Building a NAS yourself comes down to two decisions: what box to put it on, and whether to run TrueNAS or Unraid. Get those two right and a DIY NAS gives you more bays, more compute, and full hardware transcoding for a fraction of what a turnkey unit with the same specs costs. Get them wrong and you fight driver quirks, USB drop-outs, and a pool that rebuilds for a week. A UPS with graceful shutdown keeps a power cut off that list.
2026 makes the case stronger than it has been in years. A wave of small x86 NAS boxes (Aoostar, CWWK, Topton) now ship with Intel or Ryzen silicon, multiple SATA bays, 2.5GbE or 10GbE, and an open BIOS, so they run TrueNAS or Unraid out of the gate. At the same time Synology shipped its 2025 Intel models, the DS225+ and DS425+, without the Intel GPU driver in DSM, so they can no longer hardware-transcode Plex or Jellyfin on stock DSM, which is exactly the gap a DIY build fills. This guide ranks the hardware worth buying, settles the TrueNAS vs Unraid question, and walks through a TrueNAS install we ran end to end on 25.10 “Goldeye” in June 2026, with the Unraid 7.3 details checked in September 2026 and the hardware prices below checked again in October 2026.
Short answer: yes, a mini PC makes a good NAS, as long as the drives sit on SATA or M.2 inside the box rather than on a USB enclosure. Run TrueNAS on a mini PC when your drives are matched and data integrity comes first; run Unraid on a mini PC when the drives are mixed sizes or you want to add one at a time. For a finished box, the Aoostar WTR Pro at about $400 is the easiest start, and the WTR Max at about $660 is the one to buy if you want ECC and 10GbE.
Quick picks
If you want the verdict before the reasoning, here it is. Every box below has an open BIOS and runs TrueNAS or Unraid; the drives and the OS are separate choices covered further down.
- Best overall, easiest to live with: Aoostar WTR Pro. A finished 4-bay box with hot-swap trays, dual 2.5GbE, and two NVMe slots. Around $400 for the barebones, check the live price.
- Best value, most bays per dollar: 6-bay i3-1115G4 NAS board. A CWWK-design ITX motherboard with six SATA ports, four 2.5GbE NICs, and a PCIe x4 slot for about $260. You supply the case and PSU.
- Best powerhouse, real ZFS machine: Aoostar WTR Max. Eight Ryzen cores, ECC support, dual 10GbE SFP+, and eleven drive positions. Around $660, check the live price.
- Best when you already own a mini PC: a TerraMaster D4-320 USB enclosure bolts four bays onto any machine for about $170. Read the USB caveat below before you point ZFS at it.
- The OS: run TrueNAS if data integrity is the priority and your drives are matched; run Unraid if you have mismatched drives or want to add one disk at a time. Both are excellent in 2026.
How we built and tested this
The hardware picks were checked against each manufacturer’s spec sheet and a live retailer listing, and every Amazon link here was confirmed against the exact model before it went in. Prices move weekly during the 2026 storage and memory shortage, so each one is a band with a link to the live listing rather than a number that ages badly.
The software half is hands-on. We installed TrueNAS 25.10 “Goldeye” (build 25.10.4; install whatever 25.10 point release is current) on a fresh machine, carved four disks into a RAIDZ1 pool, created datasets, shared one over SMB, and opened the app catalog. The screenshots later in this guide are from that build, not from marketing pages. Unraid 7.3 was used for the comparison facts and licensing; both projects shipped a current stable release within the last few weeks.
TrueNAS vs Unraid: which OS to run
This is the decision that shapes everything else, because it dictates how your drives are organized and how you grow later. Both are mature and both run Docker apps and VMs. They differ on filesystem and flexibility. Our TrueNAS vs Unraid comparison tests both on the same box, including mixed drive sizes, adding one disk later and what each does about bit rot.
TrueNAS (the free Community Edition, formerly called SCALE) is built on ZFS. You get end-to-end checksums, scheduled scrubs that catch silent corruption, snapshots, and replication. The cost of that safety is rigidity: a RAIDZ group treats every disk as the size of the smallest, so you want matched drives, and although you can now expand a RAIDZ group one disk at a time, the older data keeps its original parity ratio until you rewrite it.
Unraid takes the opposite stance. Its array is a set of independent disks protected by one or two parity drives, so you can mix a 8TB, a 12TB, and a 20TB drive in the same array and add another whenever you like, as long as no data disk is larger than your parity disk. That flexibility is why it owns the “I bought drives over five years and none of them match” crowd. The trade-off is that the default XFS array has no block checksums (you can opt into btrfs or ZFS per disk), and Unraid is paid software.
| Factor | TrueNAS (Community Edition) | Unraid 7.3 |
|---|---|---|
| Cost | Free, open source | $49 / $109 / $249 one time, optional $36/yr updates |
| Device limit | None | Starter: 6 storage devices; Unleashed and Lifetime: unlimited |
| Boot device | Dedicated SSD (USB sticks discouraged) | USB flash, or internal NVMe/SSD since 7.3 |
| USB-attached data disks | Avoid for primary storage | Allowed in the array, same USB reliability caveat |
| Filesystem | ZFS only | XFS (default), btrfs, or ZFS per disk |
| Mixed drive sizes | Penalized (vdev = smallest disk) | Yes, freely |
| Add one disk at a time | Yes (RAIDZ expansion, with a parity-ratio caveat) | Yes, native |
| Data integrity | Strongest (checksums, scrub, snapshots) | Parity rebuild, optional btrfs/ZFS checksums |
| RAM | 8 GB minimum, ECC recommended | Lighter, no ZFS RAM demand unless you choose ZFS |
| Plex/Jellyfin transcoding | Yes, pass the iGPU into the container | Yes, pass the iGPU into the container |
| Best for | Maximum safety, matched disks, snapshots | Mixed disks, easy growth, media servers |
For most people the split is simple. If you are buying a matched set of drives and you care most about your data surviving a bad disk or bit rot, run TrueNAS. If your drives are a mixed bag or you plan to add capacity a disk at a time, Unraid earns its license fee. Mind the tier on small builds: the $49 Starter license covers six storage devices, so a six-bay board plus an NVMe cache pool already needs the $109 Unleashed tier. On the TrueNAS side, version 26 was still in beta in September 2026, so a new pool belongs on the 25.10 stable release. One note worth pulling out: a frequent point of confusion is ECC RAM on TrueNAS. TrueNAS strongly recommends it, but the docs are explicit that it is not required, and plenty of home pools run fine without it.
1. Aoostar WTR Pro: best overall
The WTR Pro is the box we point most people at because it removes the part beginners dread: there is no case to source, no PSU to match, no drive cage to wire. It arrives as a finished 4-bay enclosure with hot-swap trays, and you add RAM, an NVMe boot drive, and your disks.
The pick to buy is the AMD Ryzen 7 5825U barebones model. Eight cores handle a stack of containers and a Plex library without breaking a sweat, the two M.2 NVMe slots let you mirror a boot drive or run a fast cache pool, and the four SATA bays take drives up to 24TB each. Two DDR4 SO-DIMM slots take up to 64GB. Hardware transcoding runs through the Radeon iGPU over VA-API, which Jellyfin handles natively; Plex needs Plex Pass for any hardware transcoding, and its AMD support on Linux is unofficial, so an Intel QuickSync box is the safer Plex pick.
Who it is for: anyone who wants a NAS that looks and behaves like an appliance but runs the OS they choose. Skip it if: you want more than four spinning disks, or you specifically need Intel QuickSync, in which case the Intel N150 version of the WTR Pro is the cheaper, lower-power, QuickSync-equipped alternative, mainly sold direct by Aoostar. Note that the N150 version has a single RAM slot, while the 5825U model linked here has two.
2. 6-bay i3-1115G4 NAS board: best value
If you are comfortable putting parts in a case, nothing touches the price per bay of a NAS motherboard. This one is a CWWK design (the board silkscreen reads CW-TGL-NAS) sold on Amazon under the UDPTCP brand: a mini-ITX board with the CPU soldered on, six SATA ports, two NVMe slots, four 2.5GbE NICs, a PCIe 3.0 x4 slot, and two DDR4 SO-DIMM slots for up to 64GB of non-ECC memory, and it sells for around the price of an empty 4-bay turnkey chassis.
Read the CPU line before you buy, because it moved. The 8-core i3-N305 version of this board is no longer stocked on Amazon; what is in stock is the Tiger Lake build around a Core i3-1115G4, two cores and four threads with Intel UHD graphics. QuickSync transcoding is still on the table and file serving barely notices, but two cores is not the headroom the N305 gave you for a busy app stack, so size your container load accordingly. About $260 for six bays is still the standout number here. Four of those SATA ports come off a JMB585 controller through an SFF-8643 breakout cable rather than board-edge connectors, which is included but worth knowing before you plan cable routing. The listing had no customer reviews yet in late September, so buy it where returns are easy. CWWK also sells its boards directly, including higher-core variants, if the Amazon listing does not have the chip you want.
If six SATA ports is not enough, the board’s PCIe x4 slot takes a SAS HBA, and one card adds eight more drives; our HBA card guide for TrueNAS covers which cards run in IT mode and which cables they need. The case sets the ceiling on bays either way, and the NAS case roundup sorts the options from four-bay ITX cubes to twelve-bay towers.
Who it is for: the builder who wants the most drives per dollar and already has a small case and an SFX power supply, or is happy to buy them. Skip it if: you want a plug-and-play box. Two honest gotchas to plan for: add-on SATA controllers such as the JMB585 often hold the CPU out of its deepest package sleep states, so idle power can sit a few watts higher than the chip alone would suggest, and six spinning drives draw a surge at power-on, so pick an ATX or SFX supply (the board takes standard 24-pin plus 4-pin power) with headroom on its SATA rail.
The one part the board does not include is a home for the drives. The Jonsbo N3 is the case most builders pair it with: a mini-ITX NAS cube with eight 3.5-inch bays (two more than the board’s six ports, so you have headroom), two built-in fans, and room for an SFX power supply. It runs around $160, check the live price.
Add the case, a stick of RAM, and a small boot SSD and you have a six-bay NAS for less than a finished four-bay appliance costs.
3. Aoostar WTR Max: best powerhouse
The WTR Max is what you buy when the NAS is also going to be your virtualization host and you want to run ZFS the way it is meant to be run. It is built around the Ryzen 7 PRO 8845HS, eight cores and sixteen threads, and crucially it supports ECC memory up to 128GB across two DDR5 slots.
The connectivity is the headline. Two 10GbE SFP+ ports plus two 2.5GbE, USB4, and an OCuLink port for external PCIe, with six SATA bays and five NVMe slots for eleven drive positions in total. ECC plus 10GbE plus that many bays is territory Synology and UGREEN simply do not sell at this price, which lands around $660 for the barebones (check the live price). The Amazon listing linked here is Aoostar’s own store with only a few units left in mid-October, so if it sells out, Aoostar sells the same barebones direct at the same price. Transcoding runs on the Radeon 780M through VA-API, which Jellyfin handles well; Plex on AMD under Linux is unofficial, so plan on Jellyfin if transcoding matters on this box.
Who it is for: the ZFS builder who wants ECC, 10GbE, and room to grow into a real homelab. Skip it if: you only need file storage; the extra cores, ECC, and 10GbE are wasted money if nothing will use them. For the layout choices that make the most of this many bays, our ZFS RAID levels guide covers how mirrors and RAIDZ trade capacity against rebuild safety.
4. A mini PC plus a TerraMaster D4-320: if you already own a mini PC
If there is already an Intel mini PC on your desk doing light duty, the cheapest way into a NAS is to hang drives off it. The TerraMaster D4-320 is a 4-bay USB 3.2 Gen2 enclosure that connects over a single 10Gbps Type-C cable, and at around $170 it turns any machine into a four-disk NAS.
There is a caveat that has to be stated plainly: USB-attached disks are not a good home for ZFS. USB-to-SATA bridges can drop or renumber devices and hide drive serials and SMART data, which is exactly the information ZFS relies on to handle errors, and a dropped device mid-write can fault a pool. The D4-320 is actually the safer style of enclosure for this because it does pure JBOD passthrough with no RAID firmware in the way, but treat it as a budget or Unraid-array path for non-critical data, not as the foundation for an important TrueNAS pool. Our DAS and JBOD enclosure guide sorts enclosures by how each bay is bridged, which decides whether ZFS sees real serials and SMART data.
Who it is for: the person with a capable mini PC already running and a tolerance for the USB caveat. If you want a deeper look at the small machines that pair well here, our homelab mini PC roundup covers the boxes worth basing this on. Skip it if: this is your primary copy of anything you cannot lose.
5. UGREEN NASync DXP4800 Plus: buy turnkey, run DIY
There is a middle path between building from parts and accepting a locked-down appliance: buy a turnkey x86 box that ships with an open BIOS, then wipe its OS and install TrueNAS or Unraid. The UGREEN NASync DXP4800 Plus is the box that made this popular. It is a finished four-bay unit with a built-in 10GbE port alongside 2.5GbE, two NVMe slots, a 128GB internal SSD, and an Intel iGPU that keeps QuickSync. Its BIOS is open, which is why the DXP4800 Plus became a favorite box to flash TrueNAS or Unraid onto. UGREEN’s position on whether a third-party OS affects the hardware warranty has been inconsistent, so confirm that with UGREEN before you wipe the stock system.
Who it is for: the reader who wants appliance fit and finish, built-in 10GbE, and Intel transcoding, but not Synology’s software lock-in or a parts list. It sells for around $660, check the live price. Skip it if: you want the most bays per dollar, which the CWWK board still wins. And if you would rather keep a polished vendor OS and not flash anything at all, the best NAS for home and self-hosting roundup weighs the DXP4800 Plus against Synology and the rest as turnkey units.
The rest of the parts: drives, boot SSD, and RAM
The box is half the build. Three more decisions finish it.
Drives are where the money goes and where mistakes hurt. Buy CMR NAS drives and avoid drive-managed SMR, which can stall a RAID or ZFS rebuild for days; our CMR vs SMR breakdown explains why, and the best NAS hard drives guide lists the safe models by capacity. HDD prices climbed 30 to 50 percent through 2026, so buy the capacity you need now rather than waiting for a dip that is not coming this year.
A small NVMe drive handles the OS and apps. TrueNAS wants a dedicated boot device (modern versions write to it enough that USB sticks are discouraged), and a WD Blue SN5100 500GB, two generations on from the SN580 (the SN5000 came in between) and built on QLC flash rather than the SN580’s TLC, is plenty for boot plus an app or cache pool. Check who is selling it before you buy: small NVMe listings on Amazon have been showing marketplace prices far above normal, and any 256GB to 500GB NVMe drive does the job. Unraid is the exception: it traditionally boots from a USB flash drive with the license tied to that stick, and since 7.3 it can also boot from an internal NVMe, SSD, or eMMC device with a TPM-based license, which frees the USB port and removes the flash drive as a failure point.
RAM sizing follows the OS. TrueNAS wants 8GB as a floor and is happier with 16 to 32GB once apps are running; Unraid is content with less. A 32GB DDR4 SO-DIMM (two for 64GB) covers the DDR4 boxes here. Crucial’s single 32GB DDR4-3200 stick had no live Amazon listing in mid-October, so the link goes to its 64GB kit of two 32GB DDR4-3200 SO-DIMMs, sold through a third-party seller. Fair warning: the 2026 memory shortage has that kit at about $500 in mid-October, roughly $250 a stick and far above 2025 prices, so budget the RAM and boot SSD as seriously as the box itself.
How to turn a mini PC into a NAS
If you already own a mini PC, the conversion is mostly a question of where the drives connect. Internal SATA or M.2 is the path that works with either OS. A USB enclosure is the fallback when the box has no room, and it limits what you should trust to it: TrueNAS’s own hardware guide says to avoid USB-connected disks for primary storage, partly because USB bridges can report drive serial numbers inaccurately.
- Count the internal slots. Most mini PCs have one or two M.2 slots and at most one 2.5-inch SATA bay. Two NVMe drives in a mirror make a small, fast, fully supported NAS; spinning disks need a NAS-style box or an enclosure.
- Pick the boot device. TrueNAS takes a whole drive for boot, so a two-slot machine gives one M.2 to boot and one to data unless you add storage. Unraid 7.3 can boot from USB or an internal drive.
- Add bulk storage. For disks, a JBOD USB 3.2 enclosure like the D4-320 is the budget route. Use it for an Unraid array or backup copies, and keep irreplaceable data on internal SATA or NVMe.
- Install the OS and build the pool. Flash the installer to a USB stick, install to the boot drive, then create the pool or array from the web UI. The TrueNAS walkthrough below shows each screen.
- Protect it. Put it on a UPS that the OS can read over USB, and set up a backup that leaves the box.
Install TrueNAS and create your first pool
Once the parts are together, TrueNAS is the faster of the two to get running, so it is the one we walk through. The installer is a short text menu: pick the boot SSD as the destination, set a password for the truenas_admin account, choose legacy or EFI boot to match your firmware, and reboot. Mini PCs often ship with Secure Boot on, so disable it (or set it to Other OS) in the BIOS first, or the installer will not boot. The console then prints the web address to open in a browser.
The dashboard is the landing page. It confirms the version, the CPU and memory, and the health of everything at a glance.
The first real task is the storage pool. Under Storage, the Create Pool wizard lists the disks it can use; we selected the four data drives and chose RAIDZ1, which keeps the array alive through a single disk failure. The result is a healthy pool named tank, reported here as one RAIDZ1 group, four wide.
A pool on its own is just space. You carve it into datasets, which are the unit you snapshot, share, and set quotas on. We created a media dataset and a backups dataset under the pool.
To reach a dataset from other machines, you share it. An SMB share is the right default for a mixed network of Windows, macOS, and Linux clients. We shared the media dataset and started the SMB service, which the Shares page shows running. TrueNAS will not serve SMB to root or its built-in accounts, so first create a user under Credentials > Users with SMB Access enabled; that account is the one clients log in with.
From a Linux client, install the CIFS tools (cifs-utils from apt or dnf), create a mount point, and mount the share as that SMB user to confirm it works:
NAS_IP=192.168.1.50
SMB_USER=nasuser
sudo mkdir -p /mnt/media
sudo mount -t cifs //${NAS_IP}/media /mnt/media -o username=${SMB_USER}The last piece that makes a DIY NAS worth more than an appliance is the app catalog. TrueNAS moved to Docker-based apps, and the Discover page lists around 385 of them, Plex and Jellyfin and Immich and Nextcloud among them, each a few clicks to deploy onto your pool.
That is the whole loop: install, pool, dataset, share, apps. Everything after that, the snapshots, the replication jobs, the containers, builds on those same five screens.
What to get right before you buy
A few decisions matter more than the brand on the box.
Match bays to a five-year plan, not today. A 4-bay box feels roomy until a media library outgrows it, and adding bays later means a new chassis. If you can see yourself wanting more than four drives, start with six or buy the WTR Max.
CMR drives, never drive-managed SMR. This is the one non-negotiable. SMR drives can take days to rebuild into an array and sometimes drop out mid-rebuild, turning one failed disk into a data-loss event. Stay inside the NAS-branded lines and you are safe.
Decide on ECC honestly. ECC adds a layer of protection against memory errors corrupting data on the way to disk. TrueNAS recommends it but does not require it, and only the WTR Max on this list takes it, and only with true ECC SO-DIMMs rather than standard memory. For irreplaceable data it is worth the box that takes it; for a media server it is a nice-to-have.
Confirm transcoding if you run Plex or Jellyfin. Hardware transcoding turns a 4K stream from an 80 percent CPU pin into a 10 percent one. Every Intel box here has QuickSync; the Ryzen boxes transcode through VA-API, which Jellyfin supports well and Plex supports only unofficially on Linux. Plex hardware transcoding also needs Plex Pass. Either way, you have to pass the GPU device into the container, which both TrueNAS and Unraid support.
Right-size RAM and the network. 2.5GbE is the floor in 2026 and saturates a couple of spinning drives; 10GbE only pays off with NVMe or a wide array and a switch to match. Give TrueNAS 16GB or more once you add apps.
Protect it and connect it. A ZFS pool hates an abrupt power cut, so put the NAS on a pure sine wave UPS such as the CyberPower CP1500PFCLCD, which TrueNAS reads over USB and uses to shut the pool down cleanly when the battery runs low. To actually use those 2.5GbE or 10GbE ports you also need a switch that speaks the same speed, like the TP-Link TL-SG108S-M2, a fanless eight-port 2.5G unmanaged switch in a metal case. Check the live price on both.
Plan for noise and power. The spinning drives, not the CPU, set both the idle wattage and the sound. A four-drive box idles quietly, but pack six or eight disks and the spin-up surge and the steady hum become real, so a case with decent fans and staggered spin-up earns its place.
Remember that RAID is not a backup. A RAIDZ pool survives a dead disk. It does not survive ransomware, a fat-fingered delete, or a house fire. Keep to the 3-2-1 rule: three copies, on two kinds of media, one of them off-site. ZFS snapshots and replication cover the on-box layer nicely, but something still has to leave the building.
Which one should you build?
Strip away the detail and three clear paths remain. If you want the least friction, buy the Aoostar WTR Pro, drop in matched CMR drives, and run TrueNAS; it behaves like an appliance and protects your data properly. If you are counting every dollar and do not mind assembly, the CWWK 6-bay board gives you six bays for the price of an empty enclosure. If the NAS is also your homelab, the Aoostar WTR Max with ECC and 10GbE is the one you will not outgrow.
On software, let your drives decide: matched disks and a low tolerance for data loss point to TrueNAS, a pile of mismatched drives points to Unraid. And if a finished, supported box still sounds better than building one, the best NAS for home and self-hosting roundup covers the turnkey options worth buying instead.
