Public Cloud Outsourcing
Definition
Public Cloud Outsourcing
Public cloud outsourcing is contracting a provider to run your own workloads on the shared cloud infrastructure owned and operated by a hyperscale vendor. You buy elastic capacity and managed operations, and you share the platform with everyone else.
Elasticity is the genuine advantage — capacity arrives in minutes rather than months, and it goes away again the moment demand falls.
Cost control is the discipline nobody budgets for — consumption pricing means the bill grows quietly unless somebody is watching it every month.
Responsibility is shared between three parties here, not two — the vendor secures the platform, the managed provider operates your environment, and you remain accountable for your own data.
Key takeaways
- Elastic capacity is the main advantage over dedicated infrastructure.
- Responsibility is shared between vendor, provider, and customer.
- Consumption pricing needs active cost management from day one.
- Data residency and egress terms should be checked before committing.
How it works
A managed provider designs the environment, deploys workloads onto the hyperscale platform, then operates them: monitoring, patching, scaling, and securing everything above the vendor’s own layer. The customer keeps its accounts, its data, and its standards.
The shared responsibility model is where confusion starts. The vendor secures the platform, and everything you configure on top of it remains yours to get right.
The deployment models have a standard definition. NIST Special Publication 800-145, published in September 2011, defines public cloud alongside private, community, and hybrid deployment.
Region choice is an early decision that is expensive to revisit. Data residency, latency, and available services all differ by region, and moving afterwards means moving everything.
| Responsibility | Hyperscale vendor | Managed provider | Customer |
|---|---|---|---|
| Physical infrastructure | Yes | No | No |
| Platform security | Yes | No | No |
| Environment configuration | No | Yes | Standards |
| Workload operations | No | Yes | Approval |
| Data and access | No | Supports | Owns |
Assessment frameworks exist for assurance. FedRAMP provides a standardised approach to security assessment and authorisation for cloud services used by federal agencies.
Cost management should be contractual. Agree who monitors spend, who can commit to reserved capacity, and who is accountable when a bill jumps unexpectedly.
Egress charges catch people out at exactly the wrong moment. Moving large volumes of data out costs real money, and that becomes obvious only when you decide to leave.
Examples
Public cloud outsourcing suits variable workloads, fast-growing estates, and organisations that have no deep platform skills of their own. Four cases show the range of arrangements.
A media company. Streaming capacity scales for live events and contracts afterwards, with a provider managing the environment continuously.
A retailer. Peak trading capacity is provisioned automatically, and a managed provider handles cost optimisation between the seasonal peaks.
A start-up. Its whole estate runs on public cloud under a managed arrangement, with no internal infrastructure staff at all.
A public agency. Citizen-facing services run on assessed cloud services, while a small internal team retains architectural authority over the design.
Across all four, cost discipline separated the good outcomes. Where nobody owned the monthly bill, spend drifted upward until it triggered a review nobody had planned.
Related terms
Public cloud outsourcing sits among the cloud delivery choices, bordered by the alternative tenancy models and the roles that operate them. The list below marks the boundaries.
- Cloud Managed Services: operating cloud environments of any tenancy model.
- Cloud-Based: the general deployment approach this is one variant of.
- Infrastructure Outsourcing: the wider estate including anything not in cloud.
- Software as a Service (SaaS): consuming applications rather than running infrastructure.
- Cloud Architect: the role designing the target environment and its guardrails.
- IT Managed Services: the broader flat-fee contract this often sits inside.
- Network Operations Outsourcing: the connectivity that reaches the cloud estate.
FAQ
Who is responsible for security?
It is shared. The vendor secures the platform, the managed provider configures and operates your environment, and you remain accountable for data and access.
Is public cloud cheaper than private?
Per unit usually, and total cost depends on discipline. Unmanaged consumption pricing can exceed dedicated infrastructure within a year.
What is the biggest cost surprise?
Egress charges and idle resources. Both are avoidable, and both need somebody explicitly accountable for reviewing the bill each month.
Can regulated workloads run on public cloud?
Often yes, subject to data residency rules and assessment. Check the specific regulator position rather than assuming either way.
Who owns the cloud accounts?
The customer should, with the provider holding scoped access. Accounts in a provider’s name make changing partners far harder.
What should be agreed before signing?
Cost accountability, egress terms, data residency, and exit process including a tested export. All four are easier to negotiate upfront.
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