Moving to the cloud sounds straightforward until you actually start doing it. Whether you are shifting from an on-premises server to Microsoft 365, migrating to Azure or AWS, or moving a specific application to a hosted platform, the process has more pitfalls than most businesses expect.
Here are five mistakes we see regularly, what happens when people make them, and how to avoid each one.
Mistake 1: Moving Everything at Once
The temptation is to rip the plaster off and migrate everything in one go. A full weekend cutover where you switch from the old system to the new one and hope for the best on Monday morning. It feels efficient, and the idea of running two systems in parallel is not appealing.
Here is what actually happens. Something does not work as expected. Maybe email routing goes wrong, a shared drive does not sync properly, or a line-of-business application turns out to be incompatible with the new setup. Now your entire company is affected, your IT team or provider is firefighting on multiple fronts, and your staff cannot do their jobs.
The fix is simple: phase your migration. Start with something low-risk, like email. Get that working properly, let people settle into it, then move on to file storage. After that, tackle more complex things like line-of-business applications or databases. Each phase gives you a chance to learn, fix problems and build confidence.
A phased approach takes longer, but it dramatically reduces the risk of a catastrophic failure that takes your whole business offline.
Mistake 2: Not Auditing What You Actually Have
You cannot migrate what you do not know about. It sounds obvious, but a surprising number of businesses start a cloud migration without a complete picture of their existing setup.
The result is that you get halfway through the migration and discover a critical database running on an old server under someone's desk. Or you find out that a department has been using a shared drive that nobody in IT knew about. Or you realise that an application you assumed was cloud-ready actually needs a Windows Server 2012 environment to run.
Before you start any migration, do a proper audit. Document every server, every application, every shared resource and every integration between systems. Talk to department heads and ask what tools and systems their teams rely on daily. Check what data exists, where it lives and who owns it.
This audit will also help you decide what should move to the cloud and what should not. Not everything needs to be migrated. Some old data can be archived. Some applications might be better replaced than migrated. You need a clear picture before you can make those decisions.
Mistake 3: Ignoring Bandwidth and Connectivity
When your files and applications lived on a local server, your network speed did not matter much for day-to-day work. Everything was fast because it was all in the same building. Move those same files and applications to the cloud, and suddenly every interaction depends on your internet connection.
This catches people out more than you would expect. A business with a 30Mbps broadband connection and 40 users will struggle when everyone is trying to access cloud files, use Teams video calls and run cloud applications simultaneously. Things get slow, calls drop, files take ages to open and people start complaining.
This is especially relevant for rural offices or businesses in areas with limited broadband options. If your internet connection is unreliable, moving critical systems to the cloud means your ability to work depends entirely on that connection.
Before migrating, assess your bandwidth requirements. Consider upgrading your internet connection. Look at options like leased lines for guaranteed bandwidth. If you have multiple sites, think about each one individually. Your head office might have great broadband while a branch office is stuck on a slow connection. Plan for redundancy too. If your primary connection goes down, having a 4G or 5G backup can keep you working.
Mistake 4: Forgetting About Licensing Costs
Cloud services are typically billed monthly per user or based on usage. This is often presented as a benefit because you avoid large upfront costs. What catches people off guard is how quickly those monthly costs add up, and how easy it is to end up paying for more than you need.
Microsoft 365 is a common example. Business Basic is around £5 per user per month. Business Premium is around £19 per user per month. The difference sounds small, but for 50 users, that is the difference between £3,000 and £11,400 per year. Do all 50 users actually need the premium features? Probably not, but it is easy to just put everyone on the same plan without thinking about it.
Azure and AWS can be even more surprising. Cloud infrastructure costs are based on compute time, storage, data transfer and dozens of other variables. Without careful planning and monitoring, you can end up with bills that are significantly higher than running your own servers. We have seen businesses shocked by their first Azure bill because they left virtual machines running 24/7 when they only needed them during office hours.
The solution is to plan your licensing carefully before you migrate. Match licence tiers to actual user needs. Set up cost alerts and budgets in Azure or AWS so you know immediately if spending spikes. Review your cloud bills monthly and adjust resources as needed. Do not just set it up and forget about it.
Mistake 5: No Rollback Plan
Every migration plan should answer one question: what do we do if this goes wrong? If the answer is 'we will figure it out at the time', that is not a plan.
When a migration fails or causes serious problems, you need the ability to go back to the way things were while you sort it out. That means keeping your old systems running in parallel for a defined period. It means having tested backups of everything. It means knowing exactly what steps are needed to reverse the migration for each phase.
Without a rollback plan, a failed migration becomes a crisis. Your old server has been decommissioned, your data is in a half-migrated state, and nobody knows how to put things back. Your staff cannot work, and your IT provider is trying to fix a mess that did not need to happen.
For each phase of your migration, define what success looks like, what failure looks like and at what point you pull the trigger on rolling back. Keep the old systems available for at least two to four weeks after each phase completes. Do not decommission anything until you are confident the new system is working properly and your data is intact.
Getting It Right
Cloud migration does not need to be painful. The businesses that have smooth transitions are the ones that plan properly, take it in stages and are realistic about their timelines and budgets.
Start with the audit. Understand what you have and what needs to move. Check your internet connection can handle the additional load. Work out the real costs including licensing, bandwidth upgrades and any professional services. Phase the migration so you can manage risk. And always have a way to go back if things do not work as expected.
If you are working with an IT provider, they should be guiding you through all of this. If they are not talking about phasing, rollback plans and bandwidth assessments, ask why. A provider who just wants to move everything over a weekend and be done with it is cutting corners that could cost you dearly.