For years, the question “public cloud or private cloud” was framed as if it were an ideological debate. Today, for an SME, it’s an operational question with a clear answer: it depends on the type of data, the usage pattern and how predictable you need your monthly IT bill to be.
Understanding the real differences — not the ones sold by the sales reps on either side — saves you money and surprises.
The actual differences between the two models
The distinction is usually simplified to “public = shared, private = yours”. The reality has more nuance.
- Public cloud: infrastructure run by a provider (AWS, Azure, Google Cloud, OVH…) where your resources sit alongside many other customers’. You pay per use and scale on demand.
- Private cloud: infrastructure dedicated exclusively to your business. It can be in your offices, in your own data centre or on reserved servers at a provider that doesn’t share with third parties.
- Hybrid cloud: a combination of the two. Critical data and predictable workloads on private; one-off spikes or non-sensitive services on public.
The decision is rarely “all on one or all on the other”. Most mature companies operate hybrid without calling it that.
The real advantages of public cloud
Without the marketing mythology: what it actually delivers.
On-demand elasticity
You need 100 servers for three hours during a financial close and then zero: the public cloud responds in minutes. For highly variable, unpredictable workloads, there is no comparable alternative.
A huge catalogue of managed services
Databases, queues, streaming, AI, monitoring — all available as ready-to-go services. For technical teams that want to focus on product rather than infrastructure, that’s pure productivity.
Zero-CAPEX entry
Getting started costs nothing. No hardware to buy, no long contracts to sign. For prototypes, early-stage startups or experiments, that low barrier is real.
Global availability
Regions on multiple continents, integrated CDN, automatic failover. For companies with truly global operations, building this on private infrastructure is expensive.
The hidden costs of public cloud
What doesn’t appear in the marketing brochures:
- The bill grows non-linearly. Something that starts at €200/month can hit €2,000/month two years later with only minor usage changes. Egress costs (data leaving the cloud) are particularly notorious for surprising people.
- Subtle but real vendor lock-in. Every managed service you adopt ties you a little tighter: migrating a database between providers is feasible; migrating an architecture built on 15 native services is a months-long project.
- Jurisdiction outside your control. Even if the data physically sits in Frankfurt, if the provider is American, the CLOUD Act applies. This isn’t theoretical: it has concrete implications for GDPR compliance and is one of the central arguments in the article on digital sovereignty.
- Shared performance. Your resources sit alongside others’. For most workloads it doesn’t matter; for critical or predictable ones, it does.
- Unilateral moderation and suspension. Some providers have suspended accounts without notice over perceived terms-of-service violations. If that happens during business hours, your operations stop.
The real advantages of private cloud
It’s not all sentimentality about having servers “at home”. Measurable advantages:
- Predictable cost: a single fixed fee for dedicated infrastructure. What you pay in January is what you pay in December. For CFOs who hate surprises, that’s gold.
- Guaranteed performance: the resources are only yours. No noisy neighbours, no invisible throttling, no hour-of-day variation.
- Sovereignty and compliance: you choose the jurisdiction. For regulated sectors (healthcare, banking, legal, public sector, businesses with industrial secrets), this dramatically simplifies compliance.
- No egress costs: moving your own data within your own infrastructure costs nothing. In public cloud, taking out a TB can cost hundreds of euros.
- Real control of the stack: you decide versions, updates and configurations. No provider forcing a change on you when it doesn’t suit.
- Native integration with the rest of your IT: if you also consolidate ERP, email and other services on the same infrastructure (in line with our philosophy of IT vendor consolidation), the ROI multiplies.
Private cloud isn’t a 2000s data centre
Anyone still picturing “private cloud” as a basement full of humming servers is working from a 15-year-old image. Modern private cloud is built on open-source technologies like Proxmox for virtualisation, Nextcloud for storage and collaboration, and OPNsense for perimeter security.
The result: dedicated infrastructure with the capabilities of a public cloud (APIs, automation, orchestration), under your control, without per-user licences and with hardware amortised over 3–5 years.
In NEXCORE, our dedicated IT infrastructure platform, we combine these components so your business runs a private cloud without having to build and maintain the technical complexity. You use; we operate.
When private cloud becomes even more compelling
Three scenarios sharpen the case for private cloud:
- When you add AI. AI models running on your own infrastructure prevent the wholesale handover of sensitive data that any commercial API implies. We cover this in detail in the article on enterprise AI without handing over your data.
- When integrating with ERP and internal management. A modular ERP like NEXERP running on dedicated infrastructure removes latency, egress costs and operational complexity.
- When migrating from proprietary suites. If your company plans to leave Microsoft 365 for an open-source collaboration platform, private cloud is the natural framework to host it.
How to decide for your SME
A practical decision matrix:
- If your data is sensitive or regulated: private cloud for that data, always. Compliance complexity in public almost never pays off.
- If your workload is predictable and continuous: private. The 3-year TCO is usually 30–50% lower.
- If your workload is highly variable and unpredictable: public or hybrid. That’s where elasticity actually pays.
- If you operate in the EU and want straightforward compliance: European private or public with a 100% European provider.
- If you value full control of stack and data: private. There’s no substitute.
- If your team lacks operational capacity: private cloud managed by a third party (still dedicated to you). Best of both worlds.
Common mistakes in the choice
The usual missteps when deciding between public and private cloud:
- Choosing by sector default. If your competitors use X, that doesn’t mean it’s right for you. Your operations are different.
- Underestimating 3–5-year cost. The current monthly price doesn’t predict the price in two years on public. A serious TCO looks at the long horizon.
- Forgetting the human factor. Private cloud without a team to maintain it is worse than public. If you don’t have internal capacity, you need a managed partner.
- Mixing without criteria. Well-thought-out hybrid works. Improvised hybrid is complexity without benefit.
Frequently asked questions
Can I start on public cloud and migrate to private later if usage grows?
You can, but the migration cost isn’t trivial if you’ve adopted provider-specific managed services. For basic workloads (VMs, storage, standard databases) migration is reasonable. For architectures built on hyperscaler-native services (Lambda, Cosmos DB, BigQuery…), it can become a major project. Better to decide the model thinking 3–5 years ahead, not just the first quarter.
Is it true that private cloud is more secure?
Not by definition. A well-configured public environment is more secure than a poorly operated private one. The real security advantage of private is a smaller attack surface (you don’t share a hypervisor with third parties) and full control of configuration — not automatic immunity.
What’s the cost crossover where private beats public?
Highly variable by provider and workload. For stable workloads with sustained 24/7 use, the crossover is typically around €600–1,500/month of equivalent public spend. Above that, a private cloud on owned or dedicated hardware is usually significantly cheaper over three years.
What about GDPR compliance on a European public cloud?
Formal compliance is achievable, but it requires constant documentary diligence: checking the physical location of each service, validating the data-processor agreement, justifying international transfers if any, and keeping the records of processing activities current. A European private cloud simplifies all of that because there are no international transfers and no intermediate data processors.
Can I have a private cloud without maintaining physical servers?
Yes. “Private cloud” doesn’t require hardware in your offices. It can be hardware dedicated to you in an external data centre, with the partner handling operation, backups, updates and perimeter security. You use; the partner operates. It’s the most cost-effective model for most SMEs.
How long does it take to migrate from public to private?
For a typical SME, 3–6 months from planning to full operation. It depends on the number of services and integration complexity. The key is to migrate in phases, not all at once.
Conclusion
The choice between public and private cloud isn’t a dogmatic decision. It’s an equation with three variables: data sensitivity, workload pattern and the predictability you want. For most SMEs with stable operations and sensitive data, a well-designed private cloud is the more cost-effective option and the one that brings the most peace of mind over the medium term.
Hybrid is a valid option when the two parts are clearly delimited. What doesn’t work is staying on public by default because “that’s what everyone does”: that’s not a strategy, it’s a refusal to decide.
Want us to compare the real cost of your current infrastructure against a dedicated private cloud? Get in touch and we’ll send you a grounded proposal.
