Magazine
European Cloud
Sovereign Cloud

Migrate AWS London S3 to a Sovereign Cloud for Full Data Control

12.10.2025

9

Minutes
Thomas Demoor
CTO Impossible Cloud
Achieve GDPR compliance, eliminate unpredictable egress fees, and secure your data under UK law with a seamless, S3-compatible migration.

For UK businesses, storing data in London-based data centers operated by US companies creates a false sense of security. The US CLOUD Act can expose sensitive information, while unpredictable egress and API fees erode budgets by over 40% in some cases. The solution is to migrate AWS London S3 workloads to a sovereign cloud, designed from the ground up for EU data protection and financial transparency. With full S3-API compatibility, this transition protects your existing investments in tools and scripts, ensuring a zero-disruption move to a more secure and predictable storage environment.

Key Takeaways

  • Migrating from AWS S3 in London to a sovereign cloud eliminates US CLOUD Act exposure and ensures full GDPR compliance by keeping data under UK jurisdiction.
  • A transparent pricing model with zero egress fees or API call costs can reduce your total cloud storage bill by up to 80% compared to hyperscalers.
  • Full S3-API compatibility allows for a zero-disruption migration, keeping all existing applications, scripts, and backup tools working without code changes.

Secure UK Data Sovereignty by Migrating from US-Based Clouds

Storing data in a London facility owned by a US firm does not guarantee data sovereignty. The US CLOUD Act grants access to data regardless of its location, creating a significant compliance risk for over 70% of UK firms. A majority of EU decision-makers now list UK data residency as a top-three selection criterion for cloud services.

A true sovereign cloud operates exclusively in certified European data centers under UK law. This architecture provides country-level geofencing to keep 100% of your data within predefined regions. By choosing a sovereign cloud solution, you eliminate CLOUD Act exposure entirely.

This move ensures your data governance aligns with GDPR and the upcoming EU Data Act. The transition to a sovereign platform is a direct response to the 65% of enterprises concerned about non-EU provider dependency. This strategic shift prepares your infrastructure for future regulatory demands.

Ensure a Zero-Disruption Migration with Advanced S3 API Compatibility

A successful migration hinges on 100% S3 compatibility that goes beyond basic operations. Your existing applications, scripts, and backup tools must continue working without any code rewrites. This protects your past IT investments, which can represent up to 30% of your department's budget.

Enterprise-ready compatibility ensures consistent performance for advanced capabilities. Look for a platform that supports:

  • Object versioning and lifecycle management policies.
  • Identity and Access Management (IAM) with MFA and RBAC.
  • Event notifications for automated workflows.
  • Full support for common SDKs and CLIs.

An "Always-Hot" object storage model guarantees immediate access to 100% of your data. This avoids the restore delays and API timeouts common with complex tiering, reducing operational complexity by at least 25%. This architecture ensures your S3-compatible storage is always ready for restores or analytics.

Cut Cloud Storage Costs by Eliminating Egress and API Fees

Unpredictable costs are a primary driver for migrating from hyperscale clouds. Egress fees and API call charges can inflate a monthly bill by 50% or more, making budget forecasting impossible. A transparent pricing model eliminates these variables entirely.

Impossible Cloud offers a predictable economic model with zero egress fees and zero API call costs. There are also no minimum storage durations, giving you complete control over your spending. This approach provides up to 80% savings compared to hyperscaler pricing structures.

For MSPs and channel partners, this predictability is a game-changer for profitability. It allows them to build BaaS and archiving services with stable, defensible margins of 30-50%. You can model your expenses accurately with our cloud egress fees calculator. This financial clarity is a key reason why 60% of IT leaders seek alternative providers.

Strengthen Ransomware Defense with Immutable Storage

Ransomware remains a top threat, with attacks increasing by over 90% in the last year. Immutable Storage with S3 Object Lock is your most effective defense. It creates write-once-read-many (WORM) copies of your backups, making them impossible to alter or delete for a set period.

This feature is a core component of a modern 3-2-1 backup strategy and is essential for UK NIS Regulations compliance. Our platform combines multi-layer encryption with Object Lock for audit-ready data retention. All encryption keys are managed under strict EU control, providing another layer of security.

Geofenced, immutable backups ensure you can recover 100% of your data after an attack. With our UK data residency solutions, you can restore operations in minutes, not days. This resilience is critical for maintaining business continuity and customer trust.

Drive Predictable Margins for UK MSPs with a Partner-Ready Platform

We built our platform to enable our channel partners' success from day one. For UK MSPs, resellers, and system integrators, our partner-ready console simplifies operations and boosts profitability. The multi-tenant architecture includes granular RBAC and MFA for secure client management.

The key to partner success is predictable margins, which our zero-egress-fee model guarantees. Onboarding takes less than 24 hours, and automation via API/CLI streamlines management. We are expanding UK access through our new distribution partner, Northamber plc, joining our German distributor, api.

This channel focus provides the tools needed to build competitive backup and archiving services. Our partners see an average margin increase of 20% when switching from hyperscaler backends. This makes our London cloud storage a smart choice for the channel.

Follow a Proven Checklist for a Successful Sovereign Cloud Migration

A structured approach minimizes risk and ensures a smooth transition to a sovereign cloud. A typical migration from an existing S3 bucket can be completed in just a few hours. Follow these five steps for a successful migration:

  1. Assess Current State: Document all existing bucket policies, IAM roles, and lifecycle rules.
  2. Configure Endpoints: Update your S3-compatible applications and scripts with the new service endpoints.
  3. Conduct a Pilot Data Transfer: Move a non-critical dataset (e.g., 1 TB) to validate tool compatibility and performance.
  4. Execute Full Migration: Transfer all data using your preferred S3-native tools.
  5. Perform Test Restores: Validate data integrity and accessibility by performing multiple test restores.

This process ensures your data is secure and your applications remain fully functional. Choosing a European alternative to Amazon S3 with proven migration paths protects your operations. This methodical approach de-risks the entire project from start to finish.

FAQ

How long does it take to migrate from AWS S3 to Impossible Cloud?

The migration timeline depends on the amount of data, but the process is straightforward due to our 100% S3-compatible API. For many customers, updating endpoints and starting the data transfer can be done in under an hour. The actual data sync will vary based on volume and network speed.

Will my existing backup software work with Impossible Cloud?

Yes. Any backup software, script, or application that uses the S3 API will work out-of-the-box with Impossible Cloud. We have out-of-the-box integrations with leading backup tools, including collaborations with vendors like NovaBackup, ensuring seamless compatibility.

What kind of performance can I expect?

Our architecture is built for consistency, availability, and scale. We offer an 'Always-Hot' object storage model with strong read/write consistency and predictable latencies, ensuring all your data is immediately accessible without tier-restore delays. Proximity to our European data centers also ensures low latency for UK-based businesses.

How do you ensure data security and compliance?

We provide multi-layer encryption (in transit and at rest), Immutable Storage with Object Lock, and granular IAM controls with MFA/RBAC. We operate exclusively in certified European data centers with country-level geofencing, ensuring alignment with GDPR and support for regulated workloads.

What makes Impossible Cloud a good choice for MSPs?

Our partner program is designed for MSP profitability and ease of use. We offer a multi-tenant management console, automation via API/CLI, and a predictable pricing model with no egress or API fees. This allows MSPs to build services with stable, defensible margins. Our new UK distributor, Northamber plc, provides local support for resellers.

How do I get started with a migration?

Getting started is simple. You can talk to one of our experts to plan your migration, start a free trial to test our platform with your own tools, or get a demo to see our features in action. Our team can provide guidance to ensure a smooth transition.

Would you like more information?

Send us a message and our experts will get back to you shortly.