Cloud Migration Overview for Businesses Moving to the Cloud
September 30, 20268 min readSara Ahmed
Moving a business to the cloud used to be a multi-year IT project reserved for large enterprises. Today it's a practical option for businesses of almost any size, but it's still a project with real risk if it's rushed, under-planned, or handed to a team without migration experience. This overview walks through what cloud migration involves, the strategies businesses use to get there, what it costs, and how to avoid the mistakes that turn a migration into a budget overrun.
1. What Is Cloud Migration?
Cloud migration is the process of moving digital business operations, applications, data, and infrastructure from on-premises servers (or one cloud provider) into a cloud computing environment such as AWS. For most businesses, this means retiring physical servers and rebuilding or relocating workloads onto cloud infrastructure that can scale on demand, without the up-front capital cost of owning hardware.
Migration ranges from a straightforward lift and shift of an existing application to a full redesign that takes advantage of cloud-native services. Which approach fits depends on the workload, the timeline, and how much the business wants to invest in modernisation alongside the move.
2. Why Businesses Are Moving to the Cloud in 2026
Cloud adoption is no longer a debate; it's now a question of how to do it well. Flexera's 2026 State of the Cloud Report, based on responses from more than 750 cloud decision-makers, found generative AI use in production climbing to 81% of organisations, up from 72% the year before and 47% in 2024, as AI workloads become a mainstream driver of new cloud adoption.
• Businesses move to the cloud to replace unpredictable capital spending on hardware with elastic, pay-for-what-you-use infrastructure.
• Cloud infrastructure separates services into independent components, making it easier to improve uptime and recover quickly from outages.
• AWS alone has committed roughly AU$20 billion to Australian data centre infrastructure between 2025 and 2029, reinforcing regional capacity and data residency options for Australian businesses.
3. The 6 R's: Common Cloud Migration Strategies
StrategyWhat It MeansBest Fit Rehost Lift and shift — move an application to the cloud with minimal changes Fast timelines, limited budget for redesign Replatform Make small optimisations during the move (e.g., managed database) without a full rebuild Workloads that benefit from modest cloud-native gains Repurchase Replace an existing application with a cloud-based SaaS alternative Ageing software nearing end of life Refactor Rebuild the application to be cloud-native Strategic, long-lived applications with growth ahead Retire Decommission applications no longer needed Redundant or overlapping systems found during assessment Retain Keep a workload on premises for now Systems with compliance, latency, or dependency constraints
Most migrations blend several of the 6 R's across a portfolio of applications rather than applying one strategy to everything. A proper workload assessment early in the process is what determines the right mix.
4. Cloud Migration Costs and the Waste Problem
Cost is where migrations most often go wrong, not during the move itself, but afterward. Flexera's 2026 report puts wasted cloud spend at 29%, the first increase in five years after a steady decline, with the rise attributed largely to generative AI workloads that were stood up quickly and never optimised. Security and compliance were cited as the top AI-related cloud challenge by 53% of respondents.
The lesson for any business planning a migration: the initial move is only half the cost story. A migration plan that doesn't include post-migration cost governance, commonly called FinOps, is likely to see savings erode within the first year.
5. A Step-by-Step Cloud Migration Process
Assess current workloads, dependencies, and data to build a full inventory before deciding what moves and how.
Choose a strategy for each workload using the 6 R's framework, rather than a single blanket approach.
Design the target cloud architecture, using a framework such as the AWS Well-Architected Framework to guide reliability, security, and cost decisions.
Clone and validate the environment in the cloud alongside the existing system, testing functionality before anyone depends on it.
Execute a planned cutover, ideally with a rollback path if something doesn't validate as expected.
Decommission legacy infrastructure once the new environment is confirmed stable.
Put ongoing cost governance and monitoring in place so savings don't erode after the project team moves on.
6. Zero-Downtime Migration
Zero downtime doesn't mean nothing happens during the migration; it means the business-facing system stays available throughout. In practice, this relies on three things: a cloned target environment that's fully validated before go-live, data replication that keeps the new environment in sync with the old one right up to cutover, and a cutover window planned around real usage patterns rather than convenience.
A rollback plan is just as important as the forward plan. If validation reveals a problem after cutover, the ability to fail back to the original environment quickly is what turns a mistake into a minor delay instead of an outage.
7. Common Cloud Migration Risks and How to Avoid Them
• Underestimating data dependencies — mitigated by a thorough assessment phase before any migration wave is scheduled.
• Downtime during cutover — mitigated by cloning and validating the target environment before switching traffic over.
• Cost overruns after go-live — mitigated by establishing FinOps monitoring and budget alerts from day one, not as an afterthought.
• Security gaps introduced during the move — mitigated by applying a recognised framework (AWS Well-Architected, ISO 27001) rather than replicating old on-premises assumptions in the new environment.
• Skills gaps on the internal team — mitigated by pairing internal staff with an experienced migration partner rather than learning entirely on the job.
8. Cloud Migration for Small Business vs. Enterprise
Small businesses typically benefit most from a straightforward rehost or repurchase strategy, moving existing applications as-is or switching to a SaaS alternative with a managed provider handling the technical work so there's no need to build an internal cloud team. Enterprises more often run phased, multi-wave migrations that blend all 6 R's across dozens or hundreds of applications, with dedicated governance for cost, security, and compliance built in from the start.
Regardless of size, the businesses that get the best outcome share one habit: they treat migration as the start of an ongoing cloud operating model, not a one-off project that ends at cutover.
9. Choosing a Cloud Migration Partner
A good migration partner brings a documented process, not just cloud credentials. Look for a clear methodology (assessment, validation, cutover), transparency about what's included in migration cost versus ongoing management, and evidence of handling workloads like yours, whether that's a straightforward website move or a complex, regulated enterprise application.
Conclusion
Cloud migration isn't a single event; it's the start of how a business runs its infrastructure going forward. The organisations getting real value from the cloud share three habits: they choose the right strategy per workload instead of a one-size-fits-all approach, they plan cutover around validation and rollback rather than hope, and they put cost governance in place before waste has a chance to accumulate.
If your business is weighing a move to the cloud or inherited a migration that never quite got optimised, Nuwair Systems can assess your current environment and plan a zero-downtime path to AWS.Start with a Cloud Migration Assessment with us.
FAQ Section
What is cloud migration?
Cloud migration is the process of moving applications, data, and infrastructure from on-premises servers, or from another cloud provider, into a cloud computing environment such as AWS.
What are the 6 R's of cloud migration?
The 6 R's are rehost, replatform, repurchase, refactor, retire, and retain, a framework for deciding how each workload should move to the cloud, if at all.
How much does cloud migration cost?
Cost depends on the number and complexity of workloads, the strategy chosen for each, and how much modernisation happens alongside the move. Simple rehosts cost far less than full application refactors.
How long does cloud migration take?
A single application rehost can take weeks; a multi-application enterprise migration with modernisation can take many months, typically executed in phased waves rather than all at once.
Is cloud migration secure?
It can be more secure than on-premises infrastructure when done well, using a recognised framework such as AWS Well-Architected and applying security controls deliberately rather than copying old assumptions into the new environment.
What is zero-downtime migration?
Zero-downtime migration means the business-facing system stays available throughout the move, achieved by cloning and validating the target environment before cutover and keeping a rollback path ready.
What is a cloud readiness assessment?
A cloud readiness assessment is the inventory and analysis phase that identifies which workloads, data, and dependencies exist before deciding a migration strategy for each one.
Should small businesses migrate to the cloud?
Many small businesses benefit from a simple rehost or a switch to SaaS alternatives, especially when a managed provider handles the technical migration work.
What is the difference between rehosting and refactoring?
Rehosting moves an application to the cloud with minimal changes lift and shift. Refactoring rebuilds the application to be cloud-native, taking more time and investment but unlocking more cloud-specific benefits.
What is cloud repatriation and why is it happening?
Cloud repatriation is when businesses move some workload back out of the public cloud, usually driven by cost. Industry reports show it remains a minority trend, with most organisations still expanding cloud use overall.
