How do I build my first NAS?

Decide between a prebuilt unit and a DIY build, pick large NAS or enterprise hard drives at the best price per TB, choose a redundancy level so a drive can fail safely, and add an offsite backup. Start simple, and you can expand later as your needs grow.

What do I need for a home NAS?

Either a prebuilt NAS or a basic PC with enough drive bays, a few large hard drives, and free software like TrueNAS or Unraid if you go DIY. Then redundancy for safety and a backup. The live table shows the best value drives to fill it.

Is building a NAS hard for a beginner?

Less than you might fear. A prebuilt unit is almost plug-and-play, and even a DIY build is just a basic PC with friendly software doing the hard work. Take it one step at a time and your first NAS is an afternoon project.

How to Build Your First NAS: A Beginner's Guide

Published: 28 août 2026

Live comparison · Amazon.com

Pulling live prices…

📊 As of August 29, 2026, SATA 3.5″ averages $49.47/TB vs $43.05/TB for SAS 3.5″ on Amazon.com — SAS 3.5″ is about 13% cheaper per TB.

Sourced from real discussions on r/homelab, r/synology and r/DataHoarder, cross-checked against live PricePerGig listings.

If you’re just starting out on your data storage journey, you may be thinking you need to spend a lot on a pre-made NAS. You don’t have to. Take a breath, because it is far more approachable than the homelab forums make it look.

A NAS is just storage that lives on your network, always on, shared, and protected by redundancy. Here is how to get there, step by step.

The table above compares the live price per TB on your marketplace for the drives that will fill it, which are the biggest part of the cost.

Step 1: DIY or prebuilt?

Your first big fork in the road.

A prebuilt unit arrives ready, with polished software and almost no setup. A DIY build is cheaper and more flexible, using free software on basic hardware.

Neither is wrong. We weigh it up fully in DIY NAS vs Synology. Beginners who want it to just work often start with a prebuilt, then go DIY later once hooked.

Step 2: Pick your drives

The heart of the NAS, and where most of your money goes.

Buy large NAS or enterprise hard drives at the best price per TB. Bigger drives, fewer of them, is the smart move, and your electricity bill agrees: 4 smaller old drives use 4x more power than 1 larger drive, so it’s usually worth buying the bigger drive. We break the running costs down in how much power does a hard drive use.

Check the interface while you shop, too. SAS drives are often much cheaper per TB than SATA, thanks to the flood of enterprise drives on the market. The table above compares SATA and SAS prices live. Just know that a DIY build needs an inexpensive HBA card to connect SAS drives, while most prebuilt units take SATA only.

We cover the choice in the best drives for a NAS and enterprise vs consumer drives.

Sort the live table above by price per TB and pick the value sweet spot.

Step 3: Choose your redundancy

This is what makes a NAS safe.

Redundancy lets a drive fail without losing data. For most home builds, a level that survives two failures is the sweet spot. We explain the options in how many drives can you lose and how many to buy in how many drives for a RAID array.

Step 4: Pick a file system

Less scary than it sounds.

For data integrity and snapshots, ZFS is the popular choice, with Btrfs a strong alternative. See the best file system for a NAS. A prebuilt unit usually chooses for you.

Step 5: Back it up

The step that turns a NAS into real safety.

Remember, redundancy is not a backup. A NAS protects against drive failure, not deletion, ransomware or fire. So keep an offsite copy of anything irreplaceable. We explain why in is RAID a backup.

The bottom line

Building your first NAS is five simple steps: choose DIY or prebuilt, pick large drives at the best price per TB, set a redundancy level, choose a file system, and add an offsite backup.

Start simple and expand later. Use the live price per TB table above to buy your drives affordably, follow the steps in order, and you will have a proper home NAS up and running sooner than you think. Welcome to the homelab.