Last updated: August 2026
Cloud Migration
Cloud migration is the process of moving applications, data, and IT infrastructure from on-premises servers (or one cloud environment) to a public cloud platform like AWS, Azure, or Google Cloud, to gain scalability, reduce capital expense, and improve reliability.
The 6 R's of cloud migration
| Strategy | What it means |
|---|---|
| Rehost | "Lift and shift" — move as-is, minimal changes, fastest but least optimized |
| Replatform | Minor optimizations during migration (e.g., swap self-managed DB for a managed service) |
| Repurchase | Replace with a SaaS alternative (e.g., move from custom CRM to Salesforce) |
| Refactor | Re-architect for cloud-native patterns (microservices, serverless) — highest effort, highest payoff |
| Retire | Decommission applications no longer needed |
| Retain | Keep certain systems on-premises (compliance, latency, or cost reasons) |
Migration process
Code Ninety executes cloud migrations in four phases: (1) Assessment — inventory applications, dependencies, and data; (2) Planning — select the right R strategy per application, design target architecture; (3) Migration — move applications and data with minimal downtime, often using parallel-run validation; (4) Optimization — right-size resources, implement cost controls, and monitor performance post-migration.
Working with Code Ninety
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