If you’re planning to turn an old PC into a NAS in 2025, picking the right operating system is step one. The OS you choose can make your DIY NAS run smoothly, keep your data safe, and even let you play with fun extras like media servers or Docker containers. In this guide, we’ll break down the best NAS operating systems for 2025, compare TrueNAS vs Unraid, show you how an OpenMediaVault setup works, and give some handy tips from FreeNAS tutorial experiences.

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Repurposing an old PC into a Network-Attached Storage (NAS) device is one of the most satisfying DIY projects for tech enthusiasts. Not only does it save you money, but it also gives your aging hardware a new purpose. Whether you have an old desktop or a laptop gathering dust, you can convert it into a reliable NAS for file storage, media streaming, and backups. In this guide, we’ll walk you through the process step by step.

Building your own NAS (Network Attached Storage) isn’t just about saving money or getting more performance — it’s about the joy of creation. There’s a deep satisfaction in taking an old PC or a few spare parts and transforming them into a smart, reliable data hub that quietly powers your digital life.

When you build your own NAS, you gain complete control — over the hardware, the operating system, the performance, and even the noise profile. No vendor lock-ins, no artificial limits. You decide how your data lives, moves, and grows.

Whether you want a personal cloud, a home media center, or a rock-solid backup solution, a DIY NAS gives you the freedom to design a system that perfectly fits your needs — and the fun of watching it come alive under your hands.

But before you start choosing components or installing an OS, it’s important to understand what NAS really is and why it’s such a powerful addition to any home or office setup.