Public Cloud Migration: Benefits, Risks, and How to Plan It

By The Uptime Report editorial team · Last updated October 2026

Public cloud migration moves your systems to a shared cloud platform like AWS, Azure, or Google Cloud. It pays back when done right, the average migration returns $3.86 per dollar spent, but 70% of migrations still exceed cost or time.

What is public cloud migration?

Public cloud migration is the process of moving applications, data, and infrastructure to a shared cloud platform operated by a provider, most commonly AWS, Microsoft Azure, or Google Cloud. “Public” means the infrastructure is shared across many customers, with each isolated securely. Adoption is near-universal: 94% of enterprises use at least one cloud service, and 91% have migrated at least one workload. The payoff is real: the average migration returns $3.86 per dollar spent.

What are the benefits of public cloud migration?

• Cost: pay for what you use; strong ROI on average.
• Scale: provision and retire resources on demand.
• Resilience: built-in redundancy and recovery.
• Speed: deploy faster without buying hardware.

Public cloud services are forecast to grow 21.3% in 2026, reflecting how central the model has become.

What are the risks of public cloud migration?

The main risk is overrun. 70% of cloud migrations exceed cost or time, 38% exceed budget by an average of 14-23%, and 47% of delays come from legacy dependencies not identified during assessment. Security is a shared responsibility: the provider secures the infrastructure, but you secure your configurations, and misconfiguration causes most cloud breaches. These risks are managed, not eliminated, by disciplined planning.

How do you plan a public cloud migration?

With discovery first. Map every workload and its dependencies, choose a migration strategy per workload (the 6 Rs), move in controlled waves with tested rollback, and apply financial governance to control spend. The migrations that finish on budget are the ones that invested in assessment before moving. Tooling and, on complex moves, migration consulting close the gaps that cause overruns (Medha Cloud tracks migration data).

Frequently asked questions

What is public cloud migration?

Moving applications, data, and infrastructure to a shared cloud platform like AWS, Azure, or Google Cloud, where infrastructure is shared but each customer is isolated.

What are the benefits of public cloud migration?

Pay-per-use cost with strong ROI ($3.86 per dollar on average), on-demand scale, built-in resilience, and faster deployment without buying hardware.

What are the risks of public cloud migration?

Cost and time overruns (70% exceed plan), legacy dependency delays, and misconfiguration, which causes most cloud breaches under the shared responsibility model.

How much does public cloud migration save?

It returns $3.86 per dollar spent on average, with compute and storage savings that depend on the workload and platform.

How do you plan a public cloud migration?

Start with discovery and dependency mapping, choose a strategy per workload, move in waves with tested rollback, and apply financial governance.

Which public cloud is best for migration?

AWS, Azure, and Google Cloud each lead in different areas. The best choice depends on your existing stack, skills, and workload requirements.