What is sovereign cloud, really? The 4 levels of EU cloud sovereignty and what each one guarantees

Sovereign cloud has no single EU legal definition and is presented as a four-level model distinguishing data location, operational control, local operation, and ownership: EU data residency only guarantees where stored data sits; sovereign controls from US hyperscalers add EU-based operations and key controls but retain US-parent jurisdiction; EU-operated clouds using hyperscaler technology provide local operators but depend on foreign software supply chains; and fully EU-owned, EU-operated providers remove ownership-based exposure to laws such as the US CLOUD Act, often at the cost of fewer services, regions, and GPU resources. The discussion emphasizes that sovereignty involves legal jurisdiction, operational access, technical control, and tested portability rather than merely selecting an EU region, while certifications vary in scope, with France’s SecNumCloud examining ownership and non-EU legal exposure, Germany’s BSI C5 focusing on security controls, and the proposed EUCS scheme remaining unresolved. It recommends selecting sovereignty levels by workload sensitivity, contractual and regulatory obligations, and business needs rather than applying the strictest level universally, while reducing vendor lock-in through containers, Kubernetes, open data-service protocols, Terraform or OpenTofu, and rehearsed migration plans.

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