How to Choose the Right NAS for Your Business: 2-Bay vs 4-Bay vs 8-Bay
A practical guide for Australian businesses comparing 2-bay, 4-bay and 8-bay NAS units, RAID levels, capacity planning and Synology vs QNAP in 2026.
Network attached storage is one of the few enterprise IT decisions where getting it wrong is genuinely painful. Buy too small and you outgrow it in 18 months. Buy too big and you have spent thousands on idle drive bays. Pick the wrong RAID level and a single drive failure can take your business offline. This guide walks through the practical decisions Australian businesses face when choosing between 2-bay, 4-bay and 8-bay NAS units, and compares Synology and QNAP, the two brands that dominate the SMB market in 2026.
Why Your Business Needs a NAS
A NAS is not just shared storage. Modern units running DSM (Synology) or QTS (QNAP) act as a Dropbox alternative, an off-site backup target, a Hyper-V or VMware datastore, a CCTV recorder, a 10GbE-capable file server and a Docker host - often all on the same box. For most Australian small businesses, a NAS replaces three or four separate appliances and pays for itself within 12 months in subscription savings alone.
The Core Decisions
Before you compare models, decide on four things:
- Usable capacity in 3 years, not today.
- RAID level based on how much downtime your business can absorb.
- Redundancy - is one NAS enough, or do you need two for replication?
- Network speed - 1GbE is fine for documents, 2.5GbE or 10GbE for video and design work.
2-Bay vs 4-Bay vs 8-Bay: Which Size Is Right?
Bay count determines two things: maximum capacity and your RAID options. Here is how the three common sizes compare in practical terms.
| Bay Count | Best For | Typical RAID | Usable Capacity (with 16TB drives) | Drive Failure Tolerance | Approx AUD (diskless) |
|---|---|---|---|---|---|
| 2-bay | Solo operators, home offices, small retail | RAID 1 (mirror) | ~16 TB | 1 drive | $500 - $900 |
| 4-bay | Small business 5 - 25 users, design studios, dental clinics | RAID 5 or SHR-1 | ~48 TB | 1 drive | $1,100 - $2,200 |
| 8-bay | 25 - 75 users, video production, MSP backup target | RAID 6 or SHR-2 | ~96 TB | 2 drives | $2,500 - $5,500 |
Capacity Planning: The 3-Year Rule
A common mistake is buying a NAS based on current data usage. By the time you have set it up, migrated existing shares and turned on photo backup for a few staff, you have already used 30 percent of capacity. A simple rule: forecast your data 3 years out and double it. If you have 4 TB today and grow at 2 TB per year, plan for at least 20 TB usable - which means a 4-bay with 4x 8 TB drives in RAID 5 is the minimum.
RAID Levels Explained Simply
- RAID 1 (mirror, 2 bays): Two drives, identical data. Half capacity, full redundancy.
- RAID 5 / SHR-1 (3+ bays): One drive's worth of parity. Lose any single drive and you can rebuild.
- RAID 6 / SHR-2 (4+ bays): Two drives' worth of parity. Survives two simultaneous failures - critical when rebuilding a large array.
- RAID 10 (4+ bays): Striped mirrors. Fast and resilient, but only 50 percent usable capacity.
For drives 8 TB and larger, we strongly recommend RAID 6 or SHR-2. With modern high-capacity drives, a RAID 5 rebuild can take 24 to 72 hours, during which a second failure leaves you with nothing.
Synology vs QNAP: The Honest Comparison
Both brands are excellent, but they have meaningfully different philosophies in 2026.
| Criteria | Synology (DSM) | QNAP (QTS / QuTS) |
|---|---|---|
| Operating System | Polished, conservative, very stable | Feature-packed, more configuration options |
| Hardware Speed | Generally slower CPUs, sufficient for files | Often faster CPUs and more RAM at same price |
| Networking | 2.5GbE on most new mid-range units | 2.5GbE / 10GbE more common |
| Drive Compatibility | Stricter compatibility list (2024+) | Open compatibility |
| Backup Tools | Active Backup for Business (free, excellent) | Hybrid Backup Sync (capable, more steps) |
| Best For | Set-and-forget reliability | Power users, virtualisation, 10GbE workloads |
When Synology Wins
Synology's DSM remains the gold standard for ease of use. If you want to deploy a NAS, hand the keys to a non-technical office manager and not think about it again, Synology is the answer. Active Backup for Business alone is a compelling reason to choose Synology - it backs up unlimited Windows PCs, Microsoft 365 tenants and VMware hosts at no extra cost.
When QNAP Wins
QNAP is the right answer when you need raw performance. If you are running 10GbE for video editing, hosting virtual machines, or building a Plex server with hardware transcoding, QNAP usually offers more horsepower per dollar. QNAP also has fewer restrictions on drive choice, which matters if you want to use Western Digital, Seagate IronWolf or Toshiba enterprise drives interchangeably.
Don't Forget the Drives
NAS drives are not the same as desktop drives. Always specify NAS-rated drives with TLER/CCTL support, designed for 24/7 operation in vibration-prone multi-bay enclosures. The dominant choices in Australia are:
- WD Red Plus (CMR, up to 14 TB) - the safe default for SMB.
- Seagate IronWolf / IronWolf Pro - excellent for 4-bay and above.
- WD Red Pro / Seagate Exos - enterprise-grade for 8-bay and high write workloads.
Avoid SMR drives (Shingled Magnetic Recording) in any RAID array - rebuilds can fail or take days.
Backups: Your NAS Is Not a Backup
This is the most overlooked part of NAS deployment. RAID protects against drive failure. It does not protect against ransomware, accidental deletion, fire, theft or controller failure. A complete backup strategy includes:
- Local snapshots on the NAS itself (built into DSM and QuTS hero).
- A second NAS at another site, or in a separate fire zone.
- Cloud backup to Synology C2, Backblaze B2 or AWS S3 Glacier.
This is the classic 3-2-1 rule: three copies, two media types, one off-site.
Quick Recommendations by Business Size
- 1 - 5 users: Synology DS224+ or DS423+ with 2x or 4x 8 TB WD Red Plus.
- 5 - 25 users: Synology DS923+ or QNAP TS-464 with 4x 12 TB WD Red Plus in SHR-1 / RAID 5, plus 2.5GbE switch.
- 25 - 75 users: Synology DS1823xs+ or QNAP TS-873A with 8x 16 TB IronWolf Pro in SHR-2 / RAID 6, plus 10GbE backbone.
- Backup target for an MSP: 8-bay QNAP with 10GbE and dedicated backup repository in RAID 6.
Final Word
For most Australian businesses, a 4-bay Synology or QNAP with NAS-rated drives in RAID 5 or SHR-1 is the right starting point. Buy bigger drives than you need today, plan a refresh in 5 years, and pair the NAS with a real backup strategy from day one. Done correctly, a NAS is one of the best-value pieces of IT infrastructure you will ever deploy.
Tech Kingdom carries the full Synology and QNAP range, plus NAS-rated drives from WD, Seagate and Toshiba with Australian warranty. Browse our Storage & Memory collection or contact our team for a sizing recommendation tailored to your business.
