Ready to move to the cloud? Choices and pitfalls
Moving a system to the cloud can happen in several ways, from a simple lift-and-shift to a full rebuild – each with different cost and benefit. The cloud doesn't always pay off; stable systems with steady load can become more expensive. The biggest shift is financial: from an investment to an ongoing cost that needs continuous monitoring to avoid spiraling.
Moving a system to the cloud is often presented as an obvious next step – cheaper, more flexible, more modern. Reality is more nuanced. A cloud move can be done in several ways with entirely different cost and benefit, it doesn’t pay off in every case, and it fundamentally changes the economics in a way that surprises those who haven’t planned for it. Here’s a decision guide for anyone considering moving an existing system, beyond the brochure promises.
The migration levels and their profile
There isn’t one way to move to the cloud, but a scale from the smallest possible change to a full rebuild. The further toward rebuild, the greater the benefit – but also the greater the cost and risk.
| Strategy | Cost and benefit |
|---|---|
| Lift-and-shift | Fast and cheap to carry out, but doesn't take advantage of the cloud's benefits |
| Lighter adaptation | Moderate effort, uses some cloud services without a total rewrite |
| Rebuild | Expensive and time-consuming, but lowest operating cost and greatest flexibility long-term |
Lift-and-shift is appealing because it’s simple: the system moves almost as-is. But precisely because of that, you rarely get the cloud’s benefits, and sometimes operations even become more expensive, since a system built for your own servers doesn’t use the cloud well. The rebuild is the opposite – the greatest effort, but a system that actually takes advantage of how the cloud works. The choice between them is driven by how much the system is worth and how long it will live: a system on its way out rarely justifies a rebuild, while one that will carry the business for ten years might.
When a cloud move doesn’t pay off
The cloud isn’t always the cheaper choice, and it’s important to say that plainly. The cloud’s economic strength is that cost follows usage – you pay for what you use. That pays off when load varies or grows, since you avoid paying for capacity you don’t use.
But for a stable system with even, predictable load, the logic flips. Then your own servers, already paid for and running at a known level, can be cheaper than renting equivalent capacity around the clock in the cloud. Anyone who moves such a system assuming the cloud is always cheaper can be unpleasantly surprised by the bill.
So calculate your own usage pattern before deciding. The question isn’t whether the cloud is cheap in general, but whether it’s cheap for your specific load.
Operating cost changes character
Perhaps the biggest shift in a cloud move isn’t technical but financial. On your own servers, cost is largely an investment – you buy the hardware and depreciate it over years. In the cloud, that same cost becomes an ongoing expense that varies with usage.
That gives flexibility but comes with new demands. Cloud costs have a well-known tendency to creep upward: a service here, a forgotten resource there, a traffic spike no one anticipated. Without active monitoring, the bill can grow quietly until someone reacts to an unexpected invoice. So budget not just for the move itself, but for ongoing cost control – someone who regularly reviews what the cloud actually costs and why.
A scenario: the right strategy for the right system
A company had two systems to move. One was being phased out within a couple of years; there, they chose a simple lift-and-shift, since a rebuild would never pay for itself in time. The other was business-critical and would live for a long time, and there they invested in a rebuild that let the system scale with demand.
They also set up a simple monthly review of cloud costs from day one. When a forgotten test environment started costing money, it was caught immediately instead of being discovered six months later. The point: there’s no universal cloud strategy – the right choice depends on each system’s value and lifespan, and the cost has to be tracked continuously.
Considering moving one or more systems to the cloud and want to choose the right strategy for each? At Weapp we’re happy to help with that assessment as part of our services – get in touch with a description of the systems and their future.
Frequently asked questions
What ways are there to move a system to the cloud?
The most common range from least to most extensive: lift-and-shift, where the system is moved almost unchanged; a lighter adaptation that uses some cloud services; and a rebuild, where the system is redesigned to take full advantage of the cloud. The further toward rebuild, the greater the benefit but also the greater the cost and risk. The choice depends on the system's value and lifespan.
Does the cloud always pay off?
No. The cloud's strength is that cost follows usage, which pays off with varying or growing load. A stable system with even, predictable load can conversely become more expensive in the cloud than on your own servers. Calculate your actual usage pattern instead of assuming the cloud is always cheaper – sometimes your own servers are still the economical choice.
What's the difference between lift-and-shift and a rebuild?
Lift-and-shift means the system moves to the cloud almost as-is – fast and cheap, but it doesn't take advantage of the cloud's benefits and can even become expensive to run. A rebuild means the system is redesigned to take advantage of what the cloud offers – more expensive and time-consuming, but it delivers lower operating costs and more flexibility long-term.
How does the cost change when we move to the cloud?
It changes character. On your own servers, cost is largely an upfront investment, while the cloud turns it into an ongoing expense that varies with usage. That gives flexibility but demands active monitoring – cloud costs tend to creep upward when no one is watching. Budget for continuous cost control, not just the move itself.