For hosting infrastructure, build, buy, and open source are not three mutually exclusive choices. “Build” describes who assembles and operates a platform; “buy” describes procuring infrastructure or a managed service; “open source” describes software licensing. Open-source software can be self-hosted or purchased as a managed service. Choose by comparing who will own each security and maintenance task, the full operating cost, and the control and compliance your workload requires—not by assuming one model is inherently safer or cheaper.
What are you actually choosing?
A useful comparison separates the software’s license from the way it is operated. A team can build on purchased cloud infrastructure, run open-source software on that infrastructure, or buy a managed platform built on open-source components. These combinations have different responsibility boundaries even when they use similar technology.
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- Build: Your organization assembles and operates more of the platform itself. That could mean operating infrastructure on premises or managing virtual machines and platform components in a cloud environment.
- Buy: You procure infrastructure or a service. Buying infrastructure alone does not mean the provider operates your guest operating system, application, or security configuration; a managed service may take on more of that work.
- Open source: You use software whose licensing and development model is open source. You still decide who hosts, configures, patches, backs up, monitors, and supports it.
For a fair decision, compare operating models rather than labels. “Open source” does not automatically mean self-hosted, and “cloud” does not automatically mean fully managed.
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How do security responsibilities change?
Responsibility follows the service boundary. The UK National Cyber Security Centre (NCSC) says an organization operating its own on-premises service is responsible for that service’s security. In cloud, the provider protects some underlying infrastructure, while customer duties depend on the service and its configuration. The customer still has to decide whether the service meets its needs, configure it securely, and choose what data to store.
The NCSC’s recommendation is: “You should therefore, delegate as much responsibility for security to your hyperscale cloud platform as you can.” That advice sits alongside the customer’s responsibility to select a suitable service, secure its configuration, and make sound data decisions. It is a reason to assess managed options, not a rule to buy a particular service regardless of fit.
| Operating model | Provider or supplier may handle | Customer or operator still needs to assess or handle |
|---|---|---|
| On-premises, self-hosted | No cloud infrastructure provider is implied by this model. | The organization operates and secures the service and the components it owns or runs. |
| Infrastructure as a service (IaaS) | Foundational compute, storage, and networking. | Depending on the service, the customer may manage guest operating-system updates and security patches, installed software, applications, and configuration such as security groups. AWS uses EC2 as an example of this division. |
| Platform as a service (PaaS) or managed platform | The provider may operate more of the platform, but the boundary varies by service. | Secure the application, identities, data, and customer-controlled settings; verify the service’s update and maintenance process and which controls remain yours. |
| Container service | Some services manage the application and orchestration platform. | Other services leave customers to maintain images and configure or host orchestration. The word “container” alone does not establish the boundary. |
| Managed service provider involved | The provider may perform operations that require privileged access. | Review least privilege, auditability, the provider’s management infrastructure, incident-response commitments, and supplier-chain responsibilities. |
The NCSC recommends considering PaaS rather than IaaS when building or hosting an application, and SaaS where a suitable service exists, because these models can delegate more responsibility. Treat this as guidance to evaluate service fit: a higher-level service is not automatically suitable for every workload or requirement.
Which security and business risks should you compare?
Security work that remains with your team
A managed service can reduce the infrastructure and platform work in your security scope, but it does not remove customer security duties. Depending on the service, a provider may take on infrastructure, operating systems, patching, backups, or platform operations. Your team still needs to understand how and when maintenance occurs and protect the application, identities, data, and configuration it controls. A service with a clear division of duties is easier to operate safely than one whose boundary is assumed rather than verified.
Operational capacity and continuity
Building or self-hosting makes your organization responsible for sustaining the service, not just setting it up. Consider whether the team can provision, patch, monitor, back up, recover, and respond to incidents over the service’s full life. Include engineering and on-call capacity in the decision. A purchase can reduce some of that work, but the scope depends on the contract and service; determine who responds to an incident and how provider actions fit your own response process.
Control, portability, and dependency
Self-managed infrastructure can offer more direct control over the stack, but also leaves more implementation and maintenance work with the operator. Managed platforms can simplify operations while making the service’s capabilities, maintenance process, and terms more consequential to your architecture. Assess how difficult it would be to move data or workloads, which components are service-specific, and what operational options remain if you need to change providers. The relevant trade-off is not simply “control versus convenience”; it is whether the control you retain is important enough to justify owning the associated work.
Jurisdiction, data handling, and assurance
Cloud use can bring contractual, jurisdictional, and organizational considerations, including questions about data handling and location. A provider’s controls or audit evidence may help support your compliance work, but do not by themselves establish that the service meets your organization’s obligations. Check the applicable service terms, data arrangements, evidence available to you, and the controls your own team must operate.
Provider capability and incident coordination
Neither a large provider nor an in-house team should be treated as secure by default. Evaluate the actual design, operator capabilities, support arrangements, assurance evidence, and how responsibility is divided when something goes wrong. Where a managed provider has privileged access, include that access and the provider’s own operating environment in the risk assessment.
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Compare the full cost of keeping the service secure and reliable, not just a server purchase, cloud invoice, or software license. AWS specifically cautions that security management should be included in the total cost of ownership (TCO) for self-managed virtual-machine hosting. Build a cost model around the work and services required by your design:
- Infrastructure, service, software, and support charges.
- Provisioning, configuration, and engineering time.
- Security patching, upgrades, and ongoing maintenance.
- Backups, monitoring, and incident response.
- Security controls and compliance evidence.
- On-call coverage and the effort required to operate the platform.
Managed services may reduce provisioning, software setup, patching, backup, and related security-management work, depending on what the service includes. They can also introduce service charges and provider dependencies that need to be evaluated. No universal break-even point or savings percentage follows from these trade-offs: it depends on the workload, service boundary, and available staff.
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When does each operating model make sense?
Build or self-host when you can own the lifecycle
Consider a self-managed approach when you have a specific need for direct control and the people, processes, and budget to operate the platform continuously. Before choosing it, name the owners for patching, backups, monitoring, security configuration, and incident response. If those responsibilities have no credible owner, the apparent control may come with an unmanaged risk.
Buy a managed service when delegated work fits your needs
Consider a managed platform when its capabilities and service terms fit the workload and delegating selected operational controls would help your team. Confirm exactly what the provider operates, what remains your responsibility, how updates are delivered, and what evidence and support are available. “Managed” is not a complete description of the division of work.
Use open-source software when the license and operating model both fit
Open source may be self-hosted by your team or delivered through a commercial managed service. Assess the software choice separately from the hosting decision: identify who maintains and patches the deployed components, who provides support, and who operates the surrounding platform. Do not assume the license alone determines the security, cost, or degree of control.
Best Value
A practical decision process
- Define the workload and constraints. Record the data involved, availability needs, regulatory obligations, location requirements, budget, team capacity, and procurement limits. These determine whether a service is viable; the labels build, buy, and open source do not answer them.
- List candidate service designs. Compare realistic combinations, such as a self-managed platform, IaaS with your team operating the guest environment, and a suitable managed platform. Include open-source components where relevant without treating them as an operating model by themselves.
- Map responsibilities by service. For each candidate, assign an owner for infrastructure, operating systems, applications, images or orchestration, identities, data, configuration, patching, backups, monitoring, and incident response. Verify uncertain boundaries in the service documentation and terms.
- Test operational readiness. Check whether the named owners can perform the work on an ongoing basis, including on-call response and coordination with any provider. Account for privileged supplier access and auditability.
- Estimate full TCO. Add provider and software charges to engineering, operations, security, support, and compliance effort. Compare options using the same workload assumptions instead of contrasting a managed-service invoice with only the hardware bill for self-hosting.
- Check compliance and exit conditions. Review service-specific data arrangements, jurisdiction, available assurance evidence, portability, and dependencies. Decide whether the controls and terms satisfy your organization’s requirements.
- Choose the boundary your team can govern. Select the option whose security responsibilities, operating effort, cost, and control are acceptable together. Document the remaining customer-owned controls and review the division when the service or workload changes.
Why there is no universal winner
A 2010 Microsoft Research paper by David Molnar and Stuart Schechter offers useful foundational framing: cloud services can raise shared-infrastructure and reduced-control concerns, including contractual, jurisdictional, and organizational issues, while scale and elasticity can make some security measures more affordable to providers. The paper cautions against treating cloud infrastructure as inherently less secure than self-hosted infrastructure. It is a conceptual analysis, not a current comparison of provider products, service terms, or prices.
Google Cloud describes inherited controls as evidence that may help customers with audits and frames “shared fate” as an ongoing provider-customer partnership. That is Google Cloud’s description of its own approach, not an independent assessment or a guarantee that a given service meets your requirements. In any provider relationship, assess the actual service, evidence, responsibilities, and operational arrangements.
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