Prebuilt NAS vs DIY: Should You Buy a Synology or Build Your Own?
Synology and UGREEN sell convenience. A DIY build sells capability per dollar. Here's the real cost of each once drives are in, and which one is actually right for a budget homelab.
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Once you have decided you want a NAS rather than drives hanging off your server, the next question splits the homelab audience cleanly in half: buy a finished box from Synology or UGREEN, or build one yourself.
Most comparisons answer this badly, because they compare a prebuilt NAS to a hypothetical DIY build that nobody actually assembles. The honest version starts with what the two things cost when they are both finished, powered, and holding your data.
What you are actually paying for
A prebuilt NAS is not a computer with a markup on it. You are buying three things bundled together: the hardware, an operating system that was written for that exact hardware, and someone to call when it stops working.
The hardware is the cheapest part of that bundle. Synology’s entry boxes run modest Realtek or Intel chips with 2 to 4GB of soldered or semi-upgradeable RAM. On raw specs, a $130 mini PC beats a $400 NAS handily. That comparison is also missing the point, because the DSM software, the mobile apps, the one-click backup targets, and the fact that a drive failure produces an email instead of a research project are the actual product.
A DIY NAS inverts the ratio. You get far more compute and memory per dollar, plus the ability to run everything else your homelab needs on the same box. You supply the integration work yourself, and you are the support line.
The real cost, both ways
Prices move constantly, so treat these as ranges rather than quotes. Drives are excluded because they cost the same regardless of which path you take, and they are usually the biggest number on the receipt.
| Path | Hardware cost (diskless) | Bays | What you get |
|---|---|---|---|
| Synology 2-bay entry (DS200-class) | $250 to $330 | 2 | DSM, mobile apps, vendor support |
| Synology 4-bay (DS400-class) | $500 to $700 | 4 | Same, plus real capacity headroom |
| UGREEN NASync 4-bay | $450 to $600 | 4 | Much stronger hardware, less mature software |
| Mini PC plus 4-bay USB enclosure | $230 to $350 | 4 | Full general purpose server, DIY software |
| Used SFF desktop plus HBA | $150 to $280 | 4 to 8 | Most capacity per dollar, highest power draw |
| Purpose-built DIY (N100 board, case, PSU) | $300 to $450 | 4 to 6 | Clean build, low power, most assembly work |
The pattern: DIY wins on hardware-per-dollar at every tier, and the gap widens as bay count goes up. A 4-bay prebuilt costs roughly what a complete 6-bay DIY build costs, and the DIY box will have four times the RAM.
Two costs that do not show up in that table and should:
Drive bays you will actually use. A 2-bay NAS with two drives in mirror gives you one drive of usable capacity. People consistently outgrow 2-bay boxes and then discover that migrating to a 4-bay means buying a second complete unit. Buy more bays than you think you need, in either direction.
Your time. A DIY build is a weekend the first time. That is genuinely a cost, and if you would rather spend the weekend on literally anything else, that is a legitimate reason to buy the prebuilt. It is not a reason to pretend the hardware is comparable.
Where prebuilt genuinely wins
The software is finished. DSM has had two decades of polish. Photo backup from a phone works on the first try, share permissions have a real UI, and the failure emails arrive before you notice the problem. Nothing in the DIY world is quite this smooth end to end.
Non-technical household members can use it. This one is underrated. If your partner needs to get files off the NAS while you are out, a Synology app is a much easier handoff than an SMB path and a lecture about drive letters.
Drive failure is a procedure, not a project. Pull the failed drive, put a new one in, click rebuild. On a DIY box that is also true if you set it up correctly, and it is genuinely not true if you did not.
Physical footprint and noise. A 4-bay NAS is small and quiet by design. A repurposed desktop is neither.
Where DIY genuinely wins
One box does everything. This is the real argument, and it is a big one. A DIY NAS running Unraid or Proxmox is also your Docker host, your Jellyfin server, your Immich instance, and your reverse proxy. Consolidating storage and compute into one machine removes an entire device from your rack and your power bill. A Synology can run containers, but you will hit its RAM ceiling fast and you will be fighting the platform to do it.
Upgradeability. RAM, drives, network card, boot device, all replaceable. Synology solders RAM on its lower models and validates a narrow list of drives. A DIY box takes whatever you put in it, including used enterprise SSDs that cost a fraction of retail per terabyte.
No vendor lock-in on your data layout. Unraid and TrueNAS both store data in ways you can recover on any Linux machine. If a Synology unit dies out of warranty, recovering a Synology Hybrid RAID array without another Synology is possible but genuinely unpleasant.
No vendor policy risk. Synology’s move toward restricting features to its own branded drives on newer models is exactly the kind of decision you have no say in when you buy the ecosystem rather than the hardware.
The three builds worth considering
Mini PC plus USB enclosure, $230 to $350. Cheapest credible path. A budget mini PC plus a 4-bay USB-C enclosure. Low power, small, and the mini PC does double duty as your Docker host. The catch is USB attachment: it is fine for media and backups, and it is a bad foundation for ZFS, which does not tolerate the way USB bridges handle errors and device IDs. Run Unraid or OpenMediaVault here, not TrueNAS.
Used small form factor desktop, $150 to $280. An OptiPlex or ThinkCentre SFF with real SATA ports and room for drives. Best capacity per dollar by a wide margin, and SATA is a proper storage interface rather than a workaround. The tradeoff is idle power, often 55 to 80 watts against 25 to 35 for the alternatives. At $0.15 per kWh, an extra 40 watts is about $52 a year, which pays back the savings in roughly three years and then keeps costing you. Worth doing the power math before you commit.
Purpose-built N100 NAS, $300 to $450. An N100 or N150 motherboard with four to six SATA ports, a small case, and an SFX power supply. This is the enthusiast answer: prebuilt-class power draw, DIY-class flexibility, and a machine that looks like it was meant to exist. It is also the most assembly work and the easiest one to overspend on.
Whichever you pick, put it on a UPS. A parity array losing power mid-write is the one storage failure mode that is both common and genuinely destructive.
How to actually decide
Answer these three honestly.
1. Do you already run Docker or a hypervisor? If yes, DIY, and consolidate storage onto a machine you already understand. If no, and you do not want to learn right now, prebuilt. The DIY path assumes a baseline comfort with Linux that the prebuilt path does not.
2. Will anyone other than you depend on this? If the answer is a household that will notice when it breaks, weight heavily toward prebuilt, or toward a DIY build on Unraid specifically, which has the friendliest recovery story of the three main NAS operating systems.
3. Is the budget constrained enough that $200 changes the drive capacity you can afford? If yes, DIY, and put the difference into drives. Capacity you can actually use beats a nicer enclosure every single time.
What I run, and what I would tell a friend
I run Unraid on a self-built box with an offsite copy to Backblaze B2. That was the right call for me because the same machine also holds application data for a stack of services, and because I wanted to choose my own drives. It took a weekend and it has been boring ever since, which is the highest compliment you can pay a NAS.
If a friend asked me cold, though, I would ask what they are doing with it. Someone who wants phone photo backup and a place for documents, with no interest in the homelab hobby itself, should buy a 4-bay prebuilt and never think about it again. Someone who is reading a site called Budget Homelab is almost certainly better served building it, because the thing they actually want is a server that also stores files, and that is not what a prebuilt NAS is.
The mistake to avoid in either direction is buying a 2-bay anything. It is the one decision people reliably regret, and the fix costs more than doing it right the first time.
Next, once the hardware question is settled: what a homelab actually costs to run, and how to get your backups off-site so the array is not your only copy.