The Complete Cloud Migration Playbook: From Legacy to Cloud-Native in 12 Months

Cloud migration remains one of the most impactful — and most complex — initiatives an enterprise can undertake. After guiding 150+ organizations through their cloud journeys, we've distilled our approach into a comprehensive playbook.

Phase 1: Discovery & Assessment (Months 1-2)

The foundation of any successful migration is a thorough understanding of your current state. This means inventorying every application, database, and integration point, then categorizing them using the 7 Rs framework:

• Rehost (Lift & Shift) — Move as-is to cloud infrastructure
• Replatform — Make minimal changes to leverage cloud services
• Refactor — Re-architect for cloud-native patterns
• Repurchase — Replace with SaaS alternatives
• Retire — Decommission applications no longer needed
• Retain — Keep on-premises (for now)
• Relocate — Move to a different cloud region or provider

Phase 2: Planning & Architecture (Months 2-4)

With your inventory categorized, the next step is designing your target architecture. Key decisions include:

Multi-Cloud vs. Single Cloud: Our recommendation is to start with a primary cloud provider (AWS, Azure, or GCP based on your existing ecosystem) and adopt multi-cloud only where specific workloads demand it.

Landing Zone Design: Establish your cloud foundation with proper networking, identity management, security controls, and governance frameworks before migrating any workloads.

Cost Modeling: Cloud costs can spiral without proper planning. We build detailed cost models that account for compute, storage, data transfer, and managed service fees.

Phase 3: Migration Execution (Months 4-10)

Execute migrations in waves, starting with lower-risk applications to build team confidence and refine processes. Each wave should include:

1. Pre-migration testing and validation
2. Data migration and synchronization
3. Application cutover with rollback plans
4. Post-migration verification and optimization

Phase 4: Optimization & Operations (Months 10-12)

Migration is not the finish line — it's the starting line. Post-migration optimization typically yields 20-40% additional cost savings through right-sizing, reserved instances, and architectural improvements.

Planning a cloud migration? Our certified cloud architects can help you build a migration strategy tailored to your enterprise. Schedule a consultation.