Building a DIY NAS in 2026: ITX NAS Boards, Jonsbo Cases and TrueNAS or Unraid

A prebuilt NAS from Synology, QNAP or UGREEN hands you a finished appliance: drive bays, an OS, mobile apps and a support line. A DIY NAS build hands you something different — control over the drive count, the network speed, the filesystem and how long the machine stays useful. The question is not which approach is better in the abstract. It is which one matches how much time you want to spend.

This guide is for readers who have outgrown a four-bay box, or who want more than two SATA ports and 2.5GbE without paying for a vendor’s software stack. It walks through the parts that actually matter in a storage build: the motherboard and its SATA controller, the case and its backplane, memory and ECC, boot and cache drives, and the operating system you commit to for the next five years.

Nothing here reflects first-hand use. We compared published specifications, documented behaviour of the major NAS operating systems, and the failure points people report in home lab communities.

When building beats buying a prebuilt NAS

Four situations make a custom build the clearer choice. You need six or more drives, and prebuilt units at that bay count get expensive fast. You want to run virtual machines or containers alongside storage. You want ZFS with full control over pool layout. Or you intend to upgrade the CPU and RAM separately from the chassis, years from now.

The opposite case is just as real. If you want Time Machine backups, photo sync and a phone app that works without configuration, an appliance gets you there in an afternoon. Our guide to four-bay NAS enclosures from Synology, QNAP, UGREEN and Terramaster covers that path in detail.

Budget honesty helps too. A DIY machine at the same bay count rarely saves money once you add a power supply, case, board and memory — what you buy is flexibility and the ability to repair individual parts.

The motherboard decides the shape of the build

Mini-ITX NAS boards built around Intel’s N100 and N150 have become the default starting point for low-power home storage. They are soldered-CPU boards, so there is no upgrade path, but they idle low and handle SMB shares and a handful of containers without complaint.

The HKUXZR N100/N150 board is a representative example of the category. It carries six SATA 6Gbps ports, two Intel i226-V 2.5GbE NICs, two M.2 NVMe 2280 slots and a PCIe 3.0 x4 slot, on a 17cm square footprint. Note how the SATA ports are wired: one is native to the chipset, and the other five run through a JMB585 controller.

Why the SATA controller matters

Third-party SATA chips share bandwidth across the drives attached to them. For spinning disks on a 2.5GbE network that is almost never the bottleneck, since a single mechanical drive cannot saturate one SATA lane. It becomes a real constraint if you plan an all-SSD pool. Check too that your chosen OS recognises the controller cleanly — JMicron and ASMedia chips are widely supported in modern Linux kernels, which covers TrueNAS SCALE, Unraid and OpenMediaVault.

ECC or not

ZFS does not require ECC memory, and the long-running claim that non-ECC RAM will destroy a pool overstates the risk. ECC does protect against silent bit flips that corrupt data before ZFS ever checksums it, which matters for irreplaceable archives. The catch is that N100 and N150 boards generally do not support it — the HKUXZR board takes a single DDR5 SO-DIMM up to 32GB, explicitly non-ECC. If ECC is a hard requirement, you move to a Xeon, Ryzen Pro or EPYC embedded platform, which costs more and draws more power. Our NAS RAM upgrade guide goes deeper on module compatibility.

Cases: bays, backplanes and airflow

The chassis dictates drive count, cooling and how annoying maintenance will be. Hot-swap backplanes matter more than people expect — pulling a failed disk from a tray beats unscrewing a cage with the machine powered down.

The Jonsbo N3 packs eight 3.5-inch bays plus one 2.5-inch SSD into a 233 × 262 × 298mm aluminium and steel cube, with a server-grade hot-swap backplane and two 10cm fans aimed through the drive compartment. It takes ITX boards, an SFX power supply up to 105mm and coolers up to 130mm tall. Split top and bottom compartments keep drive heat away from the board.

The Jonsbo N4 trades two bays for a wider footprint and micro-ATX support. It offers six 3.5-inch bays — four hot-swap, two fixed — plus two 2.5-inch SSD mounts, four expansion slots and a black walnut front panel that suits a living room better than bare metal. The 70mm cooler limit pushes you toward low-TDP CPUs or a downdraft cooler.

SilverStone’s CS382 is the choice when you want room to grow. Eight hot-swappable trays accept 2.5-inch or 3.5-inch SAS-12G or SATA-6G drives with status LEDs, and the chassis supports up to 11 drives total, a full ATX PS2 power supply and a 240 or 280mm radiator. SAS support means you can add an HBA and use enterprise drives. Our home server case roundup covers rack-mount alternatives.

Boot drives, cache and pool layout

Keep the boot device separate from the storage pool. TrueNAS and Unraid both write logs and configuration constantly, and consumer USB sticks wear out under that load. A small SATA SSD or an NVMe drive is the sane choice; the HKUXZR board’s internal USB headers exist for the Unraid licence-key stick, which is a different use case.

Cache is where people overspend. An NVMe read cache helps little for sequential media streaming and helps a lot for metadata-heavy workloads like photo libraries or VM disks. Unraid’s cache pool absorbs incoming writes at SSD speed, then moves data to the array on a schedule.

For pool geometry, decide redundancy before you buy drives. Two-disk parity is the sensible default above six bays given modern rebuild times, and the RAID level guide breaks down the maths.

TrueNAS, Unraid and OpenMediaVault compared

System	Storage model	Mixed drive sizes	Expansion style	Licensing
TrueNAS SCALE	ZFS pools with vdevs	Possible but wasteful	Add a full vdev, or replace every disk in one	Open source
Unraid	Parity array plus cache pool	Fully supported	Add one drive at a time	Commercial licence
OpenMediaVault	Debian with mdadm, ext4 or ZFS plugins	Depends on chosen layout	Manual, via Linux tooling	Open source
Proxmox VE with ZFS	ZFS pools, virtualisation first	Possible but wasteful	Same vdev rules as TrueNAS	Open source, paid support tiers

TrueNAS SCALE suits people who want checksums, snapshots and replication handled properly, and who can plan capacity in whole vdevs up front. Unraid prioritises flexibility and drive-at-a-time growth over raw speed, and its container ecosystem is the friendliest of the three. OpenMediaVault is the lightest option and the most Linux-flavoured, which is either freedom or homework depending on your temperament.

Trade-offs and who should choose something else

A build takes a weekend before anything works properly, and the first months involve tuning fan curves, SMART schedules and share permissions. Nobody ships you a firmware update that fixes an incompatibility. You are the support line.

Prebuilt units win on mobile apps, documented backup workflows and warranty as a single unit. If your main goal is Mac backups, the Time Machine to a NAS walkthrough shows how little friction an appliance involves. Soldered-CPU ITX boards also cap your upgrade path, so treat them as a known-lifespan purchase rather than a platform. If the machine needs a dedicated circuit or new outlets, follow local electrical code and use a licensed electrician where your jurisdiction requires one.

What to actually build

For most readers, pair the HKUXZR N100/N150 board with 32GB of DDR5, a small NVMe boot drive and the Jonsbo N3. That gives eight bays, dual 2.5GbE and low idle draw in a cube that fits on a shelf. Run TrueNAS SCALE if your data is precious and your growth is predictable; run Unraid if you expect to add mismatched drives over time.

Choose the Jonsbo N4 instead when the machine lives in a shared room and six bays are enough — the walnut panel and micro-ATX support make it the more domestic option. Step up to the SilverStone CS382 when you want SAS drives, an HBA and headroom past eight disks. Start with half your bays populated, keep the parity plan fixed, and add disks as the library grows.

How these picks were chosen: HomeNode compares products using manufacturer specifications, current Amazon listing details and published owner feedback. Products are not tested in-house, and listings change often, so confirm current specifications on the product page before buying.

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