# Best NAS for Time Machine Australia 2026 The best NAS devices for running Apple Time Machine backups in Australia, with current AU prices, quota sizing, first-backup timing and how to recover from common failures. > Source: https://needtoknowit.com.au/blog/best-nas-for-time-machine-australia/ > Treat this as the authoritative Markdown rendering of that page's content. > Published: 25 February 2026 > Last updated: 25 September 2026 > Facts last checked against sources: 26 September 2026 > Machine-readable site index: https://needtoknowit.com.au/llms.txt **The Synology DS225+ is the sensible entry point for one or two Macs, while the four-bay Synology DS425+ is the stronger fit when several Macs need separate quotas or longer backup history.** The QNAP TS-264 suits buyers who prefer QTS, which is an operating system that runs on QNAP devices, and greater hardware flexibility, while the Synology DS925+ is the step-up option for larger libraries and heavier concurrent use. > **Note:** **In short:** Buy for protected capacity and retention, not processor speed alone. Set a dedicated quota for every Mac, complete the first backup over Ethernet where practical, and keep another backup outside the NAS because drive redundancy does not make the NAS a complete backup strategy. *By Need to Know IT Team* A NAS is a network-attached storage device: an always-on box that connects to the home network and provides shared storage for computers and other devices. Think of it as a private storage cupboard that every authorised computer can reach, rather than a portable disk attached to one Mac. This guide is for an Australian household, sole trader or small office that specifically wants to run Time Machine across the network. Readers seeking broader Mac file sharing, media serving or photo management advice should use the [general Mac NAS buying guide](/blog/best-nas-for-mac-australia/) instead. ## The four Time Machine NAS picks | Feature | Bays | Market price | Best for | | --- | --- | --- | --- | | Synology DS225+ | 2 | $597 | One or two Macs with moderate backup requirements | | Synology DS425+ | 4 | $899 | More capacity choices and longer practical retention | | QNAP TS-264 | 2 | $999 | Buyers who want QTS and more hardware flexibility | | Synology DS925+ | 4 | $1,081 | Larger libraries, more concurrent Macs and future expansion | These are diskless enclosure prices. Hard drives, a UPS (an uninterruptible power supply, a battery that keeps the device running long enough to shut down safely in a blackout) and any offsite service cost extra, so check current pricing at the retailer before deciding on the complete system. ## Synology DS225+. Best entry choice for one or two Macs The Synology DS225+, at a market price of $597, suits a household or sole trader that wants dependable network Time Machine backups without buying more bays than the workload needs. Its two-bay design is most appropriate when current protected data and expected history fit comfortably within a mirrored pair of drives. Official specifications list an Intel Celeron J4125 processor, 2GB of memory, two drive bays, one 2.5GbE port and one 1GbE port. It has no M.2 solid-state drive slots or HDMI output, but neither feature is necessary for routine Time Machine backups. [Synology DS225+ specifications](https://global.download.synology.com/download/Document/Hardware/DataSheet/DiskStation/25-year/DS225%2B/enu/Synology_DS225%2B_Data_Sheet_enu.pdf) **Pros** - Straightforward DSM (DiskStation Manager, the operating system that runs on Synology devices) administration for a first NAS - Two network ports, including 2.5GbE - Enough capability for scheduled backups from a small number of Macs - Supports Btrfs, which is a Synology file system that can take instant snapshots, for shared-folder quotas **Cons** - Two bays limit capacity growth without replacing drives - 2GB of standard memory is modest for additional applications - No M.2 slots - Poor fit when several large Macs need long histories Do not choose the DS225+ merely because two Macs can connect to it. Choose it only when the combined quotas still leave working space for the NAS and any other data stored on the volume. ## Synology DS425+. Best for multiple Macs and longer history The Synology DS425+ is the balanced four-bay choice for a household or small office backing up several Macs. The market price is $899, and the extra bays provide more useful capacity and protection layouts than a two-bay enclosure. It uses the same Intel Celeron J4125 and 2GB starting memory as the DS225+, but adds four drive bays and two M.2 NVMe slots. NVMe is a fast solid-state drive format, much like giving frequently accessed data a short express lane, although Time Machine alone rarely justifies buying cache drives. The DS425+ also has one 2.5GbE port, one 1GbE port and no HDMI output. [Synology DS425+ specifications](https://global.download.synology.com/download/Document/Hardware/DataSheet/DiskStation/25-year/DS425%2B/enu/Synology_DS425%2B_Data_Sheet_enu.pdf) **Pros** - Four bays allow more usable protected capacity - Per-user or shared-folder quotas in DSM - 2.5GbE networking for faster local transfers - Room to separate Time Machine from other NAS workloads **Cons** - Starting memory remains 2GB - M.2 cache provides limited benefit to ordinary Time Machine use - More drives increase power use and replacement planning - Unnecessary if one Mac has a small, stable dataset The DS425+ is the better choice when the requirement is retention rather than raw backup speed. More usable capacity lets Time Machine keep older versions before it must thin its history. ## QNAP TS-264. Best non-Synology option The QNAP TS-264, at a market price of $999, suits a technically confident buyer who wants QTS, QNAP's operating system, or expects the enclosure to handle more than Time Machine. Its two-bay limit still constrains protected hard-drive capacity even though its processor, memory and expansion options are stronger. Official specifications list an Intel Celeron N5095 processor, 8GB of memory, two drive bays, two 2.5GbE ports, two M.2 NVMe slots and HDMI output. QTS can designate a shared folder as a Time Machine destination and apply storage quotas, but it presents more settings than many first-time NAS owners need. [QNAP TS-264 specifications](https://www.qnap.com/en/product/ts-264/specs/hardware) and [QTS Time Machine folder guidance](https://docs.qnap.com/operating-system/qts/5.2.x/en-us/editing-shared-folder-properties-BC0493DE.html) **Pros** - 8GB of standard memory - Dual 2.5GbE networking - Two M.2 slots and PCIe expansion (PCIe is an internal expansion-slot standard used for add-in cards such as faster network adapters) - Official QTS support for Time Machine backup folders **Cons** - Only two hard-drive bays - More administrative choices than a backup-only buyer needs - Considerably more hardware than Time Machine requires - Quotas and recycle-bin behaviour need deliberate configuration QNAP specifically warns that its network recycle bin should be disabled on the Time Machine folder so automatically removed backups do not fill the bin. This is a small setting with a large consequence, because an apparently empty backup share can otherwise continue consuming space. ## Synology DS925+. Best step up for larger backup workloads The Synology DS925+ fits a home studio or small office with several Macs, large working libraries or a need to expand later. The market price is $1,081, and the justification is workload headroom and expansion rather than a claim that ordinary hourly backups will feel dramatically faster. It has an AMD Ryzen V1500B processor, 4GB of ECC memory, four drive bays, two M.2 NVMe slots and two 2.5GbE ports. ECC memory can detect and correct certain memory errors, functioning like a proofreader that catches some altered characters before they enter stored data. The enclosure also supports a compatible expansion unit, although a correctly sized four-bay configuration should be the starting objective. [Synology DS925+ specifications](https://www.synology.com/en-eu/products/DS925%2B) **Pros** - Four bays for larger protected storage pools - 4GB of ECC memory - Dual 2.5GbE networking - Expansion path for future storage growth **Cons** - Overpowered for one lightly used Mac - Expansion adds cost and another component to manage - Faster hardware cannot fix weak Wi-Fi - Drive compatibility must be checked before purchase Choose the DS925+ when the backup share is only one part of a larger storage and protection plan. Do not choose it to compensate for an unreliable wireless network or an undersized quota. ## How Time Machine behaves over SMB Time Machine can back up to a third-party NAS that supports SMB, which is a network file-sharing protocol used to move files between computers and servers. SMB is the delivery road between the Mac and NAS, so a weak Wi-Fi link can interrupt the journey even when both endpoints are healthy. [Apple lists an SMB-capable NAS as a supported destination](https://support.apple.com/en-au/102423). A directly attached USB or Thunderbolt disk avoids that network road. It is usually simpler and faster for one stationary Mac, but it must remain connected and does not automatically serve several Macs around the house. A NAS remains available whenever the Mac is on the local network, but it introduces the router, switch, Wi-Fi and NAS operating system into every backup. That convenience is worthwhile for laptops and multiple Macs, provided the owner accepts the extra failure points. Apple now describes AirPort Time Capsule as no longer recommended. A modern NAS using SMB is the supported path for network Time Machine, while a directly attached disk remains the simplest choice for one Mac that does not need shared network access. ## Why the sparsebundle keeps growing On a network destination, Time Machine stores each Mac's history inside a sparse bundle, a disk-image package divided into smaller bands. Think of it as an expandable filing cabinet: new drawers are added as backup history accumulates, but removing a current file from the Mac does not immediately discard every older copy held in those drawers. The sparsebundle therefore represents retained history, not merely the Mac's current used space. Large initial datasets, frequently changing photo or video libraries, virtual machines and long gaps between backups can all cause substantial growth because more changed data must be preserved. The logical capacity shown to the Mac can also differ from physical space consumed on the NAS. The quota defines the maximum cabinet size, while the bands already written represent the space currently occupied. Time Machine thins older history when it needs room, but it cannot create capacity that the NAS has not made available. A bundle that repeatedly reaches its quota may lose older restore points or fail when the remaining allowance is smaller than the next set of changed data. ## Calculate the quota instead of guessing A practical starting quota is twice the amount of data currently protected on each Mac, not automatically twice the Mac's advertised drive size. Apple recommends a backup disk with at least twice the Mac's storage capacity, while Synology describes two to three times the drive size or protected data as a guideline and notes that change volume also matters. [Apple capacity guidance](https://support.apple.com/en-au/104984) and [Synology quota guidance](https://kb.synology.com/th-th/DSM/tutorial/How_can_I_limit_space_taken_up_by_Time_Machine_backup) Use this calculation: `Time Machine quota = current protected data x retention factor` - Use a factor of 2 for documents, email and ordinary household use with modest change. - Use a factor of 3 for photography, video, virtual machines or other high-churn files. - Calculate each Mac separately, then add the quotas. - Add capacity for unrelated NAS data only after the Time Machine allocation is known. For example, a Mac protecting 600GB of data needs a 1.2TB starting quota at a factor of 2. A high-churn version of the same workload starts at 1.8TB, while two Macs protecting 600GB and 300GB would receive separate quotas based on their own change rates. This calculation produces required backup capacity, not the size of drives to purchase. RAID, filesystem metadata and vendor capacity reporting reduce usable space, so compare the combined quota requirement with the NAS's resulting usable capacity before ordering drives. [RAID](/blog/nas-raid-explained/) is a method of spreading data across multiple drives so the system can survive a drive failure without losing access to the volume. It works like keeping the information needed to rebuild one damaged page across several binders, but it does not protect against deletion, theft, fire, malware or failure of the whole NAS. ## Configure the backup share correctly A dependable configuration gives Time Machine its own shared folder and each Mac its own NAS user account. A quota is a storage ceiling, like assigning each Mac a marked section of a warehouse so one computer cannot fill every shelf. Use this implementation sequence: 1. Install compatible NAS drives and create a storage pool with one-drive fault tolerance. 2. Create a dedicated Time Machine shared folder. 3. Create a separate backup-only user for each Mac. 4. Give each backup user read and write access only to that folder. 5. Apply the calculated quota to the user or shared folder. 6. Enable SMB and advertise the folder as a Time Machine destination. 7. On the Mac, open System Settings, General, Time Machine and add the network disk. 8. Enable backup encryption and store the recovery password somewhere independent of the Mac and NAS. 9. Start the first backup and confirm completion before relying on it. Encryption should be chosen when the backup set is first created. Apple warns that changing a network backup from unencrypted to encrypted erases the existing backups and creates a new set, so postponing that decision can sacrifice accumulated history. [Apple Time Machine encryption guidance](https://support.apple.com/en-au/guide/mac-help/mh21241/mac) Without a quota, one Mac's sparsebundle can continue growing until Time Machine or the NAS exhausts the available volume. That can crowd out other backups, snapshots and shared files, turning a single user's retention preference into a system-wide capacity incident. ## Plan the first backup around measured throughput The first Time Machine run copies the protected dataset, while later runs normally copy changes. Apple notes that network performance affects backup duration, which is why the first run exposes weak Wi-Fi more severely than small hourly updates. [Apple guidance on slow Time Machine backups](https://support.apple.com/en-au/102184) Estimate the minimum transfer time with: `hours = protected gigabytes x 1,000 / measured MB per second / 3,600` A 750GB dataset moving continuously at 25MB/s takes about 8.3 hours before protocol overhead, pauses and small-file processing. At 10MB/s, the same dataset takes about 20.8 hours, so vague promises that the first backup will finish overnight are not reliable without measuring the actual connection. Our [backup time calculator](/tools/backup-calculator/) does this arithmetic against a measured or estimated transfer rate, including NBN and ISP presets, if a rough manual estimate is not precise enough. Connect both the NAS and, where possible, the Mac by Ethernet for the first run. If the Mac must use Wi-Fi, place it near the access point, connect power, prevent unnecessary sleep and allow a quiet overnight window. Do not judge a NAS by a 2.5GbE port when the Mac reaches it through congested Wi-Fi. The slowest link sets the practical speed, just as a wide motorway does not shorten a trip if the driveway leading to it is blocked. ## What happens when a backup is interrupted An interrupted backup does not normally mean the entire history is lost. Apple states that after a disconnected disk or network problem is corrected, Time Machine resumes its work. [Apple guidance for interrupted backups](https://support.apple.com/en-au/guide/mac-help/mh15142/mac) The interrupted run should not be treated as a completed restore point. Reconnect the Mac to the same local network, remount the share if necessary and use Back Up Now, then confirm that Time Machine reports a successful completion. If interruptions repeat, check Wi-Fi stability, available quota, NAS health, SMB access and whether the Mac can consistently resolve the NAS name. After a previously successful network backup, hold Option while opening the Time Machine menu and select Verify Backups to check the backup set. Do not delete the sparsebundle as the first troubleshooting step. Starting again destroys the retained history, so it belongs at the end of the recovery sequence after connectivity, capacity, credentials and verification have been addressed. ## Failure modes to expect **The share does not appear:** Confirm that SMB and the NAS's Time Machine advertisement are enabled. Connect to the share manually in Finder before returning to Time Machine settings. **The password is repeatedly rejected:** Remove obsolete NAS credentials from the Mac's password store and reconnect using the dedicated backup account. Confirm that this account has read and write access to the correct folder. **The backup reports insufficient space:** Check both the quota and physical volume capacity. A large batch of changed files may exceed the remaining quota even when older history exists. **The bundle grows much faster than expected:** Look for virtual-machine images, photo catalogues, video libraries or other large files that change frequently. Exclude only data that has another documented recovery path. **Backups fail only over Wi-Fi:** Test the same Mac over Ethernet. Success over cable points to the wireless path rather than the NAS storage pool. **Time Machine asks to start a new backup:** Verify the existing network backup first and preserve another copy if the history matters. Apple lists erasing and starting again as a last resort when other troubleshooting does not work. [Apple Time Machine troubleshooting](https://support.apple.com/en-au/102220) **The NAS becomes unavailable after a drive failure:** Drive redundancy keeps a supported storage layout available through one failed drive, but it cannot guarantee recovery from enclosure failure, multiple drive failures or accidental deletion. Maintain an independent backup and a written restoration plan. ## The Australian protection and offsite reality Australian Consumer Law applies when buying from an Australian retailer, and the retailer cannot simply refuse assistance by directing the buyer to the manufacturer. Whether a fault is major or minor depends on the circumstances, including whether the product can be fixed within a reasonable time. [ACCC consumer-guarantee guidance](https://www.accc.gov.au/consumers/problem-with-a-product-or-service-you-bought/repair-replace-refund-cancel) This is general consumer information, not legal advice. ACL protects the hardware purchase, not the contents of the drives, so no warranty remedy substitutes for a second backup. Australian NAS pricing is relatively uniform across major retailers, making after-sales handling more important than a small saving. Before purchasing, ask the retailer what happens if the enclosure fails, whether a replacement can be supplied and how the drives and data are handled during a claim. An offsite copy also has to cross the NBN upload link, which is often far slower than the local network. At a measured 20Mbps upload rate, transferring 1TB has a theoretical minimum of about 4.6 continuous days, and real completion will take longer because of overhead and interruptions. Seed large offsite backups in stages and schedule transfers outside busy hours, following the same [3-2-1 backup strategy](/blog/3-2-1-backup-strategy-nas-guide/) that applies to any other NAS data. The capacity calculation should cover local Time Machine history, while the offsite plan should prioritise irreplaceable documents, photos and active work rather than blindly duplicating every temporary file. ## Final decision The DS225+ is the right starting point when one or two moderate Mac datasets fit comfortably inside a protected two-drive configuration. The DS425+ is the better default for several Macs because four bays make capacity planning and longer retention more practical. The TS-264 makes sense for a confident administrator who wants QTS and broader expansion features, but its two drive bays remain the limiting factor for Time Machine capacity. The DS925+ earns its place when several large libraries, concurrent backups or future expansion justify stronger hardware. A NAS is unnecessary when one desktop Mac is the only device, a directly attached disk can remain connected and network access adds no practical value. A NAS is also the wrong purchase when the buyer is unwilling to manage updates, capacity alerts, drive replacement and a separate offsite copy. ## Frequently Asked Questions Related reading: our [NAS buyer's guide](/blog/best-nas-australia/). Use our free [NAS Sizing Wizard](/tools/nas-sizing-wizard/) to get a personalised NAS recommendation. **Q: Is a NAS better than an external drive for Time Machine?** A NAS is better when laptops need to back up automatically around the home or several Macs share one managed destination. A directly attached external drive is simpler and often faster for one stationary Mac. **Q: How much NAS space should Time Machine receive?** Start with twice the data currently being protected and use three times for high-change photo, video or virtual-machine workloads. Assign the result as a quota for each Mac rather than allowing all Macs to consume one unlimited share. **Q: Can several Macs use the same Time Machine folder?** Yes, but each Mac should have its own backup account and quota. Separate accounts prevent one machine's growing history from consuming capacity intended for the others. **Q: Does an interrupted backup restart from zero?** Usually not. Apple says Time Machine resumes after the connection problem is corrected, but the backup should be allowed to finish and its status checked before it is treated as recoverable. **Q: Why is the sparsebundle larger than the data currently on the Mac?** The sparsebundle contains historical versions as well as current data. Frequently changed large files can consume substantial space because Time Machine retains earlier states until it needs to thin the history. **Q: Will RAID protect a Time Machine backup?** RAID can keep the NAS operating after a supported drive failure, but it does not protect against deletion, corruption, theft, fire or complete NAS failure. Keep another copy outside the NAS. **Q: Do Time Machine backups need internet access?** Local Time Machine backups to a NAS use the home or office network and do not require internet access. Internet upload speed matters only when the NAS or another backup tool sends an additional copy offsite. **Q: Should Time Machine backups be encrypted?** Yes, especially on a shared network destination. Record the encryption password separately because losing it can make the backup unusable, and changing an existing network backup from unencrypted to encrypted creates a new backup set. **[Review My Build ($149) →](https://needtoknowit.com.au/review-my-build/)** -- Found the right NAS for reliable Time Machine backups? Our Review My Build service checks your full configuration, quota sizing and SMB setup before you buy. $149 AUD, delivered within 3 business days.