Magazine
European Cloud
GDPR Compliance

What Is the Most Compliant Cloud Storage in Europe for 2025?

07.08.2025

10

Minutes
Christian Kaul
Founder & COO Impossible Cloud
A guide to navigating GDPR, the EU Data Act, and NIS-2 with a sovereign-by-design storage architecture that eliminates regulatory risk and unpredictable costs.

A strong majority of EU decision-makers now demand European solutions for their critical data infrastructure. The challenge is finding the most compliant cloud storage in Europe that delivers on GDPR without sacrificing enterprise-grade performance or introducing high costs. True digital sovereignty is built on three pillars: EU-only data residency to avoid CLOUD Act exposure, a predictable cost model with zero egress fees, and robust, modern security. This article outlines a blueprint for selecting a storage solution that meets today's regulatory demands and is ready for tomorrow's challenges, including the EU Data Act and NIS-2 directive.

Key Takeaways

  • True GDPR compliance requires a sovereign-by-design approach, using EU-only data centers and European ownership to eliminate risks from foreign laws like the CLOUD Act.
  • Upcoming regulations like the EU Data Act (September 2025) and NIS-2 make data portability, transparent costs, and continuous security processes mandatory.
  • A predictable cloud cost model with zero egress fees and zero API call costs aligns with the EU Data Act's goals and de-risks operations for enterprises and MSPs.

Establish Digital Sovereignty to Mitigate Foreign Law Exposure

Storing data within EU borders is the first step toward compliance, but the provider's origin is equally important. U.S. laws like the CLOUD Act grant authorities access to data held by U.S.-controlled companies, regardless of where the data is physically stored. This creates a direct conflict with GDPR's mandate that court orders from third countries are only valid if based on an international agreement. A provider that is 100% European-owned and operated eliminates this legal jeopardy entirely.

The demand for EU data residency is a primary selection criterion for over 50% of IT leaders today. This is driven by the need for absolute legal certainty over sensitive corporate and customer information. By choosing a sovereign-by-design platform, businesses ensure their data remains exclusively under EU jurisdiction. This strategy is fundamental to building EU-only data protection and customer trust. This focus on jurisdictional integrity prepares businesses for the next wave of regulations.

Prepare for Upcoming EU Data Regulations by Design

Two major regulations are reshaping the compliance landscape for 2025 and beyond. The EU Data Act, applicable from September 2025, mandates data portability and interoperability to prevent vendor lock-in. It requires cloud providers to offer transparent terms and standardized processes, making it simple to switch providers without technical or financial penalties. A storage solution with full S3-API compatibility and no egress fees inherently aligns with these principles.

Simultaneously, the NIS-2 Directive expands cybersecurity obligations to 18 critical sectors. It requires continuous security processes, supply-chain assurance, and robust incident reporting, with fines reaching up to 2% of annual turnover for non-compliance. A compliant cloud partner helps meet these demands through:

  • Verified Encryption: Multi-layer encryption for data in transit and at rest, with EU-controlled key management.
  • Continuous Security: Documented processes for vulnerability management and incident reporting timelines.
  • Supply-Chain Assurance: Operations based exclusively in certified European data centers.

Choosing a platform built to these standards simplifies achieving total regulatory compliance. This architectural soundness is the foundation of true resilience.

Implement an Architecture Built for Resilience and Availability

Compliance extends beyond legal frameworks to the technical architecture that protects data integrity and availability. An architecture that eliminates single points of failure is essential for meeting business continuity requirements under regulations like NIS-2. This includes strong read/write consistency and multi-AZ replication for data integrity under any workload. Many legacy systems rely on complex, fragile tiering models that introduce delays and hidden costs during data restores.

An "Always-Hot" object storage model ensures all data is immediately accessible, with zero restore delays. This approach simplifies operations and strengthens recovery capabilities, a key component of ransomware defense. It also guarantees that third-party tools, like backup software from partners such as Veeam or NovaBackup, function predictably. This modern architecture provides the performance needed for today's data challenges.

Leverage Advanced Security Features for Proactive Ransomware Defense

Regulatory compliance demands a proactive defense against modern threats like ransomware. Immutable Storage with S3 Object Lock is a critical defense layer, making backups unchangeable for a defined period. This feature provides an audit-ready retention policy that satisfies GDPR's integrity and confidentiality principles. It ensures that even if primary systems are compromised, a clean, uncorrupted copy of the data is available for recovery in minutes.

Robust access controls are another pillar of a compliant security posture. An effective Identity and Access Management (IAM) system should include these four elements:

  1. Granular, role-driven policies (RBAC).
  2. Mandatory multi-factor authentication (MFA).
  3. Support for external identity providers via SAML/OIDC.
  4. Time-bounded access controls and presigned URLs.

These features, managed through a first-class console UX, provide the tools needed to enforce secure defaults and protect European cloud data effectively. Such technical safeguards must be paired with a transparent economic model.

Adopt a Predictable Economic Model to De-Risk Operations

Cost complexity and vendor lock-in are significant business risks that the EU Data Act aims to solve. Many cloud providers impose egress fees, API call costs, and minimum storage durations, making budgets unpredictable. A transparent pricing model with zero egress or API fees is a competitive advantage. It allows businesses to access and move their data freely, aligning perfectly with the EU's goal of data portability.

For Managed Service Providers (MSPs) and resellers, this predictability is essential for building profitable services. It creates stable, defensible margins for Backup-as-a-Service (BaaS) and archiving solutions. With guaranteed service levels and regional proximity for low latency, businesses can build reliable plans. This economic clarity is a key part of what makes a provider a true partner, as reflected in recent distribution momentum with channel partners like api (Germany) and Northamber plc (UK). This partner-centric approach is key to simplifying compliance management.

Streamline Compliance Management for Partners and Enterprises

The best compliant cloud storage in Europe must be practical for both enterprises and the MSPs that serve them. A partner-ready platform simplifies compliance management at scale with a multi-tenant console. This allows MSPs to manage multiple clients securely with features like role-based access control (RBAC) and MFA. Automation via a full-featured API and CLI enables fast onboarding and integration into existing workflows.

For enterprise IT leaders, a powerful console UX is just as important. It allows teams to manage buckets, assign roles, and configure lifecycle rules without deep API expertise. This focus on usability ensures that advanced compliance features are accessible and correctly implemented. Whether migrating from tape-to-cloud or establishing a disaster recovery plan, the right platform makes GDPR-compliant storage an operational asset, not a burden. To get started, a conversation with an expert can clarify your specific needs.

FAQ

What is sovereign cloud storage?

Sovereign cloud storage is a service where data is stored and managed in a specific country or region, subject only to the laws of that jurisdiction. For Europe, this means the provider is European-owned and operates exclusively in EU data centers, ensuring data is protected by GDPR and insulated from foreign laws.


How does 'Always-Hot' storage improve compliance and resilience?

An 'Always-Hot' storage model ensures all data is instantly accessible without any delays from tiering or archives. This simplifies operations, guarantees predictable performance for restores, and strengthens disaster recovery plans, which are key components of regulations like NIS-2.


What does S3 compatibility mean for my business?

Full S3 compatibility means your existing applications, scripts, and backup tools that use the S3 API can connect to the storage service without any code changes. This protects your past investments, minimizes migration risk, and ensures seamless integration with a broad ecosystem of software.


Are there any hidden costs I should be aware of?

Impossible Cloud offers a transparent and predictable pricing model with no hidden costs. There are no egress fees for retrieving your data, no charges for API calls, and no minimum storage durations, which helps you avoid the unpredictable billing common with other providers.


How does Immutable Storage protect against ransomware?

Immutable Storage, using S3 Object Lock, allows you to set a retention policy that makes your data unchangeable for a specified time. Even if attackers gain access, they cannot encrypt, modify, or delete the protected backup files, ensuring you can always restore a clean version of your data.


Is it difficult to migrate to Impossible Cloud?

Migration is straightforward due to full S3-API compatibility. You can use your existing S3-compatible tools and scripts by simply changing the endpoint and credentials. This minimizes disruption and allows for a smooth transition for backup, archiving, and other workloads.


Would you like more information?

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