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DIY NAS

Best NAS Operating Systems for 2025

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.

NAS OS Overview

A NAS operating system is basically what transforms your regular PC into a full-fledged network storage server. In 2025, the top contenders are TrueNAS, Unraid, OpenMediaVault, and FreeNAS. These OSes handle different file systems, RAID setups, and network protocols. They also let you manage backups, access your files remotely, and even run virtual machines or Docker apps.

When choosing a NAS OS, consider:

  • Hardware compatibility – Make sure your old PC or laptop is supported.
  • Data protection – RAID or ZFS is key for keeping your files safe.
  • Ease of use – A clean interface makes setup and maintenance easier.
  • Expandability – Think plugins, Docker, or VM support.

TrueNAS

TrueNAS is a go-to for anyone who wants a solid, reliable NAS. It’s FreeBSD-based and uses ZFS, giving you snapshots, storage pools, and top-notch data protection.

Why it rocks:

  • ZFS ensures your data stays safe.
  • Supports encryption, replication, and backups.
  • Plenty of plugins for media servers, cloud storage, and VMs.

Who it’s for:

  • DIYers converting an old PC into a serious NAS.
  • Small offices or home labs that need enterprise-level reliability.

Pro tip: TrueNAS has a steeper learning curve and higher hardware needs, but once you get it running, it’s rock-solid.

Unraid

Unraid is all about flexibility. Unlike traditional RAID, you can mix and match drives of different sizes, making expansion super easy.

Why it rocks:

  • Simple web interface for setup and management.
  • Docker and VM support lets you run apps and experiment.
  • Parity-based storage is flexible and beginner-friendly.

Who it’s for:

  • Media enthusiasts who want a NAS + Plex or Emby server.
  • DIYers who want to run apps in Docker or lightweight VMs.

Pro tip: Unraid isn’t as strong as ZFS for data integrity, but it’s easy to grow your storage over time.

OpenMediaVault

OpenMediaVault (OMV) is a Debian-based NAS OS, perfect if you want something free, lightweight, and easy to configure.

Why it rocks:

  • Simple OpenMediaVault setup via web GUI.
  • Supports RAID, SMB/NFS, FTP, and Docker.
  • Tons of plugins for media, backups, and monitoring.

Who it’s for:

  • Beginners or hobbyists converting old PCs into home NAS.
  • Anyone who wants lightweight software without losing functionality.

Pro tip: OMV may lack some enterprise-level features, but it’s ideal for a small home NAS or DIY media server.

FreeNAS

FreeNAS is the classic predecessor to TrueNAS Core, still popular for learning and legacy systems. It also uses ZFS, so your data is protected.

Why it rocks:

  • ZFS-based storage and snapshots.
  • Built-in support for SMB, AFP, NFS, and other protocols.
  • Plenty of FreeNAS tutorial guides online for setup tips.

Who it’s for:

  • Learners and DIY enthusiasts who want to explore NAS features.
  • Home labs or smaller storage setups with older hardware.

Pro tip: FreeNAS’s interface isn’t as modern as TrueNAS Core, but it’s still solid for learning and small projects.

Recommendations

Here’s a quick rundown for 2025:

  • TrueNAS – Best for enterprise-grade reliability and serious DIY NAS builds.
  • Unraid – Great for media servers, Docker, and flexible storage expansion.
  • OpenMediaVault – Perfect for beginners and lightweight home NAS projects.
  • FreeNAS – Ideal for learning NAS management or legacy hardware setups.

No matter which OS you pick, each has its strengths. With the right NAS operating system, your DIY NAS will be reliable, expandable, and fun to play with.