Cloud Storage

S3 Compatible

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DevOps engineer monitoring S3-compatible cloud storage servers in a European data center.

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DevOps engineer monitoring S3-compatible cloud storage servers in a European data center.

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DevOps engineer monitoring S3-compatible cloud storage servers in a European data center.

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Achieve Digital Sovereignty with Enterprise-Ready S3 API Compatibility for Developers

29.08.2025

9

Minutes

Christian Kaul

Founder & COO Impossible Cloud

29.08.2025

29.08.2025

9

Minutes

Christian Kaul

Founder & COO Impossible Cloud

Developers need S3 API compatibility, but enterprises demand digital sovereignty and predictable costs. True enterprise-ready object storage delivers both without compromise, eliminating vendor lock-in and ensuring full EU legal certainty.

Key Takeawys

True digital sovereignty requires object storage from a 100% EU-owned and operated provider to ensure GDPR compliance and avoid CLOUD Act exposure.

Enterprise-ready S3 API compatibility must include advanced features like Object Lock, versioning, and lifecycle management to protect investments and ensure seamless migration for developers.

A predictable cost model with zero egress fees, no API call costs, and no minimum storage duration is essential for building scalable and profitable services.

A majority of EU decision-makers now demand European solutions for critical data infrastructure. For developers and IT leaders, the challenge is finding object storage that combines full S3 API compatibility with the strict data residency and sovereignty required under GDPR. This isn't just about ticking a compliance box; it's about eliminating the risk of vendor lock-in, avoiding unpredictable egress fees, and building a resilient data strategy. An enterprise-ready EU alternative must offer performance parity, transparent costs, and seamless integration to protect past investments while future-proofing your architecture.

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Meet the Demand for Sovereign, S3-Compatible Storage

Over 70% of EU businesses prioritize European solutions for their critical infrastructure. This demand is driven by the need for GDPR compliance and avoidance of CLOUD Act exposure. For developers, this means the object storage S3 API compatibility they rely on must be paired with EU-only data centers. True sovereignty is achieved when your provider is governed entirely by EU law. Impossible Cloud meets this need with country-level geofencing to guarantee data residency. This shift is now practical as performance parity with US-based providers becomes a reality. A European focus ensures your data remains under your control, always.

Go Beyond Basic S3 Compatibility for Seamless Integration

True S3 API compatibility is more than just basic object operations. Developers require support for advanced capabilities across the full API, CLI, and SDK toolsets. This includes features essential for modern applications, which are listed below.

  • Versioning for object history and recovery.

  • Lifecycle management to automate data policies.

  • Event notifications to trigger downstream workflows.

  • Immutable Storage with Object Lock for data integrity.

  • Granular IAM policies for precise access control.

This comprehensive support protects your existing technology investments. It allows you to migrate applications and pipelines with zero code rewrites, as detailed in our S3 compatibility guide. This approach minimizes migration risk and keeps your development teams productive with a 100% compatible solution. It is the foundation for a truly portable data strategy.

Build on an Architecture Designed for Predictable Performance

Enterprise applications demand consistent performance, which fragile tiering models often fail to provide. An "Always-Hot" object storage architecture ensures all data is immediately accessible with predictable latencies. This eliminates the restore delays and API timeouts common with tiered storage, reducing operational complexity by 100%. This model guarantees read/write consistency for mixed workloads. Whether you are managing millions of small files or large archives, the performance remains stable. This architectural choice is critical for tools that require instant access, like those from our technology partners. It ensures your backup and recovery operations succeed without fail.

Implement Security and Governance Under Full EU Control

Security must be sovereign by design, starting with EU-controlled key management and multi-layer encryption. Our platform operates exclusively in certified European data centers, aligning with GDPR from the ground up. For ransomware defense, Immutable Storage via Object Lock provides audit-ready data retention for 100% of protected objects. Identity and access management maps to real organizational needs with these key features.

  1. Identity-based IAM with granular, role-driven policies.

  2. Support for external IdPs via SAML/OIDC for unified access.

  3. Time-bounded access controls and presigned URLs.

  4. A first-class console UX for managing permissions without deep API expertise.

This framework supports a zero-trust security model, as seen in our compliant storage solutions. It ensures that governance is never an afterthought.

Leverage Regulatory Readiness as a Competitive Advantage

For developers and businesses, upcoming EU regulations create new opportunities. The EU Data Act, effective from September 2025, mandates data portability and interoperability by design. Our platform provides a real exit path with no lock-in, allowing you to export metadata, versions, and access information. This aligns perfectly with the law's goal to dismantle vendor lock-in. Similarly, the NIS-2 directive requires continuous security processes and supply-chain assurance. Our operations have baked-in vulnerability management and incident reporting, turning compliance into a strategic asset for our integrated solutions. This readiness ensures your business stays ahead of regulatory curves.

Achieve Predictable Economics and Defensible Margins for MSPs

For MSPs and channel partners, unpredictable costs kill margins. Our model is predictable by design, with zero egress fees, no API call costs, and no minimum storage durations. This transparency allows partners to build BaaS and archiving services with stable, defensible margins of over 30%. The multi-tenant partner console simplifies management and onboarding. With full support for automation via API/CLI and robust reporting, partners can scale efficiently. Our distribution momentum with partners like api (Germany) and Northamber plc (UK) expands local access for hundreds of resellers. This partner-ready approach ensures you can deliver value without financial surprises.

Follow a Practical Path to a Sovereign Cloud Strategy

Content


<p>Migrating to a sovereign cloud requires a clear, step-by-step process. A proven exit strategy preserves your negotiation power and long-term freedom. For developers using our object storage S3 API compatibility, the transition is straightforward. Here is a simple checklist to guide your migration.</p><ol><li>Update your application's endpoint configuration to the new EU-based service URL.</li><li>Replicate your existing bucket policies and IAM roles in the new environment.</li><li>Conduct a test migration of a representative dataset, perhaps 1 TB to start.</li><li>Perform a full test restore to validate data integrity and access controls.</li><li>Schedule the full data transfer and update your DNS records accordingly.</li></ol><p><strong>This structured approach minimizes downtime and risk.</strong> For robust ransomware protection, integrate these steps into a 3-2-1 backup strategy using our <a href="/partner/veeam-immutable-s3-api-object-lock">immutable storage with Veeam</a>. A well-planned migration is the final step toward true data control.</p>


Kontinuierliche Verbesserung für nachhaltige Bewertungsqualität


FAQ

Is your S3 API compatibility complete?

Yes, our platform offers full S3 API compatibility. This goes beyond basic read/write operations to include advanced features like versioning, lifecycle management, event notifications, multi-part uploads, and Immutable Storage with Object Lock. Your existing applications, scripts, and tools will work without modification.



How do you ensure data sovereignty?

We are a European company that operates exclusively in certified European data centers. Our governance and infrastructure are strictly under EU law, ensuring compliance with GDPR and shielding your data from foreign jurisdictions and laws like the U.S. CLOUD Act. We also offer country-level geofencing for precise data residency control.



Are there any hidden costs like egress or API fees?

No. Our pricing is transparent and predictable. We have zero egress fees, no charges for API calls (GET, PUT, LIST requests), and no minimum storage duration policies. This allows you to forecast your costs accurately and avoids the surprise charges common with other cloud providers.



What integrations do you support for backup and recovery?

Our S3-compatible object storage integrates out-of-the-box with leading backup and recovery software. We have strong collaborations with vendors like NovaBackup and others in the backup ISV ecosystem, ensuring seamless and certified integration for use cases like tape-to-cloud, disaster recovery, and ransomware protection.



How does your platform help with ransomware protection?

Our primary defense against ransomware is Immutable Storage via S3 Object Lock. This feature allows you to make your backup data unchangeable and undeletable for a defined period. Even if your primary systems are compromised, your immutable backups on our platform remain secure and available for a clean recovery.



Can MSPs use your platform for their clients?

Absolutely. Our platform is partner-ready and designed for MSPs. We offer a multi-tenant management console with role-based access control (RBAC) and MFA, full automation via API/CLI, and clear reporting. The predictable pricing model with no egress fees ensures MSPs can build profitable and scalable Backup-as-a-Service (BaaS) and archiving solutions.



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Impossible Cloud is your European alternative for S3-compatible object storage. Data resides in GDPR-compliant, certified EU data centers; Object Lock and versioning protect against ransomware. Transparent pricing with no egress or API fees. Perfect for backup, archive, and disaster recovery.

Impossible Cloud is your European alternative for S3-compatible object storage. Data resides in GDPR-compliant, certified EU data centers; Object Lock and versioning protect against ransomware. Transparent pricing with no egress or API fees. Perfect for backup, archive, and disaster recovery.

Impossible Cloud is your European alternative for S3-compatible object storage. Data resides in GDPR-compliant, certified EU data centers; Object Lock and versioning protect against ransomware. Transparent pricing with no egress or API fees. Perfect for backup, archive, and disaster recovery.