The Cloud Migration Decision Is More Nuanced Than It Looks
Moving your workloads to the cloud is one of the most impactful infrastructure decisions an organization can make. But "migrating to the cloud" is not a single action — it's a spectrum of approaches with very different implications for cost, complexity, timeline, and long-term value.
Understanding your options before you commit can save significant time, money, and organizational disruption.
The 6 Rs of Cloud Migration
The industry has converged on a framework often called the "6 Rs" to categorize migration strategies. Each approach is appropriate for different workloads and business contexts.
| Strategy | Description | Best For |
|---|---|---|
| Rehost (Lift & Shift) | Move applications as-is to cloud infrastructure with minimal changes. | Quick migration, legacy apps, short-term cost reduction |
| Replatform | Make minor optimizations during migration without changing core architecture. | Apps that can benefit from managed services with low effort |
| Refactor / Re-architect | Redesign the application to be cloud-native (microservices, containers, etc.). | Strategic systems requiring scalability and agility |
| Repurchase | Replace the existing application with a SaaS alternative. | Commodity functions (CRM, HR, email) |
| Retire | Decommission applications that are no longer needed. | Redundant or unused systems |
| Retain | Keep certain workloads on-premises for now. | Systems with regulatory constraints or recent investment |
How to Assess Each Workload
Not every application in your portfolio should follow the same path. A thorough application portfolio assessment should evaluate each workload on:
- Business criticality: How dependent is the business on this system?
- Technical complexity: How tightly coupled is it to other systems or infrastructure?
- Age and maintainability: Is it well-documented and actively maintained?
- Compliance requirements: Are there data residency or regulatory constraints?
- Total cost of ownership: What does it cost to run today vs. in the cloud?
Common Migration Mistakes to Avoid
- Treating cloud migration as purely a cost exercise. Cost savings are real but not guaranteed without optimization. The bigger wins often come from agility and resilience.
- Migrating everything at once. A phased approach — starting with lower-risk workloads — lets your team build skills and confidence before tackling complex systems.
- Neglecting security and compliance early. Cloud security is a shared responsibility model. Define your security architecture before migration, not after.
- Forgetting about data transfer costs. Egress fees can be a surprise in cloud billing. Model your data flows carefully during planning.
Choosing a Cloud Provider
The major hyperscalers — AWS, Microsoft Azure, and Google Cloud — each have distinct strengths. AWS offers the broadest service catalog and market maturity. Azure integrates deeply with Microsoft enterprise tools. Google Cloud excels in data analytics and AI/ML capabilities. A multi-cloud or hybrid strategy may make sense, but adds operational complexity that should not be underestimated.
Planning for Post-Migration Success
Migration is the beginning, not the end. Cloud environments require ongoing management: cost optimization (FinOps), performance monitoring, security posture reviews, and continuous architecture refinement. Organizations that treat cloud migration as a one-time project consistently overspend and underperform compared to those that invest in ongoing cloud operations capability.
Conclusion
The right cloud migration strategy depends on your unique combination of workloads, organizational maturity, and business goals. Take the time to assess before you act, choose migration paths workload by workload, and invest in the operational discipline to run cloud environments effectively.