Cloud migration is the process of moving software applications and data from on-premise servers to cloud hosting platforms like AWS, Microsoft Azure, or Google Cloud Platform. For UK SMEs, the motivation is usually practical: the office server is old, the IT person who maintained it has left, hardware replacement is expensive, or staff need remote access. Cloud migration reduces hardware costs, improves reliability, enables remote access, and eliminates the burden of server maintenance.
We help UK SMEs migrate to the cloud without disruption. This guide explains the process, costs, and benefits so you can decide if and when to migrate.
What Are the Signs You Need Cloud Migration?
UK SMEs typically consider cloud migration when they hit one or more of these triggers:
- Aging hardware: The server is past its warranty, parts are hard to find, and replacement will cost thousands.
- No IT specialist: The person who maintained the server has left, and maintaining it is now a problem.
- Remote access needs: Staff work from home or multiple locations and need access to systems that live on the office server.
- Reliability issues: When the server goes down, the business stops. No backup, no failover, no redundancy.
- Scaling problems: The business is growing and the current hardware cannot keep up. Buying bigger hardware is expensive and inflexible.
- Security concerns: The server runs an outdated operating system that no longer receives security patches, creating a data protection risk. The ICO provides guidance on security obligations.
- Software compatibility: New software or updates require a modern operating system or infrastructure that the current server cannot provide.
If two or more of these apply, cloud migration is worth evaluating. The cost of staying on-premise often exceeds the cost of migrating within two to three years.
What Are the Benefits of Cloud Migration?
Cloud hosting offers several practical advantages over on-premise servers:
- No hardware to buy or replace: Cloud providers handle all infrastructure. You pay for what you use, not for hardware that sits idle half the time.
- Reliability: Cloud platforms have redundancy built in. If one server fails, another takes over. Most providers offer 99.9 percent or higher uptime guarantees.
- Remote access: Cloud-hosted applications are accessible from anywhere with an internet connection. No VPN to the office server required.
- Automatic backups: Cloud platforms provide automated backup and disaster recovery. If data is lost, it can be restored from snapshots.
- Scalability: Need more capacity during peak periods? Cloud resources scale up instantly and scale down when not needed. No buying hardware that sits idle.
- Security: Cloud providers invest heavily in security, with certifications and compliance that most SMEs cannot match on-premise. Data is encrypted, access is controlled, and security patches are automatic.
- Predictable costs: Monthly hosting fees replace unpredictable hardware replacement and maintenance costs.
How Does Cloud Migration Work?
The migration process has five phases:
- Assessment (1 to 2 weeks): Inventory all applications, databases, and data. Assess what can move directly (lift and shift), what needs modification, and what should be replaced. Determine cloud resource requirements and estimate ongoing hosting costs.
- Planning (1 week): Choose a cloud provider, design the target architecture, plan data migration order, and define a rollback plan in case of problems.
- Migration (1 to 8 weeks): Move applications and data to the cloud. This can be a direct lift (moving the application as-is to a cloud server), a re-platform (minor changes to suit cloud infrastructure), or a re-architect (significant changes to take advantage of cloud-native features).
- Testing (1 to 2 weeks): Validate that applications work correctly in the cloud. Test performance, security, and integration with other systems.
- Cutover (1 to 2 days): Switch from the old system to the cloud. This is typically done over a weekend to minimise disruption. Keep the old system available as backup for 30 days.
The total timeline ranges from one month for a simple single-application migration to four months for a full infrastructure migration.
What Does Cloud Migration Cost?
The cost has two components: the migration project and ongoing hosting.
Migration project cost:
- Simple lift and shift (one application, straightforward): 10,000 to 20,000
- Standard migration (multiple applications, some re-platforming): 20,000 to 35,000
- Complex migration (full infrastructure, re-architecting, data transformation): 35,000 to 60,000
Ongoing cloud hosting cost:
- Small workload (one or two applications, low traffic): 200 to 500 per month
- Medium workload (multiple applications, moderate traffic): 500 to 1,500 per month
- Large workload (many applications, high traffic, high availability): 1,500 to 5,000 per month
Compare this to on-premise costs: a server costs 3,000 to 8,000 to buy, plus electricity, plus maintenance, plus the risk of downtime. Over three years, cloud hosting at 500 per month (18,000 total) is typically cheaper than buying and maintaining a server (15,000 to 25,000 over three years, not counting downtime costs).
How Do You Choose a Cloud Provider?
The three major cloud providers, AWS, Microsoft Azure, and Google Cloud Platform, all offer similar core services. The choice depends on your specific needs:
- AWS: The largest provider, widest range of services, best for complex or specialised workloads. Slightly steeper learning curve.
- Microsoft Azure: Best if you already use Microsoft products (Office 365, Windows Server, .NET). Strong integration with existing Microsoft infrastructure.
- Google Cloud: Strong for data analytics, machine learning, and containerised workloads. Often competitive on pricing.
For most UK SMEs, the provider choice matters less than proper configuration. Any of the three will serve well if set up correctly. See our services for cloud migration support.
What Are the Risks and How Do You Manage Them?
The main risks of cloud migration and their mitigations:
- Data loss during migration: Always take a full backup before starting. Keep the backup until the cloud system is verified.
- Downtime during cutover: Plan the cutover for a low-traffic period (weekend). Keep the old system running in parallel until the new one is verified.
- Unexpected hosting costs: Set up cost alerts and monitoring from day one. Cloud costs can spiral if resources are not managed. Regularly review and right-size resources.
- Security misconfiguration: Cloud security is different from on-premise security. Use a partner who understands cloud security best practices, or use managed services from the cloud provider.
Ready to migrate to the cloud? Book a free discovery call to discuss your migration, or see our guide on legacy software modernisation if your systems need updating before migration.