Cloud migration — moving your applications, data and infrastructure from on-premise servers to the cloud — is one of the highest-impact technology projects a business can undertake. Done well, it lowers costs, improves reliability and unlocks the ability to scale on demand. Done badly, it causes downtime and runaway bills. The difference is almost always planning.
This guide covers the benefits of cloud migration, the step-by-step process, the main migration strategies, and the pitfalls to avoid.
Why migrate to the cloud?
- Lower and more predictable costs — pay for what you use instead of buying and maintaining hardware that sits idle.
- Scalability — add or remove capacity in minutes to match demand, from a quiet month to a seasonal peak.
- Reliability and resilience — built-in redundancy and backups reduce downtime and data loss.
- Security — leading providers invest more in security and compliance than most businesses could alone.
- Remote-ready — access systems securely from anywhere, supporting hybrid and remote work.
The cloud migration process
1. Assess and plan
Audit your applications and data, map dependencies, and define clear goals — cost, performance, resilience. Decide what to migrate, retire, or rebuild. This stage prevents the majority of failures, because surprises discovered mid-migration are the expensive kind.
2. Choose the right approach
Match each workload to a strategy (see below) rather than treating everything the same.
3. Migrate in stages
Move workloads in controlled phases, starting with lower-risk systems. Test thoroughly at each step and keep a rollback plan, so a problem with one system never takes down the business.
4. Optimise
After migration, right-size resources, automate scaling, and review costs. The cloud only saves money if you actively manage it — switching off unused resources and matching capacity to real demand.
The main migration strategies
- Rehost (“lift and shift”) — move applications as-is. Fast and low-risk, but misses cloud-native benefits.
- Replatform — make a few optimisations during the move, such as a managed database.
- Refactor — re-architect applications to be cloud-native. More effort, but the biggest long-term gains.
- Replace — switch to a SaaS product instead of migrating the old system at all.
Most migrations use a mix, chosen workload by workload. Our IT solutions and services and software development teams can help decide and deliver.
Common pitfalls to avoid
- Migrating without an assessment — leading to surprises, downtime and cost overruns.
- Lifting and shifting everything as-is, missing the chance to modernise where it counts.
- Neglecting security configuration in the new environment (misconfigured storage is a common cause of breaches).
- Forgetting to optimise costs after go-live, so the bill creeps up unchecked.
- Underestimating training, so staff struggle with new tools.
Frequently asked questions
How long does a cloud migration take?
It depends on scale and complexity — a single application might take weeks, while a full infrastructure migration can run several months. A phased approach delivers value early rather than waiting for one big switchover.
Will we have downtime during migration?
With careful planning, most migrations involve little or no downtime. Critical systems are typically moved with techniques that keep them available, and cutovers are scheduled for quiet periods.
Which cloud provider is best?
AWS, Microsoft Azure and Google Cloud are all strong; the right choice depends on your existing tools, skills and workloads. The decision should follow your requirements, not the other way round.
Is the cloud cheaper than on-premise?
It usually is — but only with active cost management. The savings come from paying for what you use and retiring hardware, provided you right-size and switch off what you do not need.
Plan your migration with Progressive Robot
We help businesses move to AWS, Azure and Google Cloud safely, with a clear plan and minimal disruption. Get in touch to scope your cloud migration.
