Proxmox VE vs public cloud: the TCO calculation

“The cloud is simpler and you only pay for what you use.” That argument is true for some workloads and false for many others. Comparing Proxmox VE with AWS, Azure or GCP is not about the hourly rate on the page, it is about total cost of ownership (TCO) over time. Here is how to set up the calculation honestly, and where each option wins.

Why the cloud bill surprises

The pay-as-you-go model is ideal for elastic workloads: occasional spikes, ephemeral environments, global audiences. It becomes expensive as soon as the load is steady and permanent. A VM running 24/7 all year never benefits from elasticity: you pay continuously for a pricing model built around flexibility you are not using.

Then come the costs everyone forgets at quote time:

• Egress: getting your data out of the cloud is billed, sometimes heavily. It is the line item that wrecks backup and replication budgets.
• Managed services: databases, load balancers, object storage are convenient but carry a markup.
• Over-provisioning: you size large “just in case”, and the bill follows.

What a real TCO must contain

An honest calculation puts both columns on the same basis, over 3 years.

Public cloud side: compute (on-demand or reserved), storage, egress and bandwidth, snapshots and backup, support plan, and the human cost of FinOps (tracking and optimising the bill is a job).

Proxmox VE side: amortised hardware (or a monthly fee if managed), the per-socket subscription (Proxmox VE is open source, but a serious production setup needs a per-socket subscription that funds development and provides the stable enterprise repository and support), hosting or managed operations, and running the platform (in-house or outsourced).

Putting these lines side by side is what reveals the real gap, not one instance price versus one server.

The crossover point

The rule is simple to state:

• Steady, predictable workloads (ERP, line-of-business apps, production VMs always on): Proxmox VE is almost always cheaper over 3 years, because you stop renting at elasticity prices a capacity you use continuously.
• Truly elastic workloads (seasonal peaks, occasional batch jobs, global multi-region presence): the public cloud keeps the edge, because you only pay for the peaks.

Most SMB and mid-market infrastructure is steady by nature. That is exactly the profile where the public cloud costs the most for no matching benefit.

Hidden costs on both sides

To avoid fooling yourself, the TCO must also include what we instinctively downplay. On the cloud side: egress, over-provisioning, and managed-service drift over time. On the Proxmox side: designing redundancy and high availability, tested backup, and the expertise or hours coverage to run the platform.

Proxmox VE is not “free”: there is hardware, a subscription and operations. Its advantage is not the absence of cost, it is a predictable cost, with no per-VM or per-gigabyte-out meter.

Where it gets concrete

The right move is to price your real case rather than reason at unit rates. Our pricing is deliberately readable and predictable (per VM, per TB), so you can put it next to your current cloud bill. And our Proxmox VE vs public cloud comparison details where the gap widens. The goal is not to flee the cloud on principle, but to put each workload where it costs the least for what it delivers.