A cloud migration strategy gives Australian businesses a clear plan for moving applications, data, and infrastructure into a cloud environment without losing control of cost, security, compliance, or day-to-day operations.
For many businesses, cloud migration starts with a simple goal: reduce reliance on ageing infrastructure, improve scalability, support hybrid work, or make business operations easier to manage. The harder question is how to move. Some workloads can shift with minimal change. Others need selective improvement. Some may need deeper redesign before cloud can deliver long-term value.
That is why rehost, replatform, and refactor decisions matter. Each approach can be valid, but each comes with different cost, timing, technical, and governance implications.
For a closer look at the security side of cloud adoption, see our guide to Cloud Security Services: Protecting Your Business Data in the Cloud.
What a Cloud Migration Strategy Needs to Decide
A cloud migration strategy sets the direction for how systems, applications, and data will move from their current environment into cloud infrastructure or cloud-based services.
It should answer practical questions before technical work begins.
Key Decisions to Make Early
A strong migration plan should identify:
- Which workloads should move first
- Which systems should stay where they are for now
- Which applications need improvement before migration
- What data needs additional protection
- What cloud solution is suitable for each workload
- How users will be affected
- How the business will manage cost after migration
- What support is needed once systems are live
This planning matters because cloud migration affects more than servers. It can change how staff access applications, how data is stored, how backups are managed, how systems are monitored, and how IT budgets are measured.
The Australian Government’s Digital Transformation Agency has reinforced the importance of planned cloud adoption. Its cloud policy for government highlights coordinated planning, secure adoption, cost transparency, governance, and cloud capability as requirements for modern cloud use.
For an overview of the main migration pathways, readCloud migration strategies: which one is right for your business?
Assessing Workloads Before Choosing a Migration Approach
Different workloads often need different migration approaches. A finance system, customer database, file server, internal application, and public website may all have different requirements.
Moving everything the same way can create avoidable issues. Some applications may be ready for a straightforward move. Others may have outdated dependencies, performance limitations, or integration requirements that need attention first.
What to Assess
Before choosing between rehost, replatform, and refactor, businesses should review:
- Business importance: How critical is the workload to daily operations?
- Application age: Is the system modern, legacy, custom-built, or heavily modified?
- Dependencies: What other systems, databases, users, or integrations rely on it?
- Data sensitivity: Does it store customer, employee, financial, or health information?
- Performance needs: Does it need low latency, high availability, or strong scalability?
- Licensing: Will existing licences still apply in the cloud environment?
- Security controls: Are current access controls, logging, and monitoring suitable?
- Backup and recovery: How quickly does the system need to be restored after an outage?
- User impact: What will change for staff, clients, or partners?
This assessment helps avoid treating cloud migration as a single project with one technical answer.
A practical cloud migration strategy may use rehost for one workload, replatform for another, and refactor for a business-critical application that needs long-term improvement.
For a more detailed planning sequence, see Cloud Migration Strategies: Steps to a Successful Transition.
Comparing Rehost, Replatform, and Refactor
Rehost, replatform, and refactor are three common cloud migration approaches. Microsoft’s Cloud Adoption Framework explains that the right approach should be based on the business driver behind each workload: Select your cloud migration strategies.
Rehost: Moving Workloads With Minimal Change
Rehost is often called “lift and shift”. It involves moving a workload to cloud infrastructure with limited change to the application itself.
This can suit systems that are stable, compatible with cloud infrastructure, and need to move quickly.
Rehost can work well when:
- The application is still useful
- The current infrastructure is nearing replacement
- The business wants a faster migration path
- There is limited appetite for application change
- The workload does not need immediate modernisation
The trade-off: Rehost can help a business move quickly, but it may also carry existing inefficiencies into the cloud. If an application already has performance or reliability problems, moving it as-is may preserve those problems.
Replatform: Making Targeted Improvements
Replatform sits between rehost and refactor. The application is moved to a more suitable cloud environment, often with targeted changes to hosting, databases, or supporting services.
This can suit workloads that are still valuable but would benefit from better scalability, reliability, or manageability.
Replatform can work well when:
- The application does not need a full rewrite
- Cloud services can reduce infrastructure management
- Database or hosting improvements are practical
- The business wants more value than a basic lift and shift
- The workload can tolerate some testing and adjustment
The trade-off: Replatform requires more planning than rehost. It also needs careful testing around integrations, user access, data flow, and performance.
Refactor: Changing the Application for Cloud
Refactor involves changing application code or structure so the workload can operate more effectively in cloud.
This is usually the most complex of the three approaches, but it can also provide the strongest long-term value when an application needs to scale, integrate, or evolve.
Refactor can work well when:
- The application is strategically important
- Existing architecture limits performance or scalability
- The business needs better resilience
- Code or architecture needs long-term improvement
- Cloud-native services will support future development
- Improving performance is part of the business case
The trade-off: Refactor takes more time and technical capability. It should be reserved for workloads where the business case is clear.
How to Choose the Right Migration Approach
The best migration approach depends on the workload, the business goal, and the level of change the organisation can support.
When Rehost Makes Sense
Rehost may be suitable when the priority is speed, infrastructure replacement, or a lower-change move.
It can be useful for stable systems where the business needs to reduce reliance on on-premises hardware without redesigning the application.
A rehost-first approach may suit workloads such as:
- Internal applications with limited change requirements
- Stable file or application servers
- Systems with clear cloud compatibility
- Workloads approaching hardware refresh deadlines
When Replatform Makes Sense
Replatform may be suitable when a workload is worth keeping, but the current hosting model is holding it back.
It can be useful where the business wants to reduce infrastructure management, improve scalability, or use managed cloud services without committing to a full rebuild.
Replatforming may suit:
- Databases that can move to managed services
- Web applications that can move to platform services
- Workloads needing improved reliability
- Applications with manageable dependencies
When Refactor Makes Sense
Refactor may be suitable when the application plays an important role in future business plans.
It can support better scalability, maintainability, and integration, but it needs a stronger business case because the work is more involved.
Refactoring may suit:
- Customer-facing applications
- High-value internal platforms
- Applications with ongoing performance issues
- Systems that need modern integration or automation
- Workloads that will keep evolving over time
Some migrations involve moving different workloads in different ways. A successful cloud migration may use all three approaches across separate systems.
Australian Data Sovereignty and Compliance Considerations
Data sovereignty should be considered early in cloud migration planning. It affects where data is stored, where backups are held, who can access systems, and what contractual or regulatory obligations may apply.
For Australian businesses, this is especially important when systems contain personal information, financial information, customer records, employee records, or sensitive business data.
What Data Sovereignty Planning Should Cover
A cloud migration plan should consider:
- Where primary data will be stored
- Where backups and replicas will be located
- Which cloud regions will be used
- Who can access data and administration tools
- How access will be logged and reviewed
- Whether third-party providers can access support data
- Whether industry-specific compliance requirements apply
- Whether customer contracts include data location requirements
As Cloud Computing environments become more central to daily operations, security planning should cover access, encryption, monitoring, backup, and recovery from the start.
The OAIC’s Australian Privacy Principles guidelines outline mandatory APP requirements and how the OAIC interprets them, including APP 8 for cross-border disclosure of personal information and APP 11 for security of personal information.
That does not mean every workload must remain in Australia. It does mean the business needs to understand where information will go, which parties may access it, and what controls are in place.
Why Security Planning Matters During Migration
Migration can also change the security model. Identity, access, backups, logging, and monitoring may all move into a different operating environment.
The OAIC’s Notifiable Data Breaches Report: July to December 2024 reported 595 notifications for that period, with malicious or criminal attacks listed as the largest source of notified breaches. That makes access control, monitoring, and response planning important parts of migration planning.
Cloud Regions and Data Boundary Controls
Cloud providers may offer Australian regions and data boundary controls, but the details matter. For example, Google Cloud’s Australia Data Boundary documentation explains controls for Australia-only regions, supported products, support access, and limitations.
That type of detail is important because data location settings alone may not answer every sovereignty question. Support access, product availability, logging, backups, and service limitations also need to be reviewed.
Cloud Migration Best Practices for a Smoother Move
Cloud migration best practices are most useful when they are applied before the cutover, not after problems appear.
Build a Clear Workload Inventory
Start with a current view of applications, servers, databases, storage, users, dependencies, and support requirements.
This should include:
- Business owner
- Technical owner
- Current hosting environment
- Data type
- Integrations
- Licensing
- Backup requirements
- Recovery requirements
- Known performance issues
Classify Data Before Moving It
Data classification helps the business decide which workloads need stronger controls.
At a minimum, identify systems containing:
- Personal information
- Sensitive information
- Financial records
- Health information
- Customer records
- Intellectual property
- Regulated or contractually controlled data
Build Security Controls Into the Plan
Cloud migration should include access control, MFA, logging, patching, backup, and administrative privilege review.
ASD’s Essential Eight guidance describes eight baseline mitigation strategies, including patching applications, patching operating systems, MFA, restricting administrative privileges, application control and restricting Microsoft Office macros.
For a deeper look at update processes, review Patch Management: Essential Practices to Keep Your Systems Secure and Updated.
Test Before Cutover
Testing should cover more than whether an application opens.
It should include:
- User access
- Data integrity
- Data migration validation
- Integration behaviour
- Application performance
- Backup and restore
- Security logging
- Failover behaviour
- User acceptance testing
A controlled test process supports a successful cloud migration and helps with ensuring a smooth transition before staff, customers, or partners rely on the migrated system.
Monitor Cost After Migration
Cloud cost should be reviewed after migration because consumption patterns can change once workloads are live.
Useful controls include:
- Budget alerts
- Resource tagging
- Scheduled reviews
- Rightsizing
- Reserved capacity where appropriate
- Review of unused resources
Cloud can be cost-effective, but it needs active management. Cost saving opportunities are easier to identify when usage is measured consistently and reviewed in real time where monitoring tools support it.
Planning Cloud Migration Support After Cutover
Cloud migration support should be planned before migration starts. Cutover is only one milestone. Once workloads are live, the business still needs monitoring, optimisation, security review, user support, and governance.
What Ongoing Support Should Include
Post-migration support should include:
- System monitoring
- Security updates
- Backup testing
- Access reviews
- Cost reviews
- Performance optimisation
- Incident response
- User support
- Documentation updates
- Governance reporting
If your internal team needs help maintaining performance, security, updates, and cost control after migration, Steadfast Solutions’ Managed Cloud Services can support the environment beyond cutover.
The ASD Information Security Manual is designed as a cyber security framework that organisations can apply through their own management framework to protect IT and operational technology systems from cyber threats: Information Security Manual.
When comparing cloud migration services Australia-wide, look for support that covers planning, workload assessment, migration sequencing, security controls, cost management, and post-migration optimisation.
For cloud environments, that reinforces the need to treat security and compliance as an ongoing management function.
Build a Cloud Migration Strategy That Fits the Business
A cloud migration strategy should help the business move with control, clarity, and a practical understanding of what each workload needs.
Rehost, replatform, and refactor each have a place. Rehost can support a faster move for stable systems. Replatform can improve selected workloads without a full redesign. Refactor can provide stronger long-term value for applications that need deeper modernisation.
For Australian businesses, the decision should also account for data sovereignty, privacy, security controls, support access, backup location, and ongoing management. These issues are easier to address during planning than after migration has already begun.
Steadfast Solutions can help businesses assess workloads, compare migration options, and plan Cloud Migration with the right mix of architecture, deployment, security, and ongoing support for migration to the cloud.
Frequently Asked Questions
What is cloud migration strategy?
A cloud migration strategy is a structured plan for moving applications, data, infrastructure, or services into a cloud environment. It should define which workloads will move, which migration approach will be used, what security controls are required, how data will be managed, and how the environment will be supported after migration.
How to choose the best migration approach?
The best migration approach depends on the workload and the business goal. Rehost may suit stable systems that need to move quickly. Replatform may suit workloads that need targeted improvement. Refactor may suit important applications that need deeper modernisation, scalability, or long-term development.
What are the key challenges in cloud migration?
Common challenges include unclear workload dependencies, legacy application limitations, downtime planning, data security, user access changes, cost management, integration testing, and post-migration support. These challenges are easier to manage when they are identified during planning.
How to ensure data sovereignty compliance in Australia?
Start by identifying what data each workload stores, where that data will be hosted, where backups will be kept, who can access the environment, and whether any industry or contractual obligations apply. Businesses should also review cloud region settings, support access, access controls, logging, and privacy obligations before moving to the cloud.