Colocation vs Cloud: When Should You Use Each?

Businesses reviewing their infrastructure often frame the decision as a choice between colocation vs cloud.

Should existing servers be moved into a data centre, or should applications and data be migrated into a public cloud platform? In practice, the answer is rarely as simple as choosing one and rejecting the other.

Colocation and cloud solve different infrastructure challenges. Each offers distinct advantages in areas such as control, scalability, cost, performance and management responsibility. Many businesses gain the strongest outcome by combining them within a hybrid architecture.

The right decision depends on the workloads involved, how predictable demand is, the level of control required and how the infrastructure is expected to develop.

This guide compares colocation vs cloud across the factors that matter most and explains when each option is likely to make sense.

Understanding cloud infrastructure

Cloud computing allows a business to access computing resources through a service provider rather than buying and operating all the underlying physical infrastructure itself.

These resources may include:

• Processing power
• Data storage
• Databases
• Networking
• Security services
• Development platforms
• Business applications
• Backup and recovery services
• Artificial intelligence tools
• Analytics platforms

The best known cloud model is public cloud.

With public cloud, a provider operates a large shared infrastructure platform. Customers provision and pay for the resources they use without owning the physical servers beneath them.

Cloud services are commonly divided into three broad categories.

Infrastructure as a Service (IaaS)

Infrastructure as a Service provides virtual machines, storage, networking and related infrastructure components.

The cloud provider manages the physical data centre and hardware. The customer remains responsible for areas such as operating systems, applications, access controls, configuration and data.

Platform as a Service (PaaS)

Platform as a service provides a managed environment in which developers can build and run applications. The provider takes responsibility for more of the underlying infrastructure and software platform, allowing the customer to focus on application development and data.

Software as a Service (SaaS)

Software as a service provides a complete application through a subscription or usage-based model. Examples include email, customer relationship management, collaboration, accounting and human resources platforms.

The provider manages the application and underlying infrastructure, although the customer still has responsibilities relating to configuration, users, data and access.

Understanding colocation

Colocation allows a business to install its own physical servers, storage and network equipment inside a specialist data centre.

The customer normally continues to own or lease the hardware. The colocation provider supplies the environment needed to keep it running, including:

• Secure rack space
• Electrical power
• Backup power
• Cooling
• Physical security
• Environmental monitoring
• Network connectivity
• Remote support options

The customer retains direct control over the hardware, operating systems, applications and data unless additional managed services are included.

This makes colocation particularly relevant to businesses that have existing infrastructure investments, specialist systems or workloads that are not well suited to public cloud.

Colocation can also provide the foundation for private cloud. The business can create a cloud style environment using dedicated infrastructure hosted in the data centre.

For a fuller introduction, check out our colocation page here.

What does a colocation provider supply?

The exact scope of colocation services varies between providers, but the main components normally include the following.

Colocation vs cloud at a glance

The main difference between colocation and cloud concerns ownership and responsibility.

With colocation, the business controls the physical infrastructure but places it within a provider managed data centre.

With cloud, the provider owns and operates the physical infrastructure, while the customer consumes technology resources as a service.

That difference affects almost every area of the comparison.

These are general distinctions. Actual outcomes will depend on the design, provider, commercial model and workload.

Colocation vs cloud cost comparison

Cost is one of the most important and most misunderstood parts of the colocation vs cloud decision.

Cloud is often described as an operating cost model, while colocation involves more capital expenditure. This is broadly accurate, but it does not tell the full story.

Colocation costs

A colocation environment may include costs for:

• Hardware purchase or leasing
• Rack space
• Power
• Connectivity
• Installation
• Migration
• Hardware support
• Software licences
• Monitoring
• Remote hands
• Managed services
• Hardware refreshes

Some costs are incurred at the start of the project, particularly when new equipment is required.

Ongoing colocation costs can be relatively predictable when the environment and power demand remain stable.

Cloud costs

Public cloud costs may include:

• Virtual machine usage
• Storage capacity
• Database services
• Backups
• Data transfer
• Internet egress
• Private connectivity
• Security services
• Monitoring
• Management tools
• Support plans
• Reserved capacity
• Software licences

Cloud can reduce the need to buy hardware upfront. It also allows resources to be provisioned quickly and removed when no longer required.

However, cloud costs can become harder to forecast when environments grow without strong governance.

Unused virtual machines, oversized resources, duplicate data, excessive storage retention and data transfer charges can all increase expenditure.

Which is cheaper?

Neither colocation nor cloud is always cheaper. Cloud can be commercially effective where:

• Demand changes significantly
• Resources are only needed temporarily
• The workload can be switched off outside operating hours
• The business is growing rapidly
• Geographic expansion is required
• The application is designed to use cloud services efficiently
• The business wants to avoid capital investment

Colocation can be commercially effective where:

• Demand is stable and predictable
• Hardware is already owned
• Systems run continuously
• Large amounts of data are processed or stored
• The infrastructure has a long expected lifespan
• Public cloud data transfer costs would be significant
• Specialist hardware is required
• The business needs dedicated performance

The most accurate comparison should examine total cost of ownership over an agreed period rather than focusing on the monthly headline price. check out our cloud page here. 

Performance comparison

Performance depends on more than whether infrastructure is hosted in cloud or colocation.

Application design, network connectivity, hardware specification, storage configuration, location and management all influence the user experience.

Performance in colocation

Colocation gives a business direct control over the physical hardware including factors like:

• Processor models
• Memory capacity
• Storage architecture
• Graphics processing units
• Network interfaces
• Security appliances
• Hardware accelerators
• Specialist platforms

This can provide consistent performance for applications with steady demand or specific hardware requirements.

Resources are dedicated to the business rather than drawn from a shared cloud platform.

Colocation can also be positioned close to business sites, network providers or public cloud connectivity to reduce latency.

Performance in cloud

Public cloud provides access to a wide range of configurable resources.

Businesses can choose different machine types, storage tiers, databases and managed services according to the workload.

Cloud is especially effective when an application can scale horizontally, distribute demand and use cloud native services.

However, poor configuration can reduce performance or increase cost. An environment may be undersized, oversized or dependent on network connections that have not been designed around the application.

Questions to consider

When comparing performance, ask:

• Does the workload require a specific hardware configuration?
• Is demand constant or variable?
• How sensitive is the application to latency?
• Where are the users and dependent systems located?
• Does the workload process large volumes of data?
• Can the application scale across multiple cloud resources?
• Would dedicated infrastructure provide more consistent performance?
• How quickly must additional capacity become available?

The answer may differ for each application.

Flexibility and scalability

Cloud is often associated with rapid scalability.

Resources can usually be provisioned much faster than new physical hardware can be ordered, installed and configured.

This is valuable for:

• Seasonal demand
• Development and testing
• New product launches
• Temporary projects
• Rapid growth
• Uncertain workload volumes
• International expansion

A retailer may need significantly more processing capacity during a peak trading period. A development team may require temporary environments for a project. A new digital service may have unpredictable demand.

Public cloud can respond to these scenarios without the business buying enough hardware to cover the maximum possible requirement.

Colocation can also scale, but the process is different.

A business can increase rack space, power and connectivity, but additional computing capacity normally requires physical equipment. This means growth needs to be anticipated and planned.

For stable workloads, this does not necessarily create a problem. The environment can be designed with spare capacity and expanded in a controlled way.

The key distinction is between rapid, flexible consumption and planned physical growth.

Control and customisation

Colocation provides a high degree of infrastructure control.

The business can choose the hardware, security appliances, network design, hypervisor and operating systems. It can also decide when equipment is replaced and how the environment is configured.

This may be important where:

• Applications require specific hardware
• Legacy systems remain operationally important
• Software licensing is linked to physical infrastructure
• The business uses specialist network or security devices
• Data handling policies require dedicated equipment
• Performance needs to remain consistent
• Existing investments still deliver value

Cloud provides flexibility at the service level, but the underlying platform remains controlled by the provider.

Customers select from the services and configurations made available. This can still offer extensive choice, but it is different from having direct control of the physical infrastructure.

The right level of control should reflect the workload rather than becoming a goal in itself.

Full hardware control can be valuable, but it also creates additional management responsibility.

Security and compliance

Both colocation and public cloud can support strong security and compliance.

Neither is automatically secure simply because it uses a professional data centre.

Security depends on architecture, configuration, monitoring, access controls, governance and ongoing management.

Security in colocation

The colocation provider is normally responsible for the physical facility, including areas such as:

• Building security
• CCTV
• Access control
• Environmental monitoring
• Power resilience
• Cooling
• Fire detection
• Rack security

The customer remains responsible for:

• Operating system security
• Network security
• Firewalls
• User access
• Patching
• Data protection
• Application security
• Backup
• Monitoring
• Incident response

These responsibilities can be transferred to a managed service provider where required.

Security in public cloud

Public cloud operates through a shared responsibility model. The provider secures the underlying physical infrastructure and cloud platform. The customer remains responsible for the areas it controls, which may include:

• User identities
• Permissions
• Data
• Application configuration
• Virtual networks
• Encryption settings
• Monitoring
• Workload security
• Compliance policies

Many cloud incidents result from weak configuration, excessive permissions or poor visibility rather than a failure of the cloud platform itself.

Compliance considerations

Businesses should assess:

• Where data is stored
• Who can access it
• How it is encrypted
• How activity is logged
• Which suppliers are involved
• How data is backed up
• How incidents are handled
• How systems are recovered
• What evidence is available for audits
• Whether data must remain within a particular jurisdiction

Colocation may provide additional control over where systems and data physically reside.

Cloud can provide extensive compliance capabilities, but customers still need to configure and govern services correctly.

Management responsibility

Cloud can reduce responsibility for physical hardware. The provider manages the data centres, servers and core platform. Managed cloud services can also reduce the amount of operating system, database or application maintenance required.

Colocation moves infrastructure out of the business premises but does not automatically remove the need to manage it. The customer may still need to:

• Monitor hardware
• Replace failed components
• Apply patches
• Manage operating systems
• Maintain virtualisation platforms
• Configure networks
• Manage backups
• Test recovery
• Plan hardware refreshes

This distinction is important.

A business that chooses colocation because it wants infrastructure control must ensure it has the skills and processes required to manage that environment.

Alternatively, colocation can be combined with managed infrastructure services. The provider can then monitor, maintain and support the equipment on the customer’s behalf.

Availability and resilience

Both cloud and colocation can support highly resilient services, but resilience must be designed.

A single server in a secure colocation facility remains a single server. If it fails, the application may still become unavailable.

Likewise, placing an application in one public cloud region does not automatically protect it from every outage or configuration problem.

A resilient design may require:

• Multiple servers
• Redundant storage
• Diverse connectivity
• Backup power
• Data replication
• Load balancing
• Automated failover
• Secondary sites
• Multiple availability zones
• Tested recovery procedures

Colocation can support resilience through paired data centres. A business may run its primary infrastructure in one facility and replicate data or applications to a second geographically separated site.

Public cloud can support resilience across availability zones and regions. The most appropriate approach depends on the recovery time objective, recovery point objective, application design and available budget.

Hybrid cloud colocation

Hybrid cloud colocation combines colocated infrastructure with public cloud services.

This is not simply a compromise between two approaches. It allows businesses to select the most appropriate environment for each workload.

A hybrid architecture might include:

• Core databases on dedicated colocated hardware
• Customer facing applications in public cloud
• Private cloud hosted in colocation
• Cloud based analytics
• Software as a Service applications
• Colocated backup infrastructure
• Public cloud disaster recovery
• Direct connectivity between data centre and cloud platforms

This model can help businesses retain control over established or sensitive systems while adopting cloud services where they provide clear value.

Example hybrid architecture

Consider a business running a mature enterprise resource planning platform.

The application is stable, runs continuously and depends on a large database. Rebuilding it for public cloud would require significant time and investment.

The business could move the existing infrastructure into colocation, improving physical resilience and connectivity.

It could then use public cloud for:

• Customer portals
• Mobile applications
• Analytics
• Development environments
• Artificial intelligence
• Backup storage
• Temporary capacity

The environments can be connected securely, allowing the business to modernise without forcing every system through the same migration path.

When should you use colocation?

Colocation may be appropriate when:

• You have valuable existing hardware
• Workloads are stable and predictable
• Applications require specific equipment
• You want to move away from an office server room
• You need direct control over infrastructure
• You need a private cloud platform
• Systems run continuously
• Large data volumes make cloud transfer expensive
• You require dedicated performance
• You need a secondary disaster recovery site
• You want to modernise without replacing every system
• Building your own data centre is not practical

Colocation is especially useful when the infrastructure remains fit for purpose but the environment supporting it does not.

When should you use public cloud?

Public cloud may be appropriate when:

• Demand changes regularly
• Rapid scalability is important
• You need to launch services quickly
• Workloads are temporary
• Applications are cloud native
• You need access to managed databases or analytics
• You want to reduce hardware management
• The business is expanding internationally
• You require development and testing environments
• The application benefits from distributed cloud services
• Upfront capital investment needs to be limited

Cloud is often most effective when applications are designed or adapted to use its capabilities rather than simply copying an existing server environment into virtual machines.

Decision framework

A structured decision framework can help businesses avoid making infrastructure choices based on assumptions. Assess each workload against the following areas.

Business importance

How seriously would the business be affected if the system became unavailable?

Critical systems may require stronger resilience, recovery and support arrangements regardless of hosting model.

Demand pattern

Does resource consumption remain stable, or does it vary significantly?

Stable workloads may suit dedicated infrastructure. Variable workloads may benefit from cloud scalability.

Application design

Was the application built for physical infrastructure, virtual machines or cloud native services?

Moving an application without considering its design can create unnecessary cost and complexity.

Performance

Does the application require dedicated hardware, low latency or high data throughput?

Security and compliance

Are there specific requirements for data location, physical control, logging or access?

Existing investment

Does the business already own infrastructure that still has useful life?

Internal skills

Can the team manage physical infrastructure, cloud environments or both?

Commercial model

What is the total cost over three, five or seven years?

Include migration, connectivity, management, licensing, support and recovery rather than comparing headline prices.

Future strategy

Is the business planning to modernise, consolidate, expand or replace the application?

The target architecture should support the planned direction rather than only solving the immediate problem.

Avoiding an either/or decision

Colocation vs cloud is often presented as a competition between traditional and modern infrastructure.

That view is too simplistic.

Colocation can support modern private cloud, high performance computing, hybrid applications and direct connections to public cloud platforms.

Cloud can support established applications, but it may not always be the most commercially or operationally appropriate location.

The objective should be to place each workload in the environment that best supports its requirements.

For many businesses, that leads to a combination of:

• Public cloud
• Private cloud
• Colocation
• Software as a service
• Managed infrastructure
• Limited on premise systems

The quality of the integration between these environments matters as much as the individual platforms.

How Digital Space can help

Digital Space helps businesses assess, design and manage infrastructure across colocation, private cloud, public cloud and connectivity.

We begin by understanding:

• Your current infrastructure
• Application dependencies
• Business priorities
• Performance requirements
• Security and compliance needs
• Existing investments
• Recovery objectives
• Future plans

This allows us to compare infrastructure options using your operational and commercial requirements rather than applying a standard answer.

Where a hybrid model is appropriate, we can help connect colocated infrastructure with cloud platforms, business sites and users.

Our UK data centre facilities can also support geographically separated production and recovery environments, helping businesses strengthen resilience as part of a wider infrastructure strategy.

Compare colocation and cloud against your requirements

Colocation and cloud both provide valuable infrastructure options.

Cloud offers rapid access to scalable resources and managed services. Colocation provides hardware control, consistent performance and a professional environment for private infrastructure.

The right answer may be one, the other or a carefully integrated combination of both.

Request a custom infrastructure comparison to evaluate colocation, cloud and hybrid options against your workloads, costs and future plans.