productivity loss

A migration budget should include contingency for undocumented dependencies.

Moving to a smaller provider, private cloud, or local infrastructure may transfer more responsibility to the internal team. The organization may need new capabilities in Kubernetes, networking, infrastructure as code, security, databases, observability, and incident response.

Moving every application to one smaller European provider can create a new concentration risk. The company should assess regional redundancy, provider stability, technical openness, export options, partner capacity, and the ability to move again.