Cloud Migration Checklist for UK Businesses 2026

Cloud migration is one of the most impactful IT investments a UK business can make, but it's also one of the easiest to get wrong. Poorly planned migrations result in unexpected costs, security gaps, data loss, and staff frustration. This checklist guides you through every stage of a successful cloud move.

Before You Migrate: Planning & Discovery

1. Define Your Goals

Be specific about why you are migrating. Cost reduction? Remote working capability? Compliance? Disaster recovery? Your goals determine which cloud services and migration approach are right for you. Avoid migrating just because "everyone is doing it". The best cloud strategies start with a clear business case.

2. Audit Your Current Infrastructure

List every application, server, database, and file share your business uses. For each, record: the owner, number of users, data sensitivity (public, internal, confidential), dependencies on other systems, and whether a cloud alternative exists. This asset audit prevents nasty surprises mid-migration.

3. Classify Your Data

UK businesses must comply with GDPR when moving data to the cloud. Identify which data is personal data (names, emails, financial records, health information). Confirm your chosen cloud provider is GDPR-compliant and stores EU/UK data in appropriate regions. Microsoft Azure and Microsoft 365 both offer UK South and UK West data residency options.

4. Choose Your Cloud Model

Three main options for UK SMBs:

• Microsoft 365 - best for email, productivity, collaboration (Teams, SharePoint, OneDrive). Suitable for almost every business.
• Microsoft Azure - best for hosting servers, databases, and applications in the cloud. Replaces on-premise infrastructure.
• Amazon Web Services (AWS) - best for developers and businesses with complex application architectures or multi-cloud strategies.

Most UK SMBs start with Microsoft 365 and migrate servers to Azure. AWS is typically adopted by tech-forward businesses or those with existing developer capability.

Security Checklist

5. Enable Multi-Factor Authentication (MFA)

This is non-negotiable. Enable MFA for every user on every cloud service from day one. Microsoft 365 allows you to enforce MFA via Conditional Access policies. A single account without MFA is all a ransomware gang needs to compromise your entire organisation. Cyber Essentials certification, which Liquid ICT recommends for all clients, requires MFA for cloud accounts.

6. Apply the Principle of Least Privilege

Every user should have access only to the data and systems they need to do their job. In Microsoft 365 and Azure, use role-based access control (RBAC). Review admin accounts. Most staff should never have global admin rights. Audit permissions before migration and right-size them as part of the process.

7. Configure Conditional Access Policies

Use Azure AD Conditional Access (now Microsoft Entra ID) to define who can access what, from where, and on what devices. Block access from high-risk countries. Require compliant devices. Enforce MFA for all admin actions. These policies are free with Microsoft 365 Business Premium and are among the most effective security controls available.

8. Encrypt Data in Transit and at Rest

All major cloud providers encrypt data at rest by default. Confirm this is enabled and understand where your encryption keys are held. For highly sensitive data, consider Customer Managed Keys (CMK) where you control the encryption. For data in transit, ensure all connections use TLS 1.2 or higher. Disable older protocols.

Compliance Checklist

9. Review Data Processing Agreements (DPAs)

Under GDPR, if your cloud provider processes personal data on your behalf they are a data processor. You must have a Data Processing Agreement in place. Microsoft, Google, and AWS all provide standard DPAs as part of their enterprise terms. Check and retain a copy before you migrate any personal data.

10. Verify Data Residency

Post-Brexit, UK businesses need to confirm where their data is stored. Microsoft 365 allows you to specify UK data residency. In Azure, select UK South (London) or UK West (Cardiff) regions. Avoid migrating regulated data (financial, healthcare, legal) to non-UK regions without legal advice.

11. Update Your Privacy Policy and Data Register

Your GDPR records of processing activities (Article 30 register) must reflect new cloud processors. Update your privacy policy if new third-party processors are added. This is often overlooked but is a straightforward compliance requirement.

Migration Execution Checklist

12. Migrate in Phases, Not All at Once

A phased approach reduces risk significantly. A typical order for UK SMBs: (1) Email to Microsoft 365, (2) File storage to SharePoint/OneDrive, (3) Servers to Azure, (4) Line-of-business applications. Each phase should be tested before the next begins.

13. Test Before You Cut Over

Run parallel systems for at least one to two weeks before decommissioning on-premise infrastructure. Confirm all applications work correctly, emails route properly, and users can access everything they need. Have a rollback plan for each phase.

14. Train Your Staff

The most common cause of failed cloud migrations is not technical. It is adoption. Staff who do not understand Teams, SharePoint, or new authentication flows create helpdesk tickets, work around systems, and revert to old habits. Budget for training before go-live, not after.

15. Set Up Monitoring and Alerts

Once in the cloud, configure Microsoft 365 Defender alerts (or Azure Monitor) to notify you of suspicious activity: unusual sign-in locations, mass file downloads, failed MFA attempts. Cloud environments are internet-facing by definition, so monitoring is not optional.

Post-Migration Checklist

16. Decommission On-Premise Infrastructure Properly

Wiping and decommissioning old servers and workstations is a security and GDPR obligation. Hard drives must be securely erased (DoD 5220.22-M standard or physical destruction). Do not skip this step. Old hardware in a skip is a data breach waiting to happen.

17. Review Your Cloud Spend Monthly

Cloud costs are elastic and they can grow unexpectedly if not monitored. Set up Azure Cost Management or AWS Cost Explorer with budget alerts. Assign a named owner for cloud spend. Unused resources (old VMs, orphaned storage accounts) should be identified and deleted in a monthly FinOps review.

18. Test Your Backup and Disaster Recovery

Cloud does not mean your data is automatically backed up. Microsoft 365 does not guarantee long-term data recovery, so a third-party backup tool (such as Veeam Backup for Microsoft 365 or Azure Backup) is strongly recommended. Test restoration quarterly. Know your Recovery Time Objective (RTO) and Recovery Point Objective (RPO).

Need Help With Your Cloud Migration?

Liquid ICT has helped UK businesses of all sizes plan and execute cloud migrations, from simple Microsoft 365 moves to full Azure infrastructure transitions. Our cloud migration services handle the technical complexity so your team can focus on the business. Need ongoing management? Our managed IT services include proactive cloud monitoring, cybersecurity, and backup management.

Get in touch for a free cloud readiness assessment and migration scoping call.