Best NAS for Multi-Site Business Australia 2026

The best NAS for multi-site business in Australia in 2026 is a pair of Synology DS1525+ units ($1,285 each at Mwave, $1,399 at Scorptec) connected via Synology Drive ShareSync over a site-to-site VPN tunnel. This gives you real-time or scheduled file sync between offices, local-speed access at each site, and a built-in disaster recovery layer. All without monthly per-user cloud sync fees. For businesses running three or more sites, the DS1825+ ($1,799 at Scorptec) at the hub site handles the extra sync load. If your team prefers QNAP’s ecosystem, the TS-473A ($1,369-$1,489) with Hybrid Backup Sync delivers similar multi-site sync capabilities with more raw hardware for the price. This guide covers the architectures, sync tools, VPN options, and NBN realities that determine whether a multi-site NAS deployment actually works across Australian distances.

Why Multi-Site Businesses Need NAS-to-NAS Sync

Cloud-only file sharing works until it doesn’t. A 15-person accounting firm with offices in Sydney and Melbourne might run fine on SharePoint. Until tax season hits and 30 staff are simultaneously opening large Excel workbooks and PDF bundles over a 40Mbps NBN connection. Every file open is a download. Every save is an upload. Multiply that by dozens of concurrent users and the cloud becomes the bottleneck, not the solution.

A NAS at each site solves this by keeping a synchronised local copy of shared files. Staff in Melbourne access files from their local NAS at gigabit LAN speeds. Changes sync to the Sydney NAS in the background. Nobody waits for downloads, nobody fights for upload bandwidth, and if the internet drops at one site, work continues uninterrupted because the files are local.

The secondary benefit is disaster recovery. With synchronised NAS units at two or more sites, you have geographically separated copies of your data by default. If one office floods, burns, or gets robbed, the other site has a current copy. This is a core component of the 3-2-1 backup strategy. Three copies, two different media, one offsite. And multi-site NAS sync delivers the offsite copy without paying for cloud storage.

The NBN Upload Problem for Australian Multi-Site Sync

Any multi-site NAS deployment in Australia runs into the same constraint: NBN upload speeds. On a standard NBN 100/20 plan. The most common business tier. You get roughly 18-20Mbps upload in practice. That’s the ceiling for how fast one site can push changed files to another. On NBN 50, it drops to around 18Mbps. Even on NBN 250, typical upload is only 25Mbps unless you’re on an NBN Enterprise Ethernet or business nbn connection with symmetric speeds.

What does this mean in practice? At 20Mbps upload, syncing 1GB of changed files takes roughly 7 minutes. For an office generating 5-10GB of changes per day (common for professional services firms working with documents, spreadsheets, and PDFs), the daily sync completes comfortably within business hours. But if your business works with large video files, CAD drawings, or medical imaging, the initial seed sync and ongoing daily sync may need to run overnight.

The practical workaround is seed the initial sync locally. Copy your full dataset to the remote NAS via USB before deploying it at the other site. After that, only changed blocks need to sync over the WAN. And both Synology Drive ShareSync and QNAP HBS 3 use delta sync (only transferring the changed portions of files) to minimise bandwidth usage. For more on optimising your NAS network, see our NAS networking guide.

Architecture: Hub-and-Spoke vs Mesh

Multi-site NAS sync follows two basic architectures, and the right choice depends on how many sites you have and how they share data.

Hub-and-Spoke

Hub-and-spoke designates one site as the central hub (typically head office) with a larger NAS. All branch sites sync to and from the hub. Branch sites do not sync directly with each other. This is the simplest and most common architecture for Australian multi-site businesses.

Best for: Businesses where the head office is the source of truth. Professional services firms, retail chains with a central office, medical practices with a primary clinic. Simpler to manage, fewer VPN tunnels, and the hub NAS can run Active Backup for Business to back up branch-site NAS units as well.

Hub NAS: Synology DS1825+ ($1,799 at Scorptec) or DS1525+ ($1,285-$1,399) depending on capacity needs. The hub handles sync connections from every branch, so it needs more CPU headroom, more RAM, and more bays for the combined dataset.

Spoke NAS: Synology DS925+ ($995 at Scorptec, $1,029 at Mwave) or DS425+ (~$980 at Scorptec, $899 at Mwave) for smaller branches that only need a subset of shared folders.

Mesh (Peer-to-Peer Sync)

Mesh sync has every site sync directly with every other site. Changes at any site propagate to all others. Synology Drive ShareSync supports this natively. Each NAS can be both a sync server and client simultaneously.

Best for: Businesses where multiple offices contribute equally to shared datasets and need instant access to each other’s changes. Design agencies with offices in Sydney and Melbourne, or construction firms with project sites that all feed into the same document set.

Downside: Complexity scales exponentially. Two sites = one sync pair. Three sites = three sync pairs. Four sites = six sync pairs. Each pair needs its own VPN tunnel. Beyond three sites, mesh becomes difficult to manage and the hub-and-spoke model is almost always the better choice.

VPN: The Backbone of Multi-Site NAS Sync

NAS-to-NAS sync should always run over a VPN tunnel, not over the open internet. Both Synology and QNAP NAS units can establish VPN connections directly, but a dedicated router or firewall at each site is the more robust approach.

WireGuard is the current gold standard for site-to-site VPN tunnels. It’s faster than IPsec for most workloads, uses less CPU, and is simpler to configure. Synology DSM 7.2 supports WireGuard natively through VPN Server. QNAP supports it via the QVPN Service app. However, for the most reliable site-to-site connections, run the VPN on your router or firewall. Not on the NAS itself. UniFi Dream Machine Pro ($869 at PLE), Ubiquiti Cloud Gateway Fiber ($559 at Scorptec), or even the Cloud Gateway Ultra ($199 at Scorptec) all support site-to-site WireGuard or IPsec tunnels and keep the VPN layer independent of your NAS.

IPsec remains the standard for businesses already running Cisco, Fortinet, or similar enterprise firewalls. It is well-supported on both Synology and QNAP and provides robust encryption with broad hardware compatibility.

Latency across Australian capital cities is typically 10-25ms (Sydney to Melbourne), 20-40ms (Sydney to Brisbane), and 40-65ms (Sydney to Perth). These latencies are fine for background file sync but noticeable for real-time file access. This is precisely why local NAS copies matter. Staff access files locally at LAN speed, and sync handles the WAN transfer in the background. For a deeper dive on remote access options, see our NAS remote access and VPN guide.

Synology Drive ShareSync vs QNAP Hybrid Backup Sync

These are the two sync engines that make multi-site NAS work. Both are free, both run on their respective NAS platforms, and both handle the core job. But they approach it differently.

Synology Drive ShareSync is the more polished solution for NAS-to-NAS sync specifically. It treats each NAS as a node in a sync network, supports both real-time and scheduled sync, and handles file versioning and conflict resolution automatically. The Synology Drive desktop client also syncs files from individual workstations, so staff get a Dropbox-like experience backed by your own NAS infrastructure. For most multi-site Australian businesses, this is the tool to use.

QNAP Hybrid Backup Sync (HBS 3) is more of a Swiss army knife. It handles local backup, remote backup, cloud backup, and sync in one app. Site-to-site NAS sync is supported via RTRR (Real-Time Remote Replication) jobs, and Qsync adds desktop client sync. The trade-off is that HBS 3 is more complex to configure and the admin interface is less intuitive than Synology Drive. QNAP’s strength is flexibility: HBS 3 can sync to cloud targets (S3, Azure, Backblaze B2) in the same job chain, which is useful if you want a third copy in the cloud as part of your cloud backup strategy.

Recommended NAS Pairs for Multi-Site Deployment

Best Overall: Synology DS1525+ at Every Site

The Synology DS1525+ is the sweet spot for multi-site deployments. Five bays gives enough capacity for a full shared dataset plus local backups. 8GB ECC RAM handles Drive ShareSync, Active Backup for Business, and day-to-day file serving without strain. Dual 2.5GbE ports allow link aggregation for LAN throughput, and two M.2 NVMe slots accelerate random I/O during sync operations.

At $1,285 from Mwave or $1,399 from Scorptec per unit, a two-site deployment costs $2,570-$2,798 for the NAS hardware alone. Add four 8TB drives per NAS in RAID 5 (roughly $250-$300 per drive at current AU pricing) and you’re looking at roughly $4,600-$5,200 total for a two-site sync deployment with 24TB usable at each location.

Hub-and-Spoke: DS1825+ Hub + DS925+ Spokes

For businesses with three or more sites, designate a Synology DS1825+ ($1,799 at Scorptec) as the hub. Its eight bays, AMD Ryzen V1500B CPU, and 8GB ECC RAM (expandable to 32GB) handle concurrent sync connections from multiple branch sites without bottlenecking. Each branch runs a DS925+ ($995 at Scorptec, $1,029 at Mwave) as a spoke. Syncing a subset of shared folders from the hub.

A three-site deployment in this configuration runs roughly: $1,799 (hub) + 2 x $1,029 (spokes) = $3,857 for NAS hardware. This architecture keeps the branch NAS cost reasonable while giving the hub the capacity and processing headroom to manage multiple sync streams. For offices needing only basic file access with minimal local storage, the DS425+ ($819 at Scorptec, $899 at Mwave) works as a low-cost spoke node. For more on choosing the right NAS for small business, see our dedicated guide.

QNAP Alternative: TS-473A at Each Site

The QNAP TS-473A-8G ($1,369 at Scorptec, $1,489 at PLE) suits multi-site businesses already invested in QNAP’s ecosystem. Four bays, an AMD Ryzen V1500B CPU, 8GB DDR4 RAM (expandable to 64GB), dual 2.5GbE, and two M.2 NVMe slots. More raw hardware than the DS925+ for a similar price, but the sync software is less refined.

QNAP’s HBS 3 handles the site-to-site sync via RTRR jobs. It supports delta sync, compression, and bandwidth scheduling. The trade-off versus Synology Drive ShareSync is a more complex setup process and less seamless desktop client integration. Qsync (QNAP’s equivalent to Synology Drive Client) works on Windows and Mac but lacks the polish of Synology’s implementation.

Where QNAP genuinely excels in a multi-site context is hardware expandability. The TS-473A supports up to 64GB RAM, can add 10GbE via PCIe, and runs virtualisation (Virtualization Station) and containerised apps alongside sync workloads. For businesses that want their NAS to double as a lightweight branch server, QNAP offers more headroom.

Budget Option: DS925+ Pair for Two-Site Offices

For a straightforward two-site deployment where total dataset size is under 16TB, a pair of Synology DS925+ units keeps costs down. At $995-$1,029 each, the total NAS investment is under $2,100. Four bays in RAID 5 gives roughly 12-24TB usable per site depending on drive size. The DS925+ has ECC RAM (4GB, expandable to 32GB), dual 2.5GbE, and full support for Drive ShareSync.

The limitation is bay count. Four bays fills up faster than five, and if both sites need the full dataset plus local backup space, four bays may not be enough. For businesses with smaller datasets. Professional services, legal, accounting. This is often sufficient. For businesses generating large media files or running surveillance alongside file sync, step up to the DS1525+.

Multi-Site NAS Comparison at a Glance

Prices last verified: 28 March 2026. Always check retailer before purchasing.

Failover and Disaster Recovery Across Sites

Multi-site NAS sync inherently provides a disaster recovery layer, but there are levels to how well it protects you.

Level 1. File sync only: Drive ShareSync keeps shared folders in sync across sites. If one NAS fails, the other site has a current copy of all synced files. Staff at the surviving site can continue working immediately. Staff at the failed site need VPN access to the surviving NAS or a temporary cloud-based file share until their NAS is replaced. Replacement timeline in Australia: 2-3 days if the model is in distributor stock, 2-3 weeks if it needs to be ordered from Taiwan.

Level 2. File sync + Active Backup: Run Active Backup for Business on the hub NAS to back up branch NAS units as a secondary protection layer. If a branch NAS fails and the sync copy is corrupted (ransomware, accidental mass deletion), the Active Backup copy on the hub provides a versioned, immutable recovery point. This is materially different from sync alone. Sync propagates deletions and corruption; backups preserve previous states.

Level 3. File sync + Active Backup + cloud: Add a cloud backup target (Backblaze B2, Synology C2, or AWS S3) via Hyper Backup or HBS 3 for a third copy. This covers the scenario where both sites are compromised simultaneously. Unlikely but possible with coordinated ransomware attacks. See our cloud backup guide for Australian-specific options and pricing.

WAN Optimisation Tips for Australian Multi-Site NAS

Getting the most out of limited NBN upload bandwidth requires a few deliberate configuration choices:

1. Enable delta sync. Both Synology Drive ShareSync and QNAP HBS 3 support block-level delta sync. Only the changed portions of files transfer, not the entire file. A 50MB Excel workbook with a single cell change sends kilobytes, not megabytes. Make sure this is enabled (it is by default on both platforms).

2. Schedule bandwidth limits. Both sync tools let you throttle bandwidth by time of day. Allow full upload speed for sync overnight (say, 8PM to 7AM) and throttle to 5-10Mbps during business hours so sync doesn’t compete with VoIP, video calls, and general web traffic.

3. Use compression. Enable in-transit compression for sync jobs. This reduces the actual data transferred over the WAN, particularly effective for text-heavy files like documents, spreadsheets, and PDFs. Less effective for already-compressed formats like JPEG, ZIP, and video.

4. Prioritise sync traffic with QoS. If your router supports Quality of Service rules, assign the NAS sync traffic a priority class that sits below VoIP and video conferencing but above general web browsing. This ensures sync runs in the background without degrading real-time communications.

5. Consider NVMe caching. Both the DS1525+ and TS-473A have M.2 NVMe slots. An SSD read cache accelerates repeated access to recently synced files, reducing wait times for staff accessing newly-arrived sync data. This is particularly noticeable at branch sites where the local NAS is pulling in changes from the hub.

Buying Multi-Site NAS in Australia: Practical Advice

A multi-site NAS deployment means buying two or more identical (or compatible) NAS units. This creates some specific purchasing considerations for Australian buyers.

Request a formal quote. When buying multiple NAS units, always request a quote from Scorptec, PLE, or your preferred specialist retailer. Resellers can request pricing support from their distributor for multi-unit deals. Discounts that never appear on the website but are routinely available for quoted business purchases. A two-NAS order with drives is easily a $5,000+ deal, which puts you in a position to negotiate.

Buy from the same retailer. If one NAS fails under warranty, having both units purchased from the same retailer simplifies the process. The retailer knows your deployment, can expedite a replacement, and may offer an advanced replacement arrangement where you buy a new unit at full price and receive a refund when the faulty unit is returned.

Stock availability matters. Business and rackmount NAS models are rarely held in retailer stock. Even when listed as “in stock,” expect 2-3 days for the retailer to process through their distributor’s dropship arrangement. BlueChip holds the deepest Synology and QNAP stock in Australia, so retailers sourcing from BlueChip (which includes Scorptec and most specialist stores) tend to have the fastest fulfilment. If you need two identical units for a multi-site deployment, confirm both are available before ordering.

Related reading: our NAS buyer's guide.

Use our free NAS Sizing Wizard to get a personalised NAS recommendation.

See also: our NAS for Australian business guide.

Can I sync a Synology NAS to a QNAP NAS across sites?

Not directly using the built-in sync tools. Synology Drive ShareSync only works between Synology NAS units, and QNAP HBS 3 RTRR only syncs between QNAP units. If you need cross-vendor sync, use rsync over SSH. Both platforms support it. However, rsync lacks the polish of the native tools (no desktop client sync, no conflict resolution UI, no versioning) and requires more manual configuration. For a smoother experience, standardise on one vendor across all sites.

How much NBN upload bandwidth does NAS-to-NAS sync actually use?

It depends entirely on how much data changes each day. With delta sync enabled, only the changed portions of files transfer. A typical professional services office (documents, spreadsheets, PDFs) generating 2-5GB of changes per day uses roughly 2-5GB of upload. Which at 20Mbps upload takes about 15-35 minutes. Heavier workloads (design files, video, CAD) can push 20-50GB+ of daily changes, requiring overnight sync windows or higher-tier NBN plans with better upload speeds. Both Synology and QNAP let you schedule sync bandwidth to avoid saturating your connection during business hours.

What happens if the internet goes down at one site during sync?

Both Synology Drive ShareSync and QNAP HBS 3 handle interruptions gracefully. Sync pauses when the connection drops and resumes automatically when it comes back. No data is lost or corrupted. Files that were mid-transfer restart from the last completed block, not from the beginning. Staff at the disconnected site continue working from their local NAS as normal. Changes queue up and sync once connectivity is restored. This is one of the key advantages of local NAS copies over cloud-only sync.

Is multi-site NAS sync a replacement for cloud backup?

No. Sync is not backup. If files are accidentally deleted or encrypted by ransomware at one site, the deletion or encryption syncs to all other sites. Sync propagates changes. Including destructive ones. A proper backup solution (Active Backup for Business on Synology, or HBS 3 backup jobs on QNAP) creates versioned, time-stamped copies that let you roll back to a point before the damage occurred. The ideal multi-site setup includes sync for day-to-day productivity and a separate backup layer for recovery. Adding a cloud backup target (Backblaze B2, Synology C2, AWS S3) via cloud backup provides a third copy for full 3-2-1 compliance.

How long does the initial sync take between two Australian sites?

Over NBN, a long time. At 20Mbps upload, transferring 1TB takes roughly 4.6 days of continuous upload. For a 4TB dataset, that is nearly three weeks. This is why seeding the initial sync over USB is strongly recommended: copy the full dataset to the remote NAS locally, physically transport the NAS to the other site, connect it to the network, then enable Drive ShareSync or HBS 3. After the initial seed, only daily changes (typically a few GB for document-heavy offices) transfer over the WAN, which takes minutes to hours rather than days.

Can I use Tailscale or ZeroTier instead of a traditional VPN for NAS sync?

Yes, and for businesses without dedicated IT staff, overlay VPN tools like Tailscale and ZeroTier are often easier to set up than traditional IPsec or WireGuard tunnels. Both create encrypted mesh networks between devices without requiring port forwarding or static IP addresses. Which also solves the CGNAT problem. Synology supports Tailscale as a community package. QNAP supports it via container. The trade-off is that traffic routes through the overlay network’s relay servers (DERP servers for Tailscale) when direct connections fail, which adds latency. For background file sync, this is rarely an issue. For real-time file access or SMB mounting across sites, a direct WireGuard tunnel provides more consistent performance.

What about latency between Australian cities for NAS sync?

Sydney to Melbourne is typically 10-25ms. Sydney to Brisbane is 20-40ms. Sydney to Perth is 40-65ms. These latencies are irrelevant for background file sync. Drive ShareSync and HBS 3 batch transfer data regardless of latency. Where latency matters is if staff try to access files directly on the remote NAS via SMB or NFS over the VPN, rather than using the local synced copy. At 40-65ms, opening a folder listing on a remote NAS feels sluggish, and opening large files is painful. This is precisely why each site needs its own NAS with a local copy. Staff access files locally and let sync handle the cross-site replication in the background.