Best DIY NAS Case/Kit for 2026

Choosing the right case for a DIY NAS in 2026

Building your own NAS remains one of the most rewarding homelab projects: you choose your CPU, your OS (TrueNAS, Unraid, OpenMediaVault), your drives, and you avoid the constraints of commercial NAS appliances. But it all starts with the case, as it determines how many 3.5” drives you can fit, what motherboard form factor you can use, and how quiet the machine will be.

In 2026, three families dominate the compact DIY NAS market: the Jonsbo N1/N2/N3, the Fractal Design Node 304/804, and the integrated Topton/CWWK kits based on the Intel N100. Let’s see how to choose.

How many 3.5” bays do you really need?

This is criterion number one. A 3.5” hard drive remains, in 2026, the best $/TB ratio for mass storage. The question isn’t “how many drives do I have today” but “how many will I need in three to five years.”

• 2 to 4 bays: sufficient for home use (backups, modest media library). An N100 kit does the job; the Jonsbo N1 (5 x 3.5” bays) leaves some headroom.
• 5 to 6 bays: the sweet spot for most homelabbers. Jonsbo N2, Fractal Node 304.
• 8 bays and up: for large volumes, comfortable RAID-Z2 setups, or archival. Jonsbo N3 or Fractal Node 804.

Planning too tightly is a classic mistake: you end up buying another case (and migrating everything) a year later. It’s better to have one or two extra bays.

ITX vs. mATX: Compactness vs. Expandability

Almost all compact NAS cases target Mini-ITX. It’s tiny, fits under a desk or in a ventilated cabinet, and the selection of ITX motherboards with multiple SATA ports is now decent.

The downside: an ITX motherboard has only one PCIe slot. If you want to add an HBA card (to multiply SATA ports) and a 10 GbE network card, you’re stuck. This is where the micro-ATX (mATX) of the Fractal Node 804 regains the advantage: two to four slots, more room for cabling, at the cost of a larger case.

Simple rule: ITX if you stick to integrated SATA and 2.5 GbE; mATX if you anticipate 10 GbE and/or a SATA expansion card.

Cooling and Silence: The War of Large Fans

A NAS runs 24/7, often in a living space. Silence is therefore not a luxury. The secret is well known: large fans spinning slowly move as much air as screaming small fans, but without the noise.

Jonsbo cases provide cooling in front of the drive bay (built-in 120 mm on the N2, 140 mm on the N1, 100 mm mounts on the N3 — see spec sheet) — essential, as drives are the hottest components in a NAS. The Fractal Node 304 is renowned for its silence thanks to its 92 mm and 140 mm fans, its dust filters, and its rigid structure. Regardless of your base, think about replacing any noisy original small fan with a high-quality, low-RPM model.

Also pay attention to drive spacing: bays that are too tight without dedicated airflow will cause temperatures to rise, reducing drive lifespan. On this point, choosing drives designed for NAS use also helps; see our guide best NAS hard drive 2026.

Power Supply: The SFX Trap

Here is a detail many forget when buying. Very dense ITX cases, like the Jonsbo N3, require a SFX power supply (smaller than standard ATX). However, a good SFX PSU costs more and is less readily available than an ATX one. This is a cost to factor into your budget from the start.

Conversely, the Fractal Node 304 accepts a standard ATX power supply: cheaper, more widespread, and easier to replace. For a beginner, this is a real comfort.

Also consider the number of SATA power connectors: eight drives mean eight connectors. Check that your power supply (or its modular cables) supports this, even if you have to use quality adapters.

Case / Kit	3.5” Bays	MB Format	PSU	Strengths
Jonsbo N1	5	Mini-ITX	SFX	Ultra-compact, discreet cube
Jonsbo N2	5	Mini-ITX	SFX	Good size/bay balance
Jonsbo N3	8	Mini-ITX	SFX	Maximum density, backplane
Fractal Node 304	6	Mini-ITX	ATX	Silence, standard PSU
Fractal Node 804	8-10	Micro-ATX	ATX	Expandable, large cooling
Topton/CWWK N100 Kit	4-6	Integrated	External/SFX	Plug-and-play, low power

Integrated N100 Kits: The No-Assembly Route

Apart from “empty” cases, a category is gaining strength: the Topton and CWWK NAS kits that already include an Intel N100 motherboard. You don’t buy a CPU or separate motherboard: the CPU is soldered and the whole is designed for storage, often featuring 2.5 GbE and multiple M.2 slots.

Their strengths: very low power consumption, minimal footprint, and assembly reduced to installing drives and the OS. Their limitations: little to no scalability (CPU not replaceable, RAM sometimes limited), and variable customer support depending on the seller. This is the ideal option for those who want an energy-efficient NAS right now, without assembling a full platform. If you’re still hesitating on the compute base, our comparison best homelab mini-PC 2026 sheds light on the debate between integrated cards and scalable platforms.

Our Final Recommendation

For a DIY NAS intended to last and accommodate many drives, the Jonsbo N3 and its 8 bays are our density pick — provided you accept the SFX power supply requirement. For a first hassle-free NAS, the Fractal Node 304 is the safe choice: silent, standard ATX PSU, airy assembly. And for maximum simplicity and lowest power consumption, a Topton/CWWK N100 kit gets you up and running in an evening.

Regardless of the case, the rest of your configuration matters just as much: suitable drives, reliable power supply, and good cooling. Find our selections on the recommended hardware page.

FAQ

ITX or mATX for a DIY NAS?

ITX if you stick to the motherboard’s SATA ports and 2.5 GbE networking: it’s more compact and sufficient for the majority of homelabs. Go for mATX (like the Fractal Node 804) if you plan to add an HBA card for more drives or a 10 GbE network card, as ITX offers only one PCIe slot.

Do I strictly need an SFX power supply?

No. The densest cases like the Jonsbo N3 require it, but the Fractal Node 304 accepts a standard ATX power supply, which is cheaper and easier to find. Always check the required format before buying your PSU.

How many bays should I plan for initially?

Aim for at least one or two more bays than your immediate need. Starting over to gain drive capacity is costly in time and money. Five to six bays comfortably cover most home and homelab uses.

Is an N100 kit enough for TrueNAS?

Yes for home use: file sharing, backups, media library, and a few containers. However, for RAM-intensive ZFS or numerous VMs, a scalable platform with more memory will be more comfortable.

How do I make my DIY NAS silent?

Prioritize large fans (120/140 mm) spinning slowly rather than small, fast models, ensure good airflow in front of the drives, and choose drives designed for NAS use. A good case like the Node 304 and a suitable drive (see our guide best NAS hard drive 2026) do most of the work.