The decision should start with the workload — not the hardware.
Microsoft recommends starting hybrid architecture decisions from workload and organisational requirements. Managed cloud services make sense where requirements allow, while local compute can be justified by latency, physical-system dependencies, data constraints or operational independence.
In practice, that means there is no universal answer. A business can keep email and collaboration in the cloud, run a legacy ERP locally, store backups off-site and still manage both environments as one architecture.
Do not choose on-premises, cloud or hybrid because of fashion. List applications, data, dependencies, latency, availability, security, cost and recovery goals. Then decide workload by workload.
On-premises server
Infrastructure inside the business or directly controlled datacentre. It can fit workloads with physical dependencies, very low local latency or specific constraints.
Cloud
Infrastructure and services consumed from a cloud provider. It makes scaling, managed services and shifting upfront investment to operating expenditure easier.
Hybrid
Combines local and cloud resources. Keep what needs proximity local while using cloud for collaboration, backup, expansion, management or new services.
Eight factors that should shape the decision.
Quick comparison: where each model tends to be strongest.
Why is hybrid often the most realistic answer?
Microsoft describes hybrid architectures as combinations of Azure services with infrastructure in datacentres, edge locations and other clouds. Technologies such as Azure Arc can manage physical and virtual servers outside Azure as resources in a common management plane. For many SMBs, that allows modernisation without forcing everything to move at once.
Cloud does not automatically mean “cheaper”. On-premises does not automatically mean “more expensive”.
Cloud often shifts spending from CapEx toward OpEx. That can reduce upfront investment and make capacity easier to adjust, but poorly governed consumption can raise cost. On-premises requires more initial investment, yet some stable workloads can remain economically competitive. Compare total ownership and operating cost rather than only monthly cloud price or server purchase price.
Not every workload should migrate in the same way.
Microsoft's Cloud Adoption Framework recommends choosing a strategy per workload. A system might be retained, rehosted, replatformed, refactored, rearchitected, replaced with SaaS or retired. The right choice links technical effort to a concrete business driver.
How PCenter can assess the environment
Start with a real inventory: servers, applications, users, dependencies, data volumes, network, backup, licensing and continuity targets. Each workload can then be classified for on-premises, cloud, hybrid, replacement or retirement.