Cloud Migration Services: A Practical Guide to Moving to the Cloud

Cloud migration is not a single event — it's a programme. Enterprises that treat it as a lift-and-shift "project" often end up with higher costs and lower reliability than they started with. The ones that succeed treat it as a transformation.

Why Migrate to the Cloud?

The business case usually centres on:

• Cost optimisation — pay for what you use; eliminate idle hardware
• Scalability — handle 10x traffic spikes without provisioning 10x infrastructure
• Reliability — multi-region architectures that survive data centre failures
• Developer velocity — managed services mean your team focuses on product, not plumbing
• Security and compliance — enterprise-grade controls built into the platform

But these benefits only materialise if you migrate thoughtfully.

The 6 Rs of Cloud Migration

Rehost (Lift and Shift)

Move VMs to the cloud with minimal changes. Fast, low risk, but captures the fewest cloud benefits. Costs often increase without re-architecting.

Replatform (Lift and Optimise)

Small changes to take advantage of managed services — e.g., move from self-managed MySQL to RDS, or from a VM-hosted app to ECS. Medium effort, medium benefit.

Refactor / Re-architect

Redesign applications to be cloud-native: microservices, serverless, auto-scaling. Maximum benefit, maximum effort. Right for applications with long futures.

Repurchase

Replace an existing application with a SaaS equivalent. Often the right move for commodity functionality (HR, email, CRM).

Retire

Identify applications that are no longer needed. You'd be surprised how many there are.

Retain

Some applications stay on-premises — legacy systems with heavy hardware dependencies, applications with extreme latency requirements, or regulatory constraints.

A real migration strategy assigns each application to one of these 6 Rs. The mix will be different for every organisation.

The Migration Process

Phase 1: Discovery and Dependency Mapping (Weeks 1–4)

Inventory all applications, servers, databases, and integrations. Map dependencies. Identify which systems talk to which. This prevents the situation where you migrate Application A and it silently breaks Application B.

Phase 2: Target Architecture Design (Weeks 3–6)

Design the cloud architecture before you touch anything. VPC design, security groups, IAM policies, network topology. Get this right on paper.

Phase 3: Landing Zone Setup (Weeks 4–8)

Build the cloud foundation: account structure, networking, identity, security baseline, monitoring, billing alerts. This is the infrastructure that everything else will run on.

Phase 4: Pilot Migration (Weeks 6–12)

Migrate 1–3 non-critical applications end-to-end. This is where you discover the surprises — undocumented dependencies, hard-coded IPs, applications that don't behave the same in containers.

Phase 5: Wave Migrations (Months 3–12+)

Migrate remaining applications in groups (waves), typically grouped by dependency and risk. Validate after each wave.

Phase 6: Decommission and Optimise (Ongoing)

Turn off on-premises infrastructure. Right-size cloud resources. Implement auto-scaling. Review Reserved Instance / Savings Plan coverage.

Common Migration Mistakes

Skipping the dependency map — migrating in the wrong order breaks things that weren't supposed to be touched.

Underestimating data migration — migrating a 10TB database with 99.9% uptime requirement is a project in itself.

Ignoring security from day one — security group rules open to 0.0.0.0/0, unencrypted databases, and IAM policies with * permissions are the most common cloud security issues.

Lift-and-shift for applications that need refactoring — some applications are not suitable for direct migration. Recognise them early.

No cost monitoring — cloud bills are variable. Without cost monitoring and budgets, an unexpected traffic spike or misconfigured resource can produce a shocking invoice.

Measuring Success

• Migration velocity — workloads migrated per month
• Cloud cost vs on-premises cost — did the business case materialise?
• Availability — is the migrated application more or less reliable?
• Deployment frequency — are teams shipping faster post-migration?

Speak to our cloud team about your migration programme — we'll help you build a realistic plan and avoid the pitfalls.