Cloud Migration Guide for Growing Businesses: Strategy, Steps and Costs to Plan For

Moving applications from on-premise servers or basic hosting to the cloud can improve reliability, security and speed of delivery. But a migration done without a plan can also increase costs and cause downtime. This guide explains how growing businesses can migrate to the cloud safely and get real value from it.

Why businesses move to the cloud

• Reliability: managed infrastructure with backups, redundancy and high availability.
• Scalability: add capacity during peaks and scale down when demand falls.
• Security: modern identity, encryption and monitoring tools built in.
• Speed: teams can create environments and release changes faster.
• Cost visibility: pay for what you use, with detailed reporting by service and team.

The 6 Rs: cloud migration strategies

Not every application should be moved the same way. Common strategies are:

1. Rehost ("lift and shift"): move the application as is to cloud servers. Fastest, but gains the fewest cloud benefits.
2. Replatform: make small changes, such as moving to a managed database, to gain benefits without a rewrite.
3. Refactor: redesign the application to use cloud-native services. Most effort, most long-term benefit.
4. Repurchase: replace the application with a SaaS product.
5. Retire: switch off applications nobody needs.
6. Retain: keep some systems where they are for now.

Most migrations use a mix: rehost or replatform quickly, then refactor the parts that matter most over time.

AWS vs Azure vs Google Cloud

All three are mature, secure and global. The best choice depends on your context:

• AWS has the broadest range of services and a very large ecosystem.
• Microsoft Azure fits naturally if you rely on Microsoft 365, Active Directory or .NET.
• Google Cloud is strong in data analytics, machine learning and Kubernetes.

For most small and medium businesses, factors such as your team's existing skills, the services you need, regional data centres and support matter more than headline features.

Step-by-step cloud migration process

1. Assess

Inventory applications, databases, integrations and dependencies. Note performance, security and compliance requirements, and which systems are business critical.

2. Plan

Choose a strategy for each application, decide the target architecture, estimate costs and define the migration order, usually starting with lower-risk systems.

3. Prepare the foundation

Set up accounts, networking, identity and access management, logging, monitoring and backup policies before moving anything. This "landing zone" keeps the environment secure and organised.

4. Migrate and test

Move applications and data in planned waves. Test functionality, performance and security in the cloud environment before switching users over.

5. Cut over

Switch traffic to the new environment with a rollback plan ready. Schedule the cut-over for low-traffic periods.

6. Optimise

After migration, right-size resources, enable autoscaling, set budgets and alerts, and automate deployments with CI/CD.

Security in the cloud

Cloud providers secure the infrastructure, but you are responsible for how you configure it. Essentials include least-privilege access, multi-factor authentication, encryption of data at rest and in transit, regular patching, centralised logging and tested backups.

Most cloud security incidents come from misconfiguration, such as public storage buckets or over-permissive access, rather than from the provider itself.

Controlling cloud costs

• Turn off development and test environments outside working hours.
• Right-size servers based on real usage, not guesses.
• Use managed services where they reduce operational effort.
• Set budgets and cost alerts from day one.
• Review the bill monthly and tag resources by team or product.

Common cloud migration mistakes

1. Lifting and shifting everything without reviewing architecture or costs.
2. Skipping the security foundation to "move fast".
3. No rollback plan for the cut-over.
4. Forgetting about data transfer and egress costs.
5. Treating migration as the finish line instead of the start of optimisation.

Getting help

A well-planned migration reduces risk and sets you up for faster delivery afterwards. Our cloud services team handles assessment, migration, DevOps and ongoing optimisation, and our custom software engineers can refactor applications to take full advantage of the cloud. Book a cloud review to get started.