Cloud Migration Strategy: The Complete Guide for Enterprise Teams

Cloud migration is one of the most consequential technology decisions an enterprise makes. Done right, it delivers dramatic cost savings, infinite scalability, and faster innovation cycles. Done wrong, it creates technical debt, security vulnerabilities, and disruption that takes years to recover from.

The 6 Migration Strategies (The "6 Rs")

1. Rehost (Lift & Shift) – Move as-is to cloud VMs. Fast but doesn't leverage cloud-native benefits.

2. Replatform – Minor optimisations during migration (e.g., moving to managed databases). Good balance of speed and value.

3. Refactor/Re-architect – Rebuild for cloud-native architecture (microservices, containers). Highest ROI but most effort.

4. Repurchase – Move to a SaaS solution instead. Often right for CRM, HR, email.

5. Retain – Keep on-premises for now. Some legacy systems are simply not ready.

6. Retire – Decommission applications no longer needed. Often 10–20% of the portfolio.

Choosing the Right Cloud Model

Public Cloud (AWS, Azure, GCP): Best for variable workloads, global reach, and minimising infrastructure management.

Private Cloud: Required for highly regulated industries (banking, healthcare, defence) with strict data sovereignty requirements.

Hybrid Cloud: The pragmatic choice for most enterprises—sensitive workloads on-premises, variable workloads on public cloud.

The Top Migration Mistakes

• Under-investing in the discovery and assessment phase
• Migrating legacy monoliths without modernisation
• Neglecting FinOps from day one (cloud bills can explode without governance)
• Underestimating security and compliance requirements

Tech Azur's Migration Methodology

We begin every migration engagement with a thorough application portfolio assessment. Every application is evaluated on business criticality, technical debt, and cloud-readiness. Only then do we define the migration wave plan, ensuring zero disruption to business operations.