Which cloud environment is best for your business?
Public, private and hybrid cloud compared, with the questions that actually decide the choice.
By the Telappliant team
Public, private and hybrid cloud are all sold as the obvious answer by whoever is selling them. The right choice depends on your regulatory requirements, your existing systems and how predictable your workloads are, not on which model is currently fashionable.
Public cloud: the default for most UK SMEs
Public cloud (Microsoft 365, Azure, AWS shared infrastructure) suits businesses without unusual regulatory constraints, with variable or growing usage, and without heavy investment in legacy on-premise systems. Costs scale with usage, there is no capital outlay, and Microsoft or the equivalent provider handles the physical infrastructure entirely.
Private cloud: for specific, defensible reasons
- A regulatory requirement for dedicated, non-shared infrastructure
- Extremely predictable, steady-state workloads where public cloud's flexibility offers no benefit
- Legacy applications that cannot be re-architected for public cloud and need dedicated resource
- A contractual client requirement specifying isolated infrastructure
Hybrid cloud: usually a transition state, not a destination
Hybrid, keeping some systems on-premise or in private cloud while moving others to public cloud, is common where a legacy line-of-business application cannot move yet, where data residency rules apply to part of the estate only, or during a phased migration. It is rarely the ideal long-term architecture; it is what businesses run while working towards one.
The questions that actually decide this
- Do we have a specific regulatory or contractual requirement for data location or isolation?
- How variable is our workload - steady and predictable, or spiky and growing?
- What legacy systems do we have, and can they realistically move to public cloud?
- What does our existing Microsoft or cloud licensing already give us for free?
- What is our actual appetite and budget for managing infrastructure ourselves versus letting a provider manage it?
The cost comparison people get wrong
Public cloud is not automatically cheaper; it is cheaper when usage is managed actively, with right-sizing, scheduled shutdowns and reserved pricing. Private cloud is not automatically more secure; security depends on configuration, patching and monitoring in either model. Compare like-for-like total cost including management overhead, not just the headline infrastructure price.
A sensible decision path for most businesses
- Default to public cloud unless you can name a specific reason not to
- Move applications one at a time, starting with the lowest-risk, highest-benefit workload
- Keep genuinely legacy or regulated systems on private or on-premise infrastructure until there is a clear migration path
- Review the decision annually, since both regulatory requirements and cloud offerings change
