Cloud computing for small businesses: what it is, what types there are and when it pays off to move to the cloud

Published on October 28, 2026 · The mitza.es team

Everyone talks about “the cloud”, but it's rarely explained what it is and, above all, whether it suits a small business with four computers, an invoicing program and a file server in a cupboard. The short answer: you probably already use the cloud without realizing it (your email, your storage or your accounting program), and the useful question isn't “cloud, yes or no?” but which part of your IT is worth moving there and which isn't. This guide gives you the definitions, the types, the advantages, the risks and a plan to decide.

What cloud computing is

Cloud computing means using computing resources (servers, storage, networks, databases or programs) that sit in a provider's data centers and that you reach over the internet, paying for what you use. Instead of buying a server, installing it and maintaining it in your office, you rent the capacity you need, when you need it.

An everyday example: if your team works with Microsoft 365 or Google Workspace, your email and your documents aren't on a computer in your office but on those companies' servers. That is already cloud computing.

How it works: the five characteristics of the cloud

The definition from NIST (the United States standards institute, which every provider takes as its reference) sums the cloud up in five characteristics:

• On-demand self-service: you sign up for and adjust resources yourself, without calling anyone.
• Broad network access: it can be used from any connected device.
• Resource pooling: the provider shares the same infrastructure among many customers.
• Rapid elasticity: you can scale capacity up or down in minutes, for example during a campaign.
• Measured service: you pay according to usage (users, space, compute hours…).

The three service models: IaaS, PaaS and SaaS

It's the most useful classification, because it determines how much work (and how much responsibility) is left to you.

IaaS: infrastructure as a service

You rent virtual “machines”, storage and network, and you install and manage the operating system and the programs. It's the closest thing to having your own server, but in somebody else's data center. Examples: Amazon EC2, Azure Virtual Machines, Google Compute Engine or OVHcloud. It offers a lot of flexibility and demands technical knowledge.

PaaS: platform as a service

The provider gives you the environment already prepared to run your applications (system, databases, scaling) and you only deploy your code. It's the usual choice when developing custom software, a website or an API without wanting to administer servers.

SaaS: software as a service

You use a ready-made program, from the browser, with a subscription: Microsoft 365, Google Workspace, your invoicing tool or your CRM. The provider takes care of everything technical; you take care of your data and your users. It's the easiest way to start and, for most small businesses, the one that gives the most value.

Public, private and hybrid cloud

• Public cloud: the infrastructure belongs to the provider and is shared by many customers (AWS, Azure, Google Cloud, OVHcloud…). It's the cheapest and most scalable option.
• Private cloud: infrastructure dedicated to your organization alone, on your premises or the provider's. It gives more control and costs more; it makes sense with regulatory requirements or very sensitive data.
• Hybrid cloud: you combine both, for example with your own server for what's critical and cloud services for the rest. It's very common among small businesses that don't migrate everything at once.

Advantages of cloud computing for a small business

• Less up-front investment. You don't buy or renew servers: you pay a monthly fee for what you use.
• It grows with you. Adding a user or more space takes minutes, not weeks.
• Work from anywhere. Remote work, sales reps on the road and several sites without setting up complicated networks.
• Updates and maintenance included in managed services (SaaS): the provider fixes bugs and vulnerabilities for you.
• Continuity. Big data centers have redundancy that a small business couldn't afford in its office (electricity, cooling, connectivity).

Risks and limits worth knowing

• Provider lock-in. If everything is on one platform, switching is costly. You should know from the start how you can export your data. In the European Union, the Data Act (Regulation 2023/2854) requires providers to make switching clouds easier and, from January 12, 2027, bans charging for switching, with limited exceptions (penalties for terminating early can remain).
• Variable costs. “Pay as you go” is an advantage until usage shoots up. Set spending alerts and review the bill every month.
• Internet connection. If the line goes down, access goes down. A second connection (for example, a 4G/5G backup) is cheap and avoids downtime.
• Data protection. If the provider processes personal data of your customers or employees, you need a data processing agreement and you need to know where the data is hosted. Prioritize data centers inside the European Economic Area.

Cloud or your own server: what a server is and when it still makes sense

A server is a computer (physical or virtual) that provides services to others: it stores files, runs a management program, hosts your website or handles email. A server in your office gives you control and speed inside the local network, but it also forces you to buy it, maintain it, update it, protect it and replace it when it gets old.

Having your own (or a NAS) still makes sense when you work with very large files (video, design, CAD), when your connection is unstable or when an old program doesn't exist in a web version. In other cases, cloud services or a hybrid model tend to win: what's critical and heavy stays on-premises, while email, documents and collaboration go in the cloud.

Cloud storage: what it's for and what it isn't

Cloud storage (Drive, OneDrive, Dropbox, SharePoint…) is for sharing files, working as a team and accessing them from anywhere. But syncing isn't the same as having a backup: if someone deletes a file or ransomware encrypts it, the change is replicated everywhere. You also need independent copies; we explain how to set them up in our guide to 3-2-1 backups.

Cloud security: it's your responsibility too

In the cloud, security is shared: the provider protects the infrastructure (the data centers, the servers, the network) and you protect what you put on it (accounts, permissions and data). The more “out of the box” the service is, the less is left to you: in SaaS the provider looks after the application; in IaaS you're responsible for the operating system, updates and configuration.

The measures that reduce risk the most, and the ones most often neglected:

• Two-step verification on every account, especially administrator accounts.
• Long, different passwords. You can generate them with our password generator and check them with the password checker.
• Minimum permissions: each person accesses only what they need, and access is removed when they leave the team.
• Independent backups and a regular check that they can be restored.

Cloud accounts are also the favorite target of phishing and ransomware: one stolen password opens everything behind it.

When it pays off to migrate to the cloud (and when it doesn't)

It usually pays off if you recognize yourself in several of these situations:

• Your server is more than five years old or about to start giving trouble.
• Some people work outside the office or across several sites.
• Backups depend on “someone remembering” to make them.
• You pay licences and maintenance for programs that exist as a subscription service.
• You expect to grow (more users, more shops, more campaigns) and don't want to invest in hardware up front.

There's no point forcing it if your business depends on old applications with no web version, if you handle huge files over a limited connection or if the monthly cost over three years is clearly higher than your current solution. In that case, a hybrid solution is usually the most reasonable.

How to migrate in seven steps

1. Inventory: which programs, files, emails and accesses you have, and who uses them.
2. Priorities: start with what brings the least risk and the most benefit (email and documents).
3. Choose a provider and a model (SaaS, IaaS…), reviewing the contract, where the data is located and how you can leave.
4. Prepare security: two-step verification, permissions and a password policy.
5. Migrate in phases and keep the old setup running in parallel until you've confirmed everything works.
6. Train the team: without training, people go back to their old habits.
7. Review costs and backups after one month and after three, and switch off what you no longer use.

Common mistakes when moving to the cloud

• Migrating everything at once, instead of in phases.
• Assuming the provider already makes your backups without checking.
• Not setting spending limits and getting a surprise at the end of the month.
• Leaving administrator accounts without two-step verification.
• Not documenting who has access to what and under which contracts.

How we can help at Mitza

We support small businesses and freelancers in their day-to-day IT: from choosing the right service to migrating email, files and backups with no interruptions. If you're in southern Madrid, you can see the IT maintenance service we offer, and if you'd rather set out your case, write to us and we'll review it with you.