What is the cloud?

Most people don’t really know what it is. To be honest, nobody really even knows why it’s called the cloud. You’re certainly not alone if you’ve wondered what it actually means, whether it has anything to do with weather, or if you’ll lose all your photos when it rains.

To be frank, the cloud is just someone else’s computer.

That’s it. When you save a file to Google Drive, or pull up a spreadsheet in Microsoft 365, or stream a song on Spotify, your data isn’t floating about in some weightless digital ether. It’s sitting on a physical server, in a physical building, somewhere on earth. Those buildings are called data centres, and they are enormous. Amazon, Microsoft, Google, and a handful of others own and operate thousands of them across the world. They are warehouses filled floor to ceiling with computers, with industrial cooling, running 24/7.

The “cloud” is just your data on their hardware, accessed over the internet. The word exists because “someone else’s server farm in Slough” didn’t sound quite as sexy.

So why does anyone use it?

The honest answer is that for a lot of businesses, it genuinely makes life easier.
The most obvious advantage is accessibility. Your files exist wherever you have an internet connection. You can start something on your office desktop on a Tuesday morning and pick it up on Friday afternoon sat in your pyjamas pretending to work from home! For teams spread across multiple locations, or businesses that have people working from home, that’s just really handy.

There’s also the question of upfront cost. Buying and maintaining your own physical servers requires a hefty upfront payment, and crucially physical space. Cloud storage basically removes that barrier. You pay a monthly fee, you get your storage, and someone else handles the hardware. For a small business especially, it really helps keep the cupboards empty and the accountant happy!

Scalability is also a factor. If your business grows, you buy more storage. If a project ends and you need less, you scale back. You’re not locked into hardware you’ve already bought and can’t easily get rid of.

Automatic backups are another real benefit. Whether it’s a flooded office, a stolen laptop or Pat pressing delete on everyone’s favourite spreadsheet. Data backed up to the cloud is data you don’t lose.

For a lot of businesses, particularly smaller ones, it just works and they can ignore it.
Which let’s be honest is what most people want from anything IT related!

Not all sunshine and server farms

Let’s start with the environment. Data centres consume extraordinary amounts of
energy. They run constantly, they require industrial cooling, and they are growing fast.
You’ll have probably read about data centres relating to AI, which will inevitably
increase this demand exponentially. Let’s ignore AI for a moment and just c onsider one
tiny corner of i t, the emails sitting in UK inboxes right now. Everyone does it, we all
have hundreds if not thousands of emails sat in our inboxes we’ve never deleted. But
most of us won ’t think about the fact that every single one of those emails is sat in a
server somewhere, being stored and backed up 24/7. Research suggests that
collectively, the energy needed to store all of our emails could power your house for
over a thousand years . And that’s just UK work emails, one tiny corner of what the
cloud actually stores .

Then there’s reliability. The cloud is sold, implicitly, as something that just works. And
most of the time it does. But when it doesn’t, the scale of the problem becomes very
clear very quickly.

One of the founding principles of the internet was resilience , it was designed to have
no central point of failure . Thanks to the monopolies now held by the likes of Amazon
a significant proportion of the world’s data access can be stopped by a handful of
errors.

In late 2025, major outages at AWS, Azure and Cloudflare took down services across
the world. The Scottish Parliament couldn’t access its own systems. Barclays customers
couldn’t reach their accounts. Businesses that had moved everything online found
themselves with nothing to do but wait. They couldn’t even go on social media to
express their outrage as that was also down .

And it ’s worth remembering that these data centres are still physical buildings in
physical locations. If a conflict were to break out in the vicinity of a data centre, you
might find that suddenly all those cat pictures you saved to the cloud have been
eviscerated in the search for petrochemicals.

Someone else’s computer. Someone else’s disaster. Your problem.

The practical questions

For most businesses , when weighing up cloud infrastructure, the two main points are
security and cost.

On cost, the numbers are often presented in a way that feels manageable. A few
hundred pounds a month doesn’t sound like a major decision. But a few hundred
pounds a month is several thousand pounds a year, and over five years it starts to look
very differ ent compared to buying your own hardware outright. The upfront cost of
physical servers looks intimidating where a subscription never does . It’s the sam e
psychology as a car lease , you drive away feeling like you got a good deal, and a
few years later you’ve paid more than the thing was worth and don’t own anything.

It’s also worth knowing who you’re making rich when you sign up. Over half of
Amazon’s total profit comes not from anything they sell online, but from AWS their
cloud division. The monthly bill that feels modest to you is, multiplied across millions of
businesses, an extraordinarily profitable operation. That’s not a reason to avoid it. But
it is useful context for understanding how aggressively it gets sold .

Security is where things get more nuanced. The cloud is often assumed to be safer
because it’s newer, and because it’s run by companies with enormous security
budgets. And in many cases, that’s true. But it’s also a fundamentally different model.
Your data is accessible over the internet, sitting on infrastructure you don’t own,
managed by people you’ll never meet.

A physical server flips that entirely. It requires physical access . It’s a lot harder for an
international data thief to break into your office in Nuneaton than it is for them to steal
your data over the internet ! But this is a very different kind of risk. It’s visible , it’s local,
and it’s under your control – for better or worse. Because control also means
responsibility . If it’s not patched, not monitored, or not backed up properly, that’s on
you or your IT provider .

Useful Not Magic

In reality, neither approach is universally better. One prioritises convenience, the other
control.

This is why most businesses don’t make a clean choice between the two. Critical
systems and sensitive data often stay on premises , where access is tightly controlled
and not dependent on a third party doing everything right at the exact moment you
need it. The cloud gets used where it earns its keep with backups, collaboration, and
anything that actually benefits from being accessible anywhere.

For smaller businesses, or those without proper IT provision , going fully cloud often
makes the most sense ; primarily because it’s just easier and small business owners
already have a lot to think about without having to worry about patching a server . As
things grow, that’s usually where a hybrid setup starts to make most sense, especially if
you have someone else to look after all the boring server stuff for you .

As with anything li ke this, it ’s worth sitting down with your IT provider and figuring out
what’s right for you. The major providers do build in geographic backups so your data
is rarely as exposed as the worst case suggests , but as 2025 showed, no system is
infallible .

There’s no right or wrong answer, it’s just crucial to remember that the cloud is not a
definitive upgrade over traditional setups, even if it is marketed as such.
The cloud is incredibly useful. But it isn’t magic.
It’s just someone else’s computer .