A business guide to moving legacy applications to the cloud

Older business applications often struggle to keep up with modern security, performance, and scalability requirements. Migrating these legacy systems to the cloud can unlock greater flexibility and efficiency, but the process requires thoughtful planning. So, how can organizations approach this transition effectively?

Evaluate your existing applications

Begin by creating a detailed inventory of your applications, including their versions, dependencies, and how they interact with other systems. Doing so helps you determine which applications are good candidates for cloud migration and which ones may require additional work before they can be moved. Some older software may rely on outdated frameworks or hardware that won’t translate easily to a cloud environment.

Involving developers and IT specialists early on can also help reveal potential challenges. They can analyze an application’s code and architecture to determine if it can run in the cloud as is or if it will need to be modified.

Select the right migration approach

Not every legacy application needs the same migration strategy. In most cases, businesses choose one of three common approaches:

Rehosting, commonly known as the lift-and-shift method, involves migrating an application to the cloud with few or no modifications. While this approach is typically the quickest migration strategy, it may not fully leverage native cloud capabilities like auto-scaling and optimized resource management.
Refactoring or application evolution involves modifying parts of the application to better suit a cloud environment. This may include updating code, replacing certain components, or improving how the application handles resources. It’s a good option for applications that will continue to be used long term.
Rebuilding or modernization involves completely reconstructing the application using modern, cloud-native technologies. Although it demands more time and resources, rebuilding often yields the most significant long-term advantages in performance and scalability.

The right choice will depend on your organization’s goals, budget, timeline, and the importance of the application itself.

Build a migration timeline

Cloud migrations should be carefully scheduled to minimize disruptions to business operations. A detailed timeline allows teams to prepare for each phase of the process. Factors such as application dependencies, system complexity, peak usage times, and testing requirements should all be considered when creating the schedule.

While smaller systems can be moved quickly, larger or mission-critical applications may take months to migrate safely. A well-planned schedule enables a smooth transition and reduces the risk of unexpected downtime or operational problems.

Create a clear data migration plan

For most organizations, the data connected to an application is just as important as the application itself. Losing or corrupting data during migration can cause serious problems.

Start by identifying all data sources tied to the application and understanding how the data is stored and structured. From there, decide whether to move everything at once through a bulk transfer or migrate data gradually in stages.

Backups are essential before beginning any migration work. Once the data has been moved to the cloud environment, thorough testing should confirm that everything remains accurate and intact.

Migrate and monitor carefully

With planning complete, the migration process can begin. Depending on the chosen strategy, this may involve updating code, transferring application components, or deploying new cloud infrastructure.

As each component is moved, it’s important to test functionality and monitor system behavior closely. To minimize risk, many organizations opt for a phased migration, transferring applications in stages so they can address issues as they arise, allowing for a smoother transition.

Test and optimize after migration

Once the migration is complete, the final phase begins. Post-migration testing is crucial to confirm that all applications are performing as expected in the new cloud environment. It involves a comprehensive review of performance metrics, validation of data integrity, and a thorough check of security configurations to confirm everything is locked down. It’s also vital to verify that users can access the system seamlessly.

Based on these tests, you may need to make adjustments to optimize performance or fully leverage cloud-native features. To achieve a smooth transition and encourage user adoption, provide employees with training sessions or detailed walkthroughs of the updated system.

Partnering with experts can simplify the process

Migrating legacy applications to the cloud can be complex, especially for organizations with limited internal IT resources. Working with experienced cloud professionals can make the process more manageable. From evaluating existing systems to managing the migration and optimizing the final environment, our IT experts can help guarantee a smooth transition so your business can focus on growth instead of infrastructure challenges. Get in touch with us to get started.