You’ve done the planning. You’ve approved the budget. You’ve got the cloud migration services firm onboarded. You’re two months into the project.
Then your team discovers something: The migration plan doesn’t account for the legacy middleware your trading system runs on. The cloud migration services firm you hired has never migrated that specific platform. Your timeline just doubled.
Or worse, you’re post-migration. Everything went fine. But your cloud bill is triple what you expected because nobody configured the resource limits. Your “cost-saving” migration just became a cost explosion.
These aren’t theoretical. They’re the most common mistakes we see. And they’re preventable.
Mistake 1: Underestimating the Application Inventory
This is where most cloud migration services projects struggle.
Most companies think they know what they run. Then the migration actually starts.
You ask for the list of applications. You get a spreadsheet with 60 applications. Okay, that’s manageable. Then you start digging.
“Wait, what’s this Excel sheet that runs the accounts payable process?”
Someone created it in 2008. It’s been running continuously since then. It’s not on any inventory list because it’s on someone’s laptop that connects to a shared drive. It has no documentation. It has no backup. But it runs your finance process.
That Excel sheet now has to be part of the migration. It’s not in the plan. It’s not in the budget.
Multiply that by 20 or 30 hidden applications and you’ve got a real problem.
How to avoid it: The assessment phase of cloud migration services needs to be thorough. Have people walk through their processes. What systems do they touch? What tools? What databases? What legacy stuff is running on someone’s machine?
The cost: Discovering hidden applications mid-migration typically adds 2-3 months to the timeline and $100,000 to the budget.
Mistake 2: Not Understanding Licensing
Your current software licenses work on-premises. Cloud migration services changes the equation.
Some software licenses don’t transfer to cloud. Some require different licensing models. Some are cheaper in cloud. Some are more expensive.
A company moved their Oracle database to cloud without thinking about licensing. Oracle found out and sent them a bill for $400,000 in back-licensing fees.
That’s not legal territory cloud migration services firms can navigate. You need to work with your software vendors.
How to avoid it: Before cloud migration services starts, go through your critical applications and understand the licensing. Some vendors have cloud-specific licensing programs. Some offer discounts for cloud. Work it out in advance.
The cost: Licensing surprises can wipe out your cloud migration services savings. One company’s $500,000 savings became a $200,000 net savings after they discovered their enterprise licensing didn’t cover cloud.
Mistake 3: Forgetting About Dependencies
Your applications don’t live in isolation. They talk to each other.
Application A calls Application B which uses Database C which is synced with system D which sends reports to system E.
When you migrate Application A to cloud, everything else is still on-premises. Now you have a hybrid mess. Data flowing back and forth between cloud and on-premises. Network latency. Security complexity.
Some cloud migration services firms migrate applications in isolation. Then they realize the dependencies. Everything has to move together.
A financial services company moved their web application to cloud. But it depended on a mainframe system that handled settlements. The mainframe couldn’t move (yet). Now they had hybrid infrastructure with complex integration. Cost went up. Complexity went way up.
How to avoid it: Map your application dependencies before migration. Use something like ServiceNow or Apptio to understand the dependency graph. Plan your migration in batches of dependent systems, not random applications.
The cost: Working around dependencies usually adds several months and tens of thousands to the project.
Mistake 4: Skipping Performance Testing
On-premises, your application runs the way it runs. You know what speed feels like.
Move to cloud and architecture changes. Database calls that were local are now over the network. Caching strategies that worked don’t work anymore. Scaling happens differently.
You might be faster. You might be slower. You don’t know until you test.
A company moved their application to cloud migration services and discovered it was 30% slower. Some queries that took 200ms now took 400ms. It cascaded. Users complained. They had to redesign the application to be cloud-friendly.
That redesign took three months. It cost $250,000. It could have been planned as part of the migration.
How to avoid it: During cloud migration services, run load tests. Simulate your peak traffic. Measure response times. Identify bottlenecks before they become production problems.
The cost: Fixing performance issues post-migration is expensive. Either you do the work upfront during migration (included in the budget) or you do it later (emergency project at 3x the cost).
Mistake 5: Ignoring Data Migration Complexity
Moving data to cloud isn’t as simple as copying files.
How much data? Terabytes. Petabytes. Network bandwidth is limited. Upload time compounds.
What if the data structure is different? What if the cloud database requires migration? What if you have duplicate data you don’t know about?
A healthcare organization moved 400 terabytes of imaging data to cloud. They assumed 30 days based on bandwidth calculations. Reality was 80 days because the network was congested. They missed their go-live date.
Another company discovered during migration that they had the same data in three different places. They were migrating the duplicates. Suddenly their cloud bill is three times what it should be.
How to avoid it: Before cloud migration services, audit your data. How much is there? Is any of it duplicate? What’s the data structure? Plan the transfer accordingly. Use cloud provider tools like AWS DataSync or Azure Data Box for large transfers.
The cost: Data migration delays add weeks to the project. Large data migrations often cost $50,000 to $500,000 depending on volume.
Mistake 6: Not Planning for Cost Governance
Cloud is cheap until it isn’t.
You can spin up a server in seconds. You can provision storage instantly. You can run code without worrying about infrastructure. And you can rack up a bill without realizing it.
A startup moved to cloud migration services. Great. They started spinning up development environments. Lots of them. Thousands of compute resources running. The bill came in: $400,000 per month. They expected $40,000.
Turned out they were running hundreds of test instances that nobody was using. Just sitting there burning money.
How to avoid it: Cloud migration services includes setting up cost governance. Budgets. Alerts. Usage limits. Automated shutdown of unused resources. This has to be part of the migration plan.
The cost: Runaway cloud costs can wipe out your entire savings. Without governance, you might spend twice what you expected.
Mistake 7: Lifting and Shifting Without Optimization
This is subtle. The migration works technically. But you’re running cloud inefficiently.
A company moved their 10-year-old monolithic application to the cloud exactly as it was. It runs. It works. But they’re paying for infrastructure like it’s still 2015. They’re not using managed databases. They’re not using auto-scaling. They’re not using serverless. They’re not optimizing.
Their cloud migration services saved them 30%. They could have saved 70% if they’d optimized during migration.
How to avoid it: Cloud migration services should include optimization decisions. Use managed services. Redesign applications to be cloud-native where it matters. Use auto-scaling. You don’t have to refactor everything. But you should optimize the expensive parts.
The cost: Missing optimization means missing 40-50% of the potential savings.
Mistake 8: Inadequate Testing
Moving systems to cloud is fine. Making sure they work is different.
You need to test functionality. Test performance. Test security. Test disaster recovery. Test failover. Test scaling. Test compliance.
Most companies do some testing. Few do comprehensive testing.
A company tested their web application. It worked. They went live. The integration with their payment processor didn’t work because of some configuration issue they didn’t discover during testing. Revenue interrupted for 6 hours.
How to avoid it: Build a testing phase into cloud migration services. The testing should be as rigorous as your original implementation. Test functionality. Test integrations. Test security. Test compliance.
The cost: Discovering issues post-migration is expensive to fix. Testing during migration costs less and prevents bigger problems.
Mistake 9: Not Training Your Team
Your team managed on-premises infrastructure. Cloud is different.
They don’t know the cloud provider’s management console. They don’t understand cloud cost optimization. They don’t know how to troubleshoot cloud-specific issues.
A company moved to cloud and their ops team couldn’t figure out how to configure the auto-scaling. They’d spent a decade configuring physical servers. Cloud infrastructure-as-code was completely foreign.
They had to hire a consultant to help with basic cloud operations. That cost $50,000.
How to avoid it: Cloud migration services includes team training. Your ops team should understand the cloud platform. How to scale. How to monitor. How to troubleshoot. This can’t be skipped.
The cost: Teams that don’t understand cloud waste 20-30% of potential efficiency gains.
Mistake 10: Choosing the Wrong Cloud Migration Services Partner
This is the most important one.
A bad cloud migration services partner will cause problems that cost you hundreds of thousands.
Bad partners skip assessment. They say “trust us, it’ll work” and start moving systems. Bad partners have never migrated your type of application. They’re learning on your dime. Bad partners don’t plan for dependencies. They don’t think about cost. They don’t plan for training.
A company hired a cheap cloud migration services firm to save money. The firm cut corners. Architecture was poor. Testing was minimal. Post-migration, the company discovered critical issues. They spent $300,000 fixing problems that should have been designed correctly.
They would have saved money hiring an expensive firm that did it right.
How to avoid it: Cloud migration services partners should have experience with your type of applications. They should have case studies. They should have references. They should do thorough assessment. They should explain tradeoffs. They should plan for everything we’ve talked about.
The cost: A bad partner can cost you millions. A good partner costs more but saves you multiples of that.
Recovery From Mistakes
If you’re already in the middle of a migration and discovering problems, don’t panic.
Most of these are recoverable. It costs more. It takes longer. But you can fix it.
The key is discovering problems early. Better to discover hidden applications in month 1 than month 6. Better to discover performance issues during testing than post-launch.
That’s why good cloud migration services partnerships matter. They catch these things.
Frequently Asked Questions
We’ve already made some of these mistakes. Is it too late?
No. You can recover. It’s more expensive and takes longer. But you can fix most of these. Have your cloud migration services partner audit what’s happened so far. Identify the issues. Build a plan to address them. It’s not ideal but it’s not a disaster.
Which of these mistakes is most expensive to fix?
Probably hidden applications or poor architecture decisions. Discovering hidden applications mid-migration adds months. Poor architecture decisions (not using managed services, not optimizing) mean you’re not getting your savings. Those compound over time.
Can we avoid all of these mistakes?
You can avoid most of them with good planning and the right partner. A small percentage of issues are unavoidable. Some things only show up at scale. But the big problems are preventable.
How do we know our cloud migration services partner is good at avoiding these mistakes?
Ask about their process. Do they do thorough assessment? Do they map dependencies? Do they plan for licensing? Do they do performance testing? Do they do cost governance? Ask for references from companies similar to yours. Ask what went wrong on previous projects. Good partners will answer honestly.
What if we can’t afford the right partner?
You can’t afford not to. A bad migration costs more than the expensive partner. If budget is tight, use an expensive partner but scale back the scope. Migrate fewer systems. Do it in phases. Don’t try to do everything at once with a cheap partner.
