Lately, there's a buzz in the tech world. A murmur heard in forums, LinkedIn groups, and even team meetings. For the last ten or fifteen years, the default answer to any infrastructure problem was, almost dogmatically, "the cloud." Need a database? AWS RDS. A web server? Azure App Service. Storage? Google Cloud Storage.

It was the promise of infinite agility. Pay only for what you use, scale with a click, and forget about whether a hard drive was making strange noises at 3 AM.

And yet, here we are, in the middle of 2025, and I keep seeing system administrators dusting off racks, startups calculating the cost of buying their own servers, and a whole host of enthusiasts (the homelab phenomenon on Reddit is fascinating) setting up Proxmox clusters on mini-PCs that fit in the palm of your hand.

What happened? Is it just a nostalgic trend, like vinyl, or are we witnessing a necessary course correction? The reality, as always, is a hybrid.

The Promise (and the Hangover) of the Public Cloud

To understand why "bare metal" (physical hardware) is making a comeback, we first need to be fair to the cloud. The public cloud (AWS, Azure, Google Cloud) changed the rules of the game.

Before, if a company in Seville, like the many we work with, wanted to launch a new application, the process was slow and expensive. You had to buy servers (CapEx or capital expenditure), wait for them to arrive, install them, configure them... a process of weeks or months.

The cloud turned it into OpEx (operating expense). Need power? Pull out your credit card, and in five minutes you have a server in Virginia, Frankfurt, or Singapore. This enabled the birth of phenomena like Netflix, Spotify, or the very fabric of startups as we know them. The cloud is elastic, it's (relatively) easy to manage, and its "managed" services (like databases or AI services) take a load of work off your plate that doesn't add direct value to your business.

The problem is that, like any good party, the bill comes afterward. And the cloud bill, sometimes, is a monumental hangover.

The "Wake-up Call" of the Unexpected Bill

The first reason companies are re-evaluating their cloud strategy is cost.

The "pay-for-what-you-use" model is fantastic when you start, but it's terribly difficult to predict when you grow. The real silent villain of the cloud isn't so much compute or storage (which are relatively cheap), but the egress fees (outbound traffic).

Imagine this: you store 10 TB of data on S3 (AWS). Storing it costs you a reasonable amount. But if you suddenly need to get those 10 TB out to analyze them elsewhere or serve them to your customers, the data transfer bill can be, literally, thousands of euros. It's the toll for leaving the ecosystem.

Companies that started with a €500 monthly bill suddenly see it skyrocket to €5,000 or €15,000 without a proportional increase in their revenue. When a workload is predictable and constant (for example, a database that runs 24/7), the cloud's pay-per-use model almost always ends up being more expensive than having your own server dedicated to that task.

The famous data repatriation by 37signals (creators of Basecamp), saving millions by leaving the cloud, was a warning shot. Now, many are doing the same math.

The Rebirth of "Self-Hosted" is Not a Return to the Past

This is where self-hosting comes in. But let's not be mistaken. We're not talking about going back to having an old Pentium IV in a corner of the office gathering dust.

The self-hosting of 2025 is technologically very sophisticated. It's the "private cloud" done right.

Thanks to incredibly mature open-source tools, today you can set up an infrastructure that rivals the public cloud in flexibility, but on your own hardware.

• Virtualization and Containers: Proxmox has become the undisputed king for SMEs and enthusiasts. It's a free and powerful "VMware ESXi." On top of it, Docker and Kubernetes (or their lightweight versions like K3s) allow you to manage applications in the same way you would in the cloud.
• Accessible Hardware: You no longer need to buy an expensive brand-name server. A cluster of three or four mini-PCs (Intel NUC, Beelink, etc.) gives you impressive high availability for a fraction of the cost.
• Control: And this is the key point. When the server is yours, you know exactly where your data is. There's no vendor lock-in (if you use a proprietary database from a cloud provider, you're tied to them). If you need to get 10 TB of data out, the only cost is your internet connection, not a per-gigabyte toll.

For an enthusiast, this means controlling their privacy by running Nextcloud (an alternative to Google Drive/Photos) or their own password manager (Vaultwarden).

For a business, it means having predictable costs. You know the hardware costs you X, and the electricity costs you Y. The end. No surprises at the end of the month because a developer accidentally left a virtual machine running.

Self-Hosted or Cloud? The Question is Wrong

At this point, it might seem like I'm advocating for a mass exodus from the cloud. Nothing could be further from the truth. Abandoning the cloud completely is as bad an idea as "moving everything up" without thinking was.

The real debate isn't "Cloud vs. Self-Hosted." It's "Which workloads go where?"

The smart solution, the one we see succeeding in digitally maturing companies, is the Hybrid Cloud.

The Hybrid Cloud is nothing more than using common sense: take the best of both worlds.

What does this look like in practice?

1. What stays "at home" (Self-Hosted/On-premise):
   • Predictable and heavy workloads: That 2TB database that is constantly queried. It's much cheaper to have it on its own server (physical or virtualized).
   • Sensitive data and primary backups: Customer data, billing, the ERP. For compliance (GDPR) and security, it's better to have them in your own controlled infrastructure.
   • Massive storage: If you handle large volumes of video, images, or files (like a marketing agency or an architecture studio), the cost of cloud storage and traffic is prohibitive. A good NAS (like those from Synology or one built with TrueNAS) is unbeatable.
2. What goes to the Cloud:
   • Elasticity and demand spikes: Your e-commerce website during Black Friday. You need to be able to scale from 1 server to 50 in minutes and back to 1 afterward. Only the cloud can give you that.
   • SaaS Services: Email. No one in their right mind should manage their own email server today. That's what Microsoft 365 and Google Workspace are for.
   • Disaster Recovery: Your primary backup can be local, but the backup of the backup must be off-site. Using a "cold" storage service in the cloud (like AWS Glacier or Backblaze B2) for this is cheap and can save your business.

The Pendulum of Technology

What we're experiencing is not the end of the cloud, but the end of the "honeymoon" with the cloud.

Technology moves like a pendulum. We went from centralized mainframes to decentralized PCs. Then we re-centralized everything in the cloud. Now, the pendulum is starting to swing back to a middle ground: a smart mix of local (self-hosted) and cloud resources.

The true skill of a good technology partner (and here we're patting ourselves on the back a bit at ForgeNEX) is no longer telling you to "move it to the cloud," but sitting down with you, looking at your bills, understanding your business, and telling you: "This, you can save on if you put it on this local server. And this other thing, leave it in the cloud, it gives you life."

In the end, it's all about control. Control over your data, over your privacy, and, above all, over your costs.