What Are the 3 Phases of AWS Cloud Migration?

According to IDC, customers who migrate to AWS see their operational costs reduced by 51 percent and a significant increase in IT staff productivity. 

As we enter 2025, AWS continues redefining the cloud landscape with groundbreaking advancements in artificial intelligence and cloud computing. This year brings a wave of innovations, from cutting-edge data center transformations to the introduction of powerful new foundation models and significant enhancements to existing services. 

Businesses that embrace AWS can unlock unprecedented scalability, efficiency, and intelligence in their operations. Migrating to AWS in 2025 is not just an upgrade—but a strategic move to stay competitive in an increasingly AI-driven world.

And an AWS cloud migration services provider can tailor the process to meet your organisation’s needs. They provide the tools, training, expertise, and security you require at every stage, regardless of the deployment size.

In this blog, we’ll explore what sets AWS migration apart from other cloud solutions and take a deep dive into the three key phases of migrating to AWS.

Why AWS Cloud?

Did you know that AWS plans to invest €7.8B into the AWS European Sovereign Cloud, set to launch by the end of 2025?

As businesses push forward with digital transformation, AWS remains the top choice for cloud computing. With its unmatched market presence, relentless innovation, and massive global infrastructure, AWS is shaping the future of the cloud. Here’s why:

1. Still the Market Leader

AWS holds the biggest cloud market share, outpacing competitors like Microsoft Azure and Google Cloud. With over 200 fully-featured services covering everything from AI to IoT, it’s the all-in-one cloud platform that businesses rely on.

2. Constant Innovation

AWS is always ahead of the curve with cutting-edge solutions like SageMaker for AI, AWS Lambda for serverless computing, and EKS/ECS for containers. These technologies align with key trends like AI, edge computing, and hybrid cloud, keeping AWS at the forefront of enterprise modernisation.

3. Global Scale, Seamless Expansion

With a vast network of data centers worldwide, AWS offers low-latency, highly scalable solutions while ensuring compliance with local regulations. Whether businesses are scaling locally or globally, AWS makes it easy.

4. Cost-Effective & Flexible

The pay-as-you-go model keeps cloud costs in check, letting businesses scale up or down as needed. Whether you’re a startup or a large enterprise, AWS provides the flexibility to innovate without overspending.

5. A Thriving Ecosystem

AWS’s strong developer community and extensive partner network fuel innovation across healthcare, fintech, and media industries. With seamless integrations and robust support, AWS continues to be the backbone of cloud-first strategies.

3 Phases of AWS Migration

Moving to the cloud isn’t just about shifting workloads—it’s about transforming how your business operates. AWS has a tried-and-tested three-phase migration approach refined through thousands of successful migrations. Each phase builds on the last, ensuring a smooth, strategic, and efficient transition.

1. Assess: Getting Cloud-Ready

Before making the move, you need a clear picture of your current IT setup. The Assess phase is about evaluating your infrastructure, applications, and data to determine what’s cloud-ready and needs work.

Here’s what happens in this phase:

• Analysing workloads, dependencies, and performance needs
• Taking stock of applications, data, and infrastructure
• Weighing costs, potential risks, and business goals
• Mapping out the complexity and scope of migration

Tools: AWS provides tools like Migration Evaluator, Application Discovery Service, and Cloud Adoption Readiness Tool (CART) to help you assess everything upfront, ensuring no surprises down the road.

2. Mobilise: Laying the Groundwork

With a solid assessment in hand, the next step is to Mobilise—setting up the right resources, teams, and processes for migration. This phase ensures your cloud foundation is strong before making the big move.

Key steps in this phase:

• Establishing a cloud foundation (AWS Landing Zone, networking, accounts)
• Addressing security, compliance, and governance needs
• Assembling the right team and setting up communication channels
• Creating a detailed migration roadmap, including priorities and dependencies

Tools: AWS’s Migration Acceleration Program (MAP) helps businesses streamline this phase, reducing risks and ensuring a well-organised transition.

The 7Rs of Cloud Migration: Choosing the Right Path for Your Workloads

When moving to the cloud, not all applications follow the same path. That’s where the 7R framework comes in—it helps you determine the best cloud transformation strategy for each workload based on your business needs. Here’s a quick rundown of the 7R’s:

3. Migrate & Modernise: Making the Move

Now comes the action phase—Migrate & Modernise. This is where you actually move applications, data, and workloads to AWS. But it’s not just about migration—it’s also about optimising and modernising along the way.

What happens in this phase:

• Running pilot migrations to test the waters
• Executing the full migration based on your roadmap
• Monitoring workloads for performance, security, and compliance
• Fine-tuning and modernising applications post-migration

Tools: AWS tools like Migration Hub and AWS Managed Services help ensure a smooth migration while keeping everything secure and optimised. If your industry has strict security and compliance requirements, this phase ensures you meet them without hiccups.

Also, monitoring plays a crucial role in maintaining software, but in today’s cloud-driven world, it’s more important than ever. As businesses move their operations to the cloud, keeping applications secure, reliable, and always available is a top priority.

AWS provides a range of monitoring tools to help users stay on top of their cloud environments, but two of the most widely used are CloudTrail and CloudWatch. In this post, we’ll break down both tools, highlighting their key features, capabilities, and their key differences.

Best Practices for a Smooth AWS Migration

1. Create a Solid Migration Strategy 

A clear strategy is essential for a successful migration. Start by assessing your current IT environment—applications, data, and infrastructure. Then, identify your main goals and create a roadmap for each phase of the migration journey.

Steps to Follow:

• Assessment: Review your applications and workloads to see if they’re ready for cloud migration. Consider performance, dependencies, and compliance needs.
• Planning: Develop a detailed plan with timelines, resources, and risk management strategies. Make sure roles and responsibilities are clearly defined.

2. Pick the Right Migration Approach 

There are different migration methods to choose from, and which one you select will depend on your needs. Common options include:

• Rehost (Lift-and-Shift): Move applications to AWS without making many changes. This is a fast option for quick migrations.
• Replatform (Lift-and-Reshape): Make minor changes to optimise apps for the cloud as they’re migrated.
• Refactor: Completely redesign and rebuild applications to take full advantage of AWS’s cloud services and architecture.

3. Leverage AWS Migration Tools and Services 

AWS provides powerful tools and services to simplify migration, reducing errors and boosting efficiency.

Essential Tools:

• AWS Migration Hub
• AWS Server Migration Service (SMS)
• AWS Database Migration Service (DMS).
• AWS Application Discovery Service

4. Prioritise Data Integrity and Security 

Ensuring the security and integrity of your data during migration is crucial. Make sure to implement strong security measures and follow relevant regulations.

Best Practices:

• Data Encryption: Always encrypt data, both while it’s moving and when it’s stored.
• Access Controls: Use AWS Identity and Access Management (IAM) to manage who has access to what.
• Backup and Recovery: Regularly back up data and set up recovery processes to prevent data loss.

5. Conduct Thorough Testing and Validation 

Before you complete the migration, it’s important to test everything thoroughly to ensure that apps and data are working properly in the AWS environment. This includes checking performance, security, and compatibility.

Testing Activities:

• Functional Testing: Make sure your apps perform their intended tasks.
• Performance Testing: Ensure apps meet performance standards in the AWS environment.
• Security Testing: Run security checks to identify vulnerabilities and ensure compliance with security policies.

6. Monitor and Optimise After Migration 

Once your migration is complete, continuous monitoring and optimisation are key to maintaining an efficient AWS environment. Use AWS’s tools to track performance, manage costs, and adjust where necessary.

Tools to Use:

• Amazon CloudWatch
• AWS Cost Explorer
• AWS Trusted Advisor

Get the Full Value of AWS Cloud with Deployflow

AWS offers access to some of the most innovative services and tools available. With the help of dedicated APN partners, cloud consulting, and cloud migration experts, you’ll experience a smooth and secure cloud transformation tailored to your business needs. 

Using the AWS Cloud Adoption Framework, they’ll guide you through how cloud adoption can revolutionise your operations while addressing any skill gaps or process challenges.

Once your migration is complete, the real magic happens. You can focus your valuable IT resources on building innovative apps that enhance customer experiences rather than getting bogged down by the day-to-day management of infrastructure and data centers.

Ready to take the leap into the cloud? A Deployflow team of experts can help craft a migration strategy that fits your unique needs. Explore our cloud migration services and reach out to our team of experts to learn how we can help you achieve the maximum value of the cloud no matter where you are on your cloud journey. 

FAQs