Cloud migration planning is the work of deciding what should move, why it should move and how the business will operate during and after the transition. A sound plan covers application dependencies, access, data, cost, testing, support and the conditions for changing course.
The useful unit of planning is a business service. Moving a server is not enough if the people who depend on it can no longer complete a customer order, access a document or produce a required report.
Decide what the move is meant to achieve
Start with the constraint the business wants to address. It might need more dependable remote access, a replacement for ageing infrastructure, easier integration or capacity for a new application. Define the improvement in terms the service owner can assess.
Consider alternatives before treating migration as inevitable. A workload may be ready to move with limited change, need redesign, be better replaced by a managed application or remain where it is for now. Some systems may no longer be needed at all.
The AWS Cloud Adoption Framework examines cloud adoption through business, people, governance, platform, security and operations perspectives. It is a useful reminder that the technical move is only part of the change.
Map dependencies before scheduling a migration wave
For each business service, identify the applications, databases, file locations, identity services and external connections it relies on. Include scheduled jobs, reporting exports, email delivery and less visible dependencies such as printers or specialist devices.
Ask the people who operate the service to walk through a complete task. Documentation may describe the official workflow while an essential spreadsheet or manual export sits outside it. Discovering that dependency after cutover can turn a technically successful move into an operational problem.
Create a migration record with these fields:
- Service: the business activity and accountable owner.
- Dependencies: connected systems and required data flows.
- Availability: acceptable interruption and important operating periods.
- Information: data types, access requirements and approved locations.
- Acceptance: tasks that must work before the service is approved.
- Support: responsibility during the move and after handover.
Estimate the full operating arrangement
A useful cost estimate includes more than a virtual server. Consider storage, data movement, connectivity, software licences, backup, monitoring, administration and the resources required for testing or recovery. Include temporary overlap while old and new environments run together.
Use realistic usage assumptions and record their source. A workload that runs only during business hours differs from one that must remain available continuously. Growth estimates should be linked to business plans rather than selected to make one option appear more attractive.
Assign budget ownership before launch. Decide how unusual consumption will be detected, who investigates it and who is authorised to change the configuration. Migration can improve cost visibility, but moving to the cloud does not automatically reduce spending.
Design identity and security before copying data
Determine how employees, administrators and applications will authenticate, which permissions they need and how access changes are handled. Avoid moving broad legacy permissions unchanged simply because doing so is convenient.
Cloud responsibilities depend on the service selected. The AWS shared responsibility model, for example, distinguishes provider responsibilities from customer responsibilities that vary with the services used. Review the applicable provider documentation and state explicitly who manages each control in the proposed environment.
Record data location and access requirements from the organisation's policies and contracts. For a Canadian business, selecting a Canadian region alone does not answer every question about access, support or information handling. The assessment needs to consider the actual service arrangement.
Use a pilot that tests the difficult assumptions
Choose a bounded workload with representative dependencies and a recoverable failure path. A pilot should expose the uncertainties that matter, not only demonstrate that a simple application can run elsewhere.
Test a complete business transaction, relevant reports, permissions, expected load and monitoring. Check whether the support team can diagnose a problem using the information available to them. Record differences from the current environment and decide which need correction before the next wave.
Keep performance expectations specific. “Fast enough” is hard to verify. Ask the service owner which tasks need a defined response time and under what operating conditions.
Write a cutover and recovery plan people can follow
The cutover plan should identify the sequence of actions, the person responsible for each one and the evidence required to continue. Agree when changes to source data stop, how the final transfer is reconciled and who can authorise the move into normal use.
Define rollback conditions before the migration begins. Also determine whether rollback remains possible after new transactions have been accepted. Switching traffic back is not sufficient if the two systems now contain different business records; reconciliation may be required.
Maintain tested backups and establish a recovery route appropriate to the workload. Our business recovery planning guide explains why a backup must be connected to a workable restore process.
Accept the service before retiring the old environment
After migration, ask the business owner to confirm that the agreed tasks work and that significant exceptions have been resolved. Verify access, monitoring, support contacts, documentation and recurring jobs across a representative operating cycle.
Retire old resources through a controlled process once retention and recovery needs are understood. Leaving infrastructure running without ownership can create ongoing costs and an unclear security position. Closing it too early can remove a fallback the business still needs.
What should a cloud migration partner deliver?
Look for a defined scope, a dependency assessment, assumptions behind estimates, a tested migration sequence and a clear operating handover. Ask what the business must provide and which decisions remain with its owners. Delivery responsibilities should be specific enough to verify.
CREDIUM provides technology consulting, cloud and IT solutions, system integration and ongoing technical support within an agreed scope. We help businesses connect migration planning with the practical work required to keep services usable after the move.