Why Migrate?
Moving to the cloud isn't about following a trend. It's about solving specific business problems: reducing infrastructure costs, improving reliability, enabling remote work, scaling capacity on demand, and eliminating the burden of managing physical servers.
But cloud migration isn't free, and it isn't simple. Done well, it transforms your operations. Done badly, it creates new problems while failing to solve the old ones.
The Migration Strategies
There are six common approaches to cloud migration. Most real-world projects use a combination.
Rehost ("Lift and Shift")
Move your applications to the cloud with minimal changes. The fastest approach and the lowest risk, but you don't get the full benefits of cloud-native architecture. Good for quick wins and reducing hardware costs.
Replatform ("Lift and Optimise")
Move to the cloud with some optimisation — for example, switching from a self-managed database to a managed cloud database service. More benefit than rehosting, moderate effort.
Refactor
Rearchitect your applications to take full advantage of cloud-native features — containers, serverless functions, managed services. The most effort, but the most long-term benefit. Only worthwhile for applications that justify the investment.
Repurchase
Replace an existing application with a cloud-based SaaS alternative. Sometimes the smartest move is to stop maintaining something and buy a better version.
Retain
Keep some systems where they are. Not everything needs to move to the cloud. Legacy systems that work, aren't growing, and would be expensive to migrate are often best left alone.
Retire
Turn off applications that are no longer needed. Migration is a good opportunity to audit what you're running and eliminate dead weight.
How to Plan Your Migration
Step 1: Inventory
List every application, database, and service you're running. For each one, document what it does, who uses it, what it depends on, how critical it is, and how much it costs to run.
Step 2: Assess
For each application, determine the right migration strategy. Consider the business value, technical complexity, dependencies, and risk tolerance.
Step 3: Prioritise
Start with low-risk, high-value migrations. Quick wins build confidence and demonstrate value. Save complex, critical systems for later when the team has experience.
Step 4: Design the Target Architecture
Define what your cloud environment will look like. Choose your cloud provider (AWS, Azure, GCP, or Cloudflare), design the network architecture, define security boundaries, and plan for monitoring and disaster recovery.
Step 5: Migrate in Waves
Don't try to migrate everything at once. Group applications into waves based on priority and dependencies. Each wave should be planned, executed, tested, and stabilised before starting the next.
Step 6: Optimise
Migration isn't the end. Once in the cloud, continuously optimise for cost, performance, and reliability. Cloud costs can spiral without active management.
Cost Considerations
What Gets Cheaper
Server hardware and maintenance, power and cooling, physical security, capacity planning (scale up and down as needed), and disaster recovery (cloud providers handle redundancy).
What Might Get More Expensive
Compute costs at scale (cloud isn't always cheaper for steady, predictable workloads), data transfer (egress charges can surprise you), storage for large data volumes, and the migration project itself.
Right-Sizing
The biggest cost mistake in cloud migration is provisioning resources based on peak capacity rather than actual usage. Cloud's greatest advantage is elasticity — use auto-scaling and right-size your instances based on actual demand.
Security in the Cloud
Cloud doesn't mean less secure — it means differently secure. The cloud provider handles physical security, network infrastructure, and base-level compliance. You're responsible for configuring access controls correctly, encrypting your data, managing secrets and credentials, keeping your applications patched, and monitoring for threats.
This shared responsibility model requires understanding what you're responsible for and what the provider covers. Most cloud security incidents are caused by misconfiguration, not provider failures.
Common Mistakes
- Migrating without a strategy. "Let's just move everything to AWS" is not a strategy. Each application needs its own assessment.
- Ignoring costs. Monitor cloud spending from day one. Set budgets and alerts. Cloud costs are variable and can escalate quickly.
- Treating cloud like a data centre. Don't just replicate your on-premise architecture in the cloud. Take advantage of managed services, auto-scaling, and cloud-native patterns.
- Skipping the networking design. Poor network architecture leads to performance issues, security gaps, and unnecessarily complex connectivity.
- No rollback plan. Each migration should be reversible. If something goes wrong, you need to be able to fall back to the previous state.
Right Advance Digital helps SMEs plan and execute cloud migrations that reduce costs, improve reliability, and set the foundation for growth. Get in touch.