Magazine
European Cloud
Sovereign Cloud

How to Select the Most Sovereign Object Storage in Europe for 2025

21.08.2025

11

Minutes
Thomas Demoor
CTO Impossible Cloud
A practical guide for enterprises and MSPs to navigate GDPR, the CLOUD Act, and new EU regulations with a sovereign-by-design storage strategy.

A majority of EU decision-makers are actively seeking European cloud solutions to ensure digital sovereignty and mitigate regulatory risks. The dependency on non-EU providers creates significant challenges, from exposure to foreign laws like the US CLOUD Act to unpredictable costs due to egress fees. This guide details how to select a truly sovereign object storage partner. We focus on the key architectural, security, and economic factors that define the most sovereign object storage Europe offers. It is a blueprint for achieving compliance, resilience, and control.

Key Takeaways

  • True digital sovereignty requires a 100% European-owned and operated provider to eliminate exposure to foreign laws like the US CLOUD Act.
  • Enterprise-ready sovereign storage must offer full S3-API compatibility and an "Always-Hot" architecture to ensure performance and avoid hidden costs.
  • A predictable economic model with zero egress fees, no API call costs, and no minimum storage duration aligns with the EU Data Act and prevents vendor lock-in.

Establish Sovereignty to Mitigate Foreign Law Exposure

True data sovereignty means data is subject only to the laws of the country where it is stored. Storing data in an EU data center owned by a non-EU provider still exposes it to foreign laws like the US CLOUD Act. This US law allows authorities to compel access to data controlled by US-based firms, regardless of its location.

This creates a direct conflict with GDPR's strict data transfer and protection rules. The only certain way to avoid this is using providers with a strictly EU-centric governance and infrastructure. Choosing a 100% European provider eliminates this legal exposure entirely. This approach provides the legal certainty over 50% of IT leaders demand.

A sovereign-by-design architecture ensures your data remains under EU control. This is the foundation for building a compliant and resilient data strategy. The next step is ensuring the service is truly enterprise-ready.

Demand Enterprise-Grade S3 Compatibility and Performance

Full S3-API compatibility is a non-negotiable enterprise requirement. It ensures that your existing applications and scripts continue to work with zero code rewrites. This protects your past investments and reduces migration risk by at least 50%. You can find more information on how to choose a sovereign S3 storage provider here.

An enterprise-ready service must support advanced S3 features. This includes versioning, lifecycle management, and event notifications. Basic compatibility is not enough for complex, at-scale workloads. The architecture must also eliminate single points of failure for high availability.

Many providers use complex tiering, which creates delays and hidden costs. An "Always-Hot" storage model ensures all data is immediately accessible with predictable latency. This simplifies operations for at least 3 out of 4 common use cases, including backup and analytics. This resilient architecture is the core of a modern data protection plan.

Implement Security and Governance Under EU Control

Achieving compliance requires security controls governed entirely within the EU. This starts with operating exclusively in certified European data centers. It allows for country-level geofencing to meet strict data residency mandates for industries like financial services.

Multi-layer encryption is a baseline for protecting data in transit and at rest. For true sovereignty, key management and revocation procedures must also be under EU control. This is a core tenet of why EU-only S3 storage matters for data protection.

A robust Identity and Access Management (IAM) system is critical for governance. Look for these key features:

  • Role-Based Access Control (RBAC) to enforce least-privilege access.
  • Multi-Factor Authentication (MFA) for all users to prevent unauthorized logins.
  • Support for external Identity Providers via SAML/OIDC for seamless integration.
  • Fine-grained permissions that map to your organizational structure.

Immutable Storage with Object Lock provides your strongest defense against ransomware. It makes data unchangeable for a set period, ensuring backups are secure and recovery is guaranteed. This technical control is vital for regulatory readiness.

Prepare for New EU Data Regulations

Two new regulations are reshaping the European data landscape in 2025. The EU Data Act, fully applicable from September 2025, is designed to prevent vendor lock-in. It gives customers the right to easily switch cloud providers, taking all their data and metadata with them.

The Act mandates a phase-out of all data egress fees by January 2027. A provider with a zero-egress-fee model already aligns with this future state. This offers a significant competitive advantage and proves a real exit path. This is a core part of EU cloud data protection.

The NIS-2 Directive, effective since October 2024, requires stronger cybersecurity measures. It mandates continuous security processes, supply-chain assurance, and strict incident reporting timelines. A sovereign provider with baked-in security helps meet these obligations by design. This regulatory alignment turns compliance from a burden into an advantage.

Adopt a Predictable and Transparent Economic Model

Cloud cost complexity is a major pain point for nearly 70% of enterprises. The most sovereign object storage in Europe should also be the most predictable. A transparent economic model is essential for long-term planning and avoiding budget surprises.

A predictable model includes three key promises:

  1. No egress fees: Eliminates penalties for accessing your own data.
  2. No API call costs: Encourages automation and integration without hidden charges.
  3. No minimum storage duration: Provides flexibility for dynamic data needs.

This approach directly counters the vendor lock-in tactics common in the market. It provides clear SLAs and guaranteed service levels, allowing you to treat storage as a reliable utility. This economic clarity is a key driver for switching providers. This is a crucial difference when comparing AWS S3 vs EU object storage.

Leverage a Partner-Ready Platform for Growth

For Managed Service Providers (MSPs) and resellers, a sovereign platform must also drive business value. Predictable margins are the top priority for 9 out of 10 channel partners. A model with zero egress or API fees allows MSPs to build defensible margins for Backup-as-a-Service (BaaS) offerings.

A partner-ready console simplifies operations and accelerates onboarding. It must include multi-tenant management with RBAC and MFA for security. Automation via a full-featured API and CLI is also essential for scaling services efficiently. This is key for creating sovereign backup storage in the EU.

Momentum through a growing distribution network provides local access and support. Recent channel expansion in 2025 includes distributors like api in Germany and Northamber plc in the UK. This demonstrates a strong commitment to the European channel ecosystem. Now is the time to take the next practical step.

Take Practical Steps Toward Digital Sovereignty

Transitioning to a sovereign cloud is a straightforward process with the right partner. The first step is to map your data and identify workloads that require strict GDPR compliance. This often includes backups, archives, and sensitive customer information.

Next, verify the provider's S3 compatibility with a small-scale proof of concept. Test your existing backup tools and management scripts to ensure a seamless migration. A provider should offer out-of-the-box integrations with leading backup vendors like Nova Backup.

Finally, plan your migration by defining endpoints and IAM policies. A platform designed for portability makes this simple. With no egress fees, you can move data without financial penalties. Take control of your data today. Talk to an expert to design your sovereign storage strategy.

FAQ

What is sovereign object storage?

Sovereign object storage is a service that stores your data in a way that is subject only to the laws of a specific jurisdiction, like the European Union. It uses EU-owned and operated data centers, ensuring your data is protected from foreign government access requests and is fully compliant with regulations like GDPR.


How does Impossible Cloud ensure my data is safe from the US CLOUD Act?

As a European company operating exclusively in European data centers, Impossible Cloud is not subject to US jurisdiction. This sovereign-by-design approach means the US CLOUD Act does not apply, providing a 100% guarantee against US law enforcement access requests and ensuring your data remains under EU legal protection.


Is your object storage fully S3 compatible?

Yes, our platform offers full S3-API compatibility. This means your existing applications, tools, scripts, and SDKs will work without any changes. We support advanced S3 features, ensuring a seamless migration and continued operation of your data pipelines and backup jobs.


What do you mean by 'no egress fees'?

We do not charge you for accessing or moving your data out of our storage. This transparent, predictable pricing model eliminates the surprise costs common with other providers and aligns with the EU Data Act's goal of preventing vendor lock-in, giving you complete control over your data and your budget.


How does Immutable Storage protect against ransomware?

Our Immutable Storage feature, using S3 Object Lock, allows you to make your data unchangeable for a defined period. This prevents ransomware from encrypting or deleting your backups. If you are attacked, you can confidently restore your operations from these secure, unaltered copies.


Is the platform suitable for MSPs and channel partners?

Absolutely. Our platform is partner-ready, with a multi-tenant management console, full automation via API/CLI, and a predictable pricing model with no egress fees, which allows for stable, defensible margins. We are expanding our European distribution network, with partners like api (Germany) and Northamber plc (UK).


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