Private Cloud vs Public Cloud: A Realistic TCO Comparison for 2025
The Private Cloud Renaissance
After years of "cloud first" mandates, some enterprises are bringing workloads back from public cloud. High-profile "cloud repatriation" stories from Basecamp, Dropbox, and others have sparked renewed interest in private cloud economics. Let's examine the reality.
Private Cloud Platform Costs
VMware (Broadcom) on Dedicated Hardware
| Component | Annual Cost |
|---|---|
| VMware vSphere Enterprise Plus licences (100 VMs) | $80,000-120,000 |
| VMware vSAN (100TB) | $50,000-80,000 |
| NSX-T networking | $40,000-60,000 |
| vRealize Operations | $20,000-30,000 |
| VMware stack total | $190,000-290,000/year |
Note: Post-Broadcom acquisition, VMware licensing has shifted to subscription-only with significant price increases (2-5×) for existing customers. This changes the economics significantly.
OpenStack / Open Source Private Cloud
- Software cost: Near-zero (open source)
- Staff cost: 3-5 engineers to maintain ($400,000-700,000/year)
- Hardware: Amortised over 5 years
- Support contract (Red Hat, Canonical): $50,000-150,000/year
5-Year TCO: 200-Server Equivalent
| Category | Private (VMware) | AWS (3yr RI) | OCI |
|---|---|---|---|
| Hardware (5yr) | $2,000,000 | — | — |
| Software licences | $1,250,000 | — | — |
| Compute cost | — | $2,100,000 | $720,000 |
| Facilities (5yr) | $1,500,000 | — | — |
| Personnel (infra ops) | $1,500,000 | $800,000 | $800,000 |
| Networking/egress | $250,000 | $900,000 | $90,000 |
| 5yr Total | $6,500,000 | $3,800,000 | $1,610,000 |
When Private Cloud Might Win
- Very stable, high-utilisation compute: 90%+ server utilisation, completely predictable workloads — private hardware can be competitive
- Extreme data gravity: Petabytes of data that can't be economically moved to cloud
- Strict data residency: Some jurisdictions require data to physically remain on-premises
- Heavily regulated, air-gapped: Defence/intelligence scenarios where public cloud is prohibited
The Cloud Repatriation Reality
Most cloud repatriation stories involve very specific workloads: typically large-scale, stable compute with predictable patterns and high bandwidth requirements. They rarely represent a full workload portfolio return.
Basecamp famously saved $3.2M/year by moving from cloud — but they run one of the world's most predictable SaaS applications with minimal variance in load. This is exceptional, not typical.
Private cloud can win on pure infrastructure cost for highly utilised, completely predictable workloads at scale. For most enterprises with variable demand and evolving requirements, public cloud (especially OCI for cost-sensitive scenarios) remains economically superior when total TCO is calculated honestly.
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