Cloud Planning
Part of Cloud infrastructure planning for businesses
Public cloud, private infrastructure and hybrid setups compared
Compare public cloud, private infrastructure and combined setups by operating work, workload fit, data placement and recovery needs.
Choose a deployment setup by deciding where each workload and its data run, who operates each component and what connections it needs. Public cloud supplies services without the business operating the provider's underlying infrastructure.
Private infrastructure uses dedicated capacity; maintenance duties depend on who owns and operates it. A combined setup adds connections and responsibilities across environments.
Use the terms precisely
Public cloud is cloud infrastructure offered for general use. Private cloud is cloud infrastructure for one organisation; it can operate on or off its premises. Conventional dedicated servers may be private infrastructure without the on-demand provisioning and elasticity associated with cloud computing.
Under the formal definition, hybrid cloud joins distinct cloud infrastructures using technology that supports data or application portability. Teams also use 'hybrid setup' more broadly for a connected mix of on-premises systems and public cloud. State which meaning you intend.
A network connection alone establishes neither portability nor a recovery path.
Compare the operating choices
| Decision | Public cloud | Private infrastructure | Combined setup |
|---|---|---|---|
| Capacity | Select and configure services within the provider's available options | Plan, acquire or contract for dedicated capacity | Plan capacity on each side and the link between them |
| Operations | Provider and customer tasks vary by service | Assign infrastructure tasks to the organisation or its contractor | Assign owners for both environments and their shared path |
| Placement | Check the exact service, region and configuration | Check equipment, facilities and software fit | Define which component and data copy lives where |
| Recovery | Check the configured service and recovery path | Provide and exercise a recovery path | Include cross-environment dependencies in the exercise |
No option is a universal cost or reliability winner. A managed public-cloud service may reduce infrastructure work while leaving the customer responsible for data, access and configuration.
Dedicated capacity may satisfy a particular constraint while requiring more direct operation. The division depends on the service and contract.
Pros and cons of public cloud, private infrastructure and hybrid setups
- Public cloud: ProsReduced infrastructure management burden; scalable on-demand resources; pay-as-you-go pricing; built-in redundancy and global reach
- Public cloud: ConsLimited control over underlying infrastructure; potential for vendor lock-in; data residency concerns (especially if stored overseas); ongoing cost visibility required
- Private infrastructure: ProsFull control over hardware, software and data location; better compliance with strict regulatory requirements; predictable performance and uptime; suitable for legacy systems
- Private infrastructure: ConsHigher upfront capital costs; greater operational overhead; slower scalability; requires skilled IT staff and maintenance planning
- Hybrid setup: ProsFlexibility to run sensitive workloads on-premises while leveraging public cloud for scalability; supports gradual migration; enables disaster recovery across environments
- Hybrid setup: ConsIncreased complexity in management, networking and security; requires robust integration and monitoring; risk of latency or failure in inter-environment connections
Test the fit workload by workload
Examine public cloud when the required service and controls are available and the team can operate its share of the design. Confirm data location, access, integration and recovery for the exact service and configuration. The label 'public cloud' does not settle those details.
Private infrastructure may suit a workload with a particular local dependency, equipment arrangement or control requirement. Record the constraint and the work needed to meet it: spare capacity, replacements, patching, monitoring and recovery. Allocate those duties under the actual operating arrangement.
A combined setup can keep one component close to an existing system while another runs in public cloud. Record which users and services cross the connection, the data transferred, acceptable delay and what happens if the connection fails. Consider whether the workload can continue in a reduced mode.
Make the comparison useful
Create one row per workload with its owner, placement constraint, data classification, important dependencies, recovery targets and preferred option. Mark unresolved points for verification. For an Australian organisation handling personal information, assess overseas access and handling in its circumstances; an Australian region alone is not a complete answer.
Choose an arrangement the responsible team can operate within the agreed requirements. If a combined design is preferred, include its network, identity, data and recovery arrangements in the decision record before implementation.
