Cloud Computing Models: Which One Is Right for Your Business?

Cloud computing has changed the way businesses purchase, manage and use technology.

Instead of relying entirely on physical servers and software installed within the office, businesses can now access computing resources, applications, storage and infrastructure over the internet.

However, “moving to the cloud” can mean several different things. There are various cloud computing models, each offering a different balance of flexibility, control, security and cost.

Understanding these models can help your business choose the right technology setup rather than simply moving systems to the cloud without a clear strategy.

What Is Cloud Computing?

Cloud computing is the delivery of IT services over the internet.

These services can include:

• Data storage
• Servers
• Networking
• Business applications
• Cybersecurity tools
• Backup and disaster recovery
• Databases
• Virtual desktops
• Development platforms

Instead of purchasing and maintaining all the required hardware yourself, your business can access these resources through a cloud provider.

In many cases, cloud services are charged through a subscription or usage-based pricing model, allowing businesses to scale their technology as their requirements change.

The Three Main Cloud Service Models

Cloud computing services are commonly divided into three main categories:

• Infrastructure as a Service
• Platform as a Service
• Software as a Service

Each model gives the customer a different level of control and responsibility.

Infrastructure as a Service

Infrastructure as a Service, usually shortened to IaaS, provides businesses with access to virtualised computing infrastructure.

This can include:

• Virtual servers
• Storage
• Networking
• Firewalls
• Load balancers
• Backup services
• Virtual machines

Rather than purchasing physical servers and installing them within your premises, you rent the computing infrastructure from a cloud provider.

Microsoft Azure, Amazon Web Services and Google Cloud are well-known examples of platforms offering IaaS services.

What Does the Provider Manage?

The cloud provider normally manages the physical data centre, networking equipment, storage hardware and virtualisation platform.

Your business, or its IT provider, remains responsible for managing areas such as:

• Operating systems
• Applications
• User access
• Security configuration
• Software updates
• Data protection

When Is IaaS Suitable?

IaaS can be a strong option for organisations that need flexibility and control without purchasing physical infrastructure.

It may be suitable when:

• Replacing ageing servers
• Hosting business applications
• Creating disaster recovery systems
• Supporting remote workers
• Running virtual desktops
• Scaling resources during busy periods
• Hosting specialist or legacy software

IaaS offers significant flexibility, but it still requires careful management. Moving a server into the cloud does not automatically make it secure, efficient or properly maintained.

Platform as a Service

Platform as a Service, or PaaS, provides a managed environment where developers can build, test and deploy applications.

With PaaS, the cloud provider manages much of the underlying infrastructure, including servers, storage, operating systems and development tools.

Developers can then focus on creating the application rather than maintaining the systems it runs on.

Examples of PaaS services include Microsoft Azure App Service, Google App Engine and AWS Elastic Beanstalk.

What Does the Provider Manage?

The cloud provider will typically manage:

• Physical infrastructure
• Virtualisation
• Operating systems
• Development platforms
• Runtime environments
• Scaling tools
• Some security and maintenance functions

The customer remains responsible for the application, its data and how users access it.

When Is PaaS Suitable?

PaaS is often used by businesses developing their own applications, customer portals, internal systems or automation tools.

It can help development teams:

• Launch applications more quickly
• Reduce infrastructure management
• Scale applications more easily
• Standardise development environments
• Integrate systems using APIs
• Automate testing and deployment

PaaS can reduce development time, but businesses must still consider data protection, application security, access controls and dependency on the chosen provider.

Software as a Service

Software as a Service, commonly known as SaaS, is the cloud model most businesses use every day.

SaaS applications are hosted and managed by the software provider and accessed through a web browser, desktop application or mobile app.

Common examples include:

• Microsoft 365
• Microsoft Teams
• Salesforce
• Dropbox
• Xero
• Sage
• Zoom
• HubSpot

Rather than installing and maintaining the software on your own servers, you pay for access to the service, normally through a monthly or annual subscription.

What Does the Provider Manage?

The SaaS provider generally manages:

• The application
• Physical servers
• Operating systems
• Updates
• Availability
• Infrastructure
• Basic platform security

However, your business is still responsible for areas including:

• User accounts
• Permissions
• Multi-factor authentication
• Data retention
• Device security
• Employee training
• Application configuration

This distinction is important. The provider secures the cloud platform, but your business must still secure how the service is used.

When Is SaaS Suitable?

SaaS can be a good choice for businesses that want access to modern software without maintaining the underlying infrastructure.

Its benefits can include:

• Predictable subscription costs
• Automatic software updates
• Easier remote access
• Reduced server requirements
• Faster deployment
• Access from multiple devices
• Improved collaboration

Before adopting a SaaS platform, businesses should also review where data is stored, how it can be exported, what backup options are available and what happens if the subscription ends.

Public Cloud

A public cloud is a cloud environment shared across multiple customers and operated by a third-party provider.

Microsoft Azure, Amazon Web Services and Google Cloud are examples of public cloud providers.

Although customers share the provider’s overall infrastructure, their systems and data are logically separated.

Benefits of Public Cloud

Public cloud services can offer:

• Rapid scalability
• Reduced hardware investment
• Access to advanced technology
• Geographic redundancy
• Flexible pricing
• Strong availability
• Faster deployment

Public cloud platforms can be suitable for businesses of almost any size, provided they are configured and managed correctly.

Things to Consider

Public cloud does not mean that everything is automatically secured.

Misconfigured permissions, weak user accounts, missing backups and poorly managed applications can still expose a business to risk.

Costs can also increase unexpectedly if cloud resources are left running, oversized or not regularly reviewed.

Private Cloud

A private cloud is a cloud environment dedicated to a single organisation.

It may be hosted within the business’s own premises, within a data centre or by a specialist cloud provider.

Private cloud environments can provide greater control over infrastructure, security settings, data location and system performance.

Benefits of Private Cloud

Private cloud may offer:

• Greater control
• Dedicated resources
• Custom security requirements
• Improved support for specialist applications
• Greater visibility over data location
• More predictable performance

Things to Consider

Private cloud environments can be more expensive and complex to manage than public cloud services.

They may require specialist knowledge, ongoing maintenance, capacity planning and investment in redundancy.

A private cloud may be particularly relevant to businesses with strict regulatory, performance or application requirements.

Hybrid Cloud

A hybrid cloud combines private infrastructure with public cloud services.

For example, a business may keep a specialist application on a private server while using Microsoft 365, Azure backup and cloud-based security tools.

Hybrid environments are extremely common because businesses rarely move every system to the cloud at the same time.

Benefits of Hybrid Cloud

Hybrid cloud can provide:

• Flexibility
• A gradual route to cloud adoption
• Continued use of existing systems
• Improved disaster recovery
• Support for legacy applications
• Greater control over sensitive data

Things to Consider

Hybrid environments can become complicated if they are not properly designed.

Businesses must manage:

• Connections between systems
• User identities
• Security policies
• Backups
• Data movement
• Monitoring
• Support responsibilities

A hybrid cloud strategy should be properly documented so that the business understands which systems are hosted where and who is responsible for maintaining them.

Multi-Cloud

A multi-cloud approach uses services from more than one cloud provider.

For example, a business may use Microsoft 365 for productivity, Amazon Web Services for an application and another provider for backup.

This approach may be deliberate, or it may develop gradually as different departments adopt different services.

Benefits of Multi-Cloud

Multi-cloud environments can provide:

• Access to specialist services
• Reduced reliance on one provider
• Greater flexibility
• Improved resilience
• The ability to select the best platform for each workload

Things to Consider

Using multiple providers can increase complexity.

Different cloud platforms may have different management portals, security systems, pricing structures and technical requirements.

Without proper oversight, a multi-cloud environment can lead to duplicated services, inconsistent security and unnecessary costs.

Which Cloud Computing Model Is Best?

There is no single cloud model that is right for every business.

The most appropriate option will depend on:

• Business size
• Existing systems
• Compliance requirements
• Security needs
• Budget
• Application requirements
• Remote working needs
• Growth plans
• Internal IT capabilities

Many businesses will use a combination of SaaS applications, public cloud infrastructure and retained on-premises systems.

The important thing is to make these decisions as part of a wider IT strategy rather than adopting individual cloud services without considering how they work together.

Questions to Ask Before Moving to the Cloud

Before selecting a cloud platform or service, your business should consider:

• What problem are we trying to solve?
• What data will be stored in the service?
• Who will have access?
• Is multi-factor authentication available?
• How will the data be backed up?
• Can the service meet our compliance requirements?
• What happens during an internet outage?
• Can we easily export our data?
• What support is available?
• How will costs be monitored?
• Who is responsible for security and maintenance?
• Does the solution integrate with our existing systems?

These questions can help prevent expensive mistakes and ensure the cloud service supports the long-term needs of the business.

Cloud Security Is a Shared Responsibility

One of the most common misunderstandings surrounding cloud computing is that the provider takes responsibility for everything.

In reality, cloud security normally follows a shared responsibility model.

The cloud provider is responsible for protecting the underlying platform and physical infrastructure. The customer is responsible for how the service is configured and used.

Depending on the cloud model, your responsibilities may include:

• User account security
• Access permissions
• Multi-factor authentication
• Data classification
• Device management
• Backup and retention
• Employee awareness training
• Application configuration
• Monitoring suspicious activity

A cloud platform can offer powerful security features, but those features must be enabled, configured and monitored correctly.

Avoid Moving Problems into the Cloud

Cloud migration should not simply involve copying an existing system into a new hosting environment.

Before moving systems, businesses should review:

• Whether the application is still needed
• Whether data should be cleaned up
• Whether user permissions are correct
• Whether the new environment is appropriately sized
• Whether backup and disaster recovery plans are suitable
• Whether old accounts and systems can be removed
• Whether the application could be replaced with a modern SaaS alternative

A well-planned migration can improve performance, security and resilience. A poorly planned migration may simply move existing problems into a more expensive environment.

How Hamilton Group Can Help

Choosing the right cloud computing model requires more than selecting a provider and purchasing a subscription.

Hamilton Group can help your business assess its existing technology, identify suitable cloud services and build a practical cloud strategy.

We can assist with:

• Microsoft 365
• Microsoft Azure
• Cloud migrations
• Virtual desktops
• Cloud backup
• Identity and access management
• Cybersecurity
• Device management
• Hybrid infrastructure
• Ongoing IT support

Whether you are considering your first cloud service or reviewing an existing environment, we can help you create a secure, manageable and cost-effective solution.

To discuss your cloud requirements with Hamilton Group, call us on 0330 043 0069.

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