Public, Private and Hybrid Cloud: Pros, Cons and Which Fits Your Business
“The cloud” is three different places, and the difference matters more for a small business than the marketing suggests. Public cloud is capacity rented from Microsoft, Amazon or Google, and the software-as-a-service applications built on it. Private cloud is infrastructure dedicated to one business, whether in its own building or run by a provider. Hybrid is any mix, and it is what most businesses actually have. This article, which absorbs an earlier comparison of the three, explains what each one means in practice, the honest pros and cons, what a hybrid setup looks like for a 30-person firm, what each costs and how to decide.
The three, side by side
| Public cloud | Private cloud (or hosting) | Hybrid | |
|---|---|---|---|
| What it is | Shared infrastructure rented by the hour or the month: Azure, AWS, Google Cloud, and SaaS such as Microsoft 365 | Dedicated servers for one business, in your building or a provider’s data center, including colocation of your own hardware | A mix, usually Microsoft 365 plus a private or hosted server plus something in a public cloud |
| Cost model | Pay for what you use; cheap when idle, expensive when steady; data transfer charged | Flat monthly fee or owned hardware; predictable; no charge for traffic | Each workload on the cheaper model for it |
| Control and location | Provider’s region; you control configuration, not hardware | You know the building, the rack and who has keys | Both, per workload |
| Scaling | Instant, effectively unlimited | Within the hardware you have; growth is planned | Elastic parts scale in public cloud; steady parts do not need to |
| Latency to the office | Depends on the region and the internet connection | Low, especially from a local data center | Per workload |
| Best for | Elastic or global workloads; email and files as SaaS; new applications | Steady, latency-sensitive or licence-bound systems; regulated data with location requirements | Nearly every business with an on-premises application and Microsoft 365 |
Public cloud: pros and cons
The hyperscale clouds are excellent at workloads that change shape: a seasonal peak, a new product, customers on three continents. They let a business start something in an afternoon with no hardware, and the software-as-a-service layer, Microsoft 365 above all, is where email and files now belong. Their weakness is steady workloads. A server that runs the same accounting system at the same load every day costs more in Azure than on dedicated hardware, often by a wide margin once storage and data transfer are counted, and the bill is hard to predict. Our article on whether moving to the cloud is a good idea covers that trade-off, and how to retire your server and move to the cloud is the plan for the parts that should go.
Private cloud and hosting: pros and cons
Dedicated infrastructure gives a business a known location, a known price and an engineer who can walk to the rack. Steady, latency-sensitive and licence-bound systems, a line-of-business database, a legacy application, a large file set, are usually cheaper here and always more predictable. Regulated businesses can say exactly where their data is. The cost is that capacity is planned rather than instant, and hardware in your own closet needs power, cooling and someone watching it, which is why many businesses move that hardware to a provider’s data center instead. Our server hosting and colocation page describes that arrangement in our own Minneapolis facility, and the three types of servers explains the options.
Hybrid: pros and cons
Hybrid puts each workload where it fits, and for most small and mid-sized businesses that is the honest answer. Email, files and collaboration in Microsoft 365; the application that needs a Windows server on private or hosted infrastructure; a public-facing web application or a burst of computing in a public cloud. The advantages are real: lower total cost than forcing everything into one model, a better disaster-recovery story because systems are spread across locations, and a path to the cloud that does not require replacing every application at once.
The disadvantages are about management rather than technology. Two or three environments mean two or three sets of tools unless someone unifies them; identity has to work across all of them or people end up with three passwords; security controls applied in one place get forgotten in another; and traffic between environments adds latency and, in the public cloud, cost. Hybrid works when one team is responsible for the whole arrangement and the seams are designed on purpose.
What hybrid looks like for a 30-person firm
A typical client of ours in professional services runs Microsoft 365 for email, files and Teams; a practice-management application with its SQL database on a hosted Windows server in our data center; QuickBooks in the vendor’s cloud; and a small web application for clients on Azure. Everyone signs in with one Microsoft Entra ID account, laptops are managed by Intune, a site-to-site connection joins the office to the hosted server, one monitoring system watches all of it, and one backup plan covers the tenant, the hosted server and the Azure application. The office itself has no server at all. The only thing that makes this hybrid rather than complicated is that it was designed as one system.
How to decide
- List the workloads, not the servers: email, files, each application, each database, anything public-facing.
- Put email and files in Microsoft 365 unless there is a specific reason not to. That decision is made.
- For each application, ask the vendor whether a cloud edition exists. If it does and it is mature, use it.
- Put what remains on dedicated hardware: steady, latency-sensitive, licence-bound or large. In your office only if the office can house it properly; otherwise hosted.
- Use public cloud for what is elastic or global, and for new things you are not sure about yet.
- Design the seams: one identity, one network plan, one monitoring system, one backup plan, one provider responsible.
Whatever the mix, the security work is the same and sits with you rather than the provider; our article on cloud security risks and how to mitigate them covers it. Our cloud support services and cloud migration services handle the design and the moves, and the pricing calculator gives a monthly figure for supporting the result.
Free tools from OAC Technology
- Managed services pricing calculator: a monthly figure for managed IT, in about a minute
- Cloud backup pricing calculator: a monthly figure for server and Microsoft 365 backups
- IT glossary: the terms in this article, explained plainly
Common questions
What is the difference between private cloud and hosting?
Very little in practice. A private cloud is dedicated infrastructure, run by you or by a provider, that only your business uses, usually with virtual machines you can add and remove. Hosting or colocation is the same idea with your own hardware in a provider’s data center. Both give you a known location, a known price and a phone number that reaches an engineer.
Is hybrid cloud more expensive?
It can be cheaper, because each workload goes where it costs least: steady systems on dedicated hardware, elastic ones in the public cloud, email and files in Microsoft 365. What costs more is running it badly, with two sets of tools, no shared identity and nobody responsible for the seams. That is a management problem, not a pricing one.
Which is most secure?
None by design. The public cloud providers run excellent data centres, private infrastructure gives you control over location and access, and hybrid inherits both. Security comes from identity, devices, configuration and monitoring, which apply equally to all three. The practical risk in hybrid is inconsistency: a control applied in one place and forgotten in another.
Can we start hybrid and move fully to the cloud later?
Yes, and most businesses do it in that order. Email and files go first, applications follow as vendors release cloud editions, and the last server is retired when the last application no longer needs it. Hybrid is usually a stage rather than a destination.
Does hybrid need special staff?
It needs someone responsible for the whole arrangement, which for a small business is usually a managed provider. The tools are mainstream: Microsoft Entra ID for identity across everything, a site-to-site connection between locations, one monitoring system and one backup plan.
Which cloud is Microsoft 365?
Public cloud, software as a service. It is the most common piece of a small business’s cloud, and it fits alongside private or hosted servers naturally, since the same Microsoft identity signs into both.
Talk to us
If you are not sure which of your systems belong in the public cloud, on a hosted server or in your office, we will look at what you run and give you a destination and a price for each. Call 952-548-5558 or contact us; the first conversation is free and there is no long-term contract.
