What is a NAS? A NAS (Network Attached Storage) is a dedicated device connected to your home network that stores and serves files. Unlike a standard external hard drive that plugs into one computer, a NAS can be accessed wirelessly by multiple devices, smartphones, and smart TVs simultaneously.
If you are just starting your data hoarding journey, you will quickly realize that storing everything on your computer’s internal hard drive is a bad idea.
Eventually, you will run out of space, and if that drive fails, all your data is lost forever. This is where a NAS comes in.
A NAS is the central hub of any serious digital archive and the piece of hardware most homelabs are built around. It allows you to safely store terabytes of data, back up your family photos, and even run your own personal media server. In this guide, we will explain exactly what a NAS is, why you need one, which operating system and file system to run on it, and the best hardware to get started.
How Does a NAS Work?
A NAS is essentially a miniature computer built specifically for storing files.
It consists of an “enclosure” (the physical box) that contains a basic processor, RAM, and several slots (called “bays”) for hard drives.
Instead of plugging into your computer via a USB cable, a NAS plugs directly into your home internet router using an Ethernet cable. Once connected, the NAS broadcasts its storage space over your Wi-Fi network.
Any device connected to your Wi-Fi—your laptop, your phone, your smart TV—can access the files stored on the NAS just like it was a local folder on the device itself.
The Top 3 Benefits of Owning a NAS
1. Data Protection and RAID
If you buy a standard external hard drive and it breaks, your data is gone. A NAS protects against this using a technology called RAID (Redundant Array of Independent Disks).
If you buy a 2-bay NAS and insert two 4TB hard drives, the NAS will automatically mirror your data across both drives. If one drive completely dies, you do not lose a single file. You simply pull the broken drive out, insert a new one, and the NAS rebuilds itself.
2. Centralized Backups
Instead of buying a separate external hard drive for your desktop, your spouse’s laptop, and your phones, a NAS centralizes everything. You can set up automatic backups so that every time you walk into your house, your phone automatically backs up its new photos directly to the NAS.
3. Running a Home Media Server (Plex)
This is the most popular use for a NAS among data hoarders. Modern NAS devices are powerful enough to run applications like Plex Media Server.
You can use Usenet newsreaders to retrieve posts and articles directly to the NAS. Plex will then organize those files into a beautiful interface and stream them directly to your smart TV, Roku, or Apple TV. It is like having your own personal, private streaming service. If you are ready to build one, check out our guide to the best Plex servers.
NAS vs. Remote Server: Which Do You Need?
If you are considering renting a remote server instead of buying physical hardware, here is a quick comparison to help you decide. If you are weighing a simpler direct-attached option instead, see our DAS vs NAS comparison for how the two actually differ.
- Choose a Remote Server if: You prefer not to manage physical hardware at home and are comfortable paying monthly rental fees for remote server access.
- Choose a NAS if: You want total physical control over your data, you want to store personal files (like family photos), and you want a massive, one-time storage purchase without paying monthly server rental fees.
Choosing A NAS Operating System
The operating system running on your NAS matters just as much as the hardware inside it. It determines how easy the box is to manage, which apps you can install, and how much control you have over storage and file systems.
Synology And QNAP: Turnkey Simplicity
Synology and QNAP sell a complete package: proprietary hardware paired with a polished, browser-based operating system that handles RAID, backups, and app installation through a simple interface. For most beginners, this is still the easiest way into NAS ownership. See our full Synology vs QNAP comparison for how the two brands actually differ on software, app support, and pricing.
Unraid, TrueNAS, And Proxmox: DIY Flexibility
If you build your own NAS from off-the-shelf PC parts instead of buying a Synology or QNAP box, you will need to choose a free operating system to run it. Unraid, TrueNAS SCALE, and Proxmox are the three most common choices among homelab builders, and each takes a different approach to storage flexibility, virtualization, and container support. Our Unraid vs TrueNAS comparison and Proxmox vs TrueNAS SCALE vs Unraid breakdown walk through which one fits a storage-first build versus a virtualization-first build.
The Best NAS Hardware for Beginners
Building a NAS requires two separate purchases: the enclosure (the brains of the operation) and the hard drives (the storage).
1. The Best NAS Enclosure: Synology
Synology is the undisputed king of the home NAS market. Their operating system (DiskStation Manager) is incredibly easy to use and looks just like a normal Windows desktop in your web browser.
For beginners looking to back up files and run a basic media server, you want a “2-Bay” NAS (meaning it holds two hard drives). If your archive is going to grow past what two drives can hold, it’s worth comparing enclosure sizes before you buy. Our best NAS case roundup and our 4-bay vs 8-bay NAS guide cover when it makes sense to size up from the start instead of upgrading later.
- Best Budget Option: Synology 2-Bay DiskStation DS223
- Best for Plex Streaming: Synology 2-Bay DiskStation DS225+ (The “+” models have upgraded processors that handle video streaming much better).
If you are on a very tight budget and love DIY projects, you can also build a Raspberry Pi NAS for a fraction of the cost, or skip the enclosure decision entirely and see our picks for the best pre-built home NAS devices.
2. The Best NAS Hard Drives: Seagate IronWolf
You cannot use standard desktop hard drives in a NAS. Because a NAS runs 24/7, standard drives will quickly burn out and fail.
You must use drives specifically engineered for NAS environments. These drives have vibration sensors and firmware designed for continuous operation. The industry standard for NAS storage is the Seagate IronWolf series, though WD Red Plus is a close competitor worth comparing on price and warranty.
- Best Starter Drive: Seagate IronWolf 4TB NAS Internal Hard Drive
- Best for Data Hoarders: Seagate IronWolf 12TB NAS Internal Hard Drive
(Remember: If you buy a 2-bay Synology enclosure, you need to buy TWO identical hard drives to ensure your data is properly mirrored and protected!) If new NAS drives are stretching your budget, our hard drive shucking guide covers how to pull NAS-grade drives out of cheaper external enclosures for a fraction of the retail price.
File Systems And Storage Pools
The file system your NAS uses underneath its RAID array determines how well it can detect and repair silent data corruption, called bit rot, and how flexible your storage pool is as you add drives over time. This matters more for a large archive than most beginners expect. Our ZFS vs Btrfs comparison breaks down which file system fits a storage-first NAS build versus a more general-purpose homelab server.
If you are building an Unraid box specifically, pairing your storage pool with an NVMe cache drive can make a significant difference in write speed and drive spin-down behavior. Our Unraid ZFS hybrid pools and NVMe cache guide covers how to set this up correctly.
Protecting Your NAS: Power And Network
A NAS holding your only copy of years of archived data is only as reliable as the power and network it depends on. A dirty power cycle during a write operation is one of the more common ways RAID arrays get corrupted, and a NAS that drops off the network mid-transfer can leave files in a half-written state.
A UPS (uninterruptible power supply) gives your NAS enough runtime to shut down cleanly during an outage instead of losing power mid-write. See our APC vs CyberPower UPS comparison for which models pair well with a home NAS. On the networking side, if you are running Plex or moving large files between a NAS and multiple devices, your router can become the bottleneck — our best router for NAS and Plex guide covers which upgrades are actually worth it.