The Transition from Apple Time Capsule
For years, Apple sold the AirPort Time Capsule—a Wi-Fi router with an integrated hard drive designed specifically to provide seamless, wireless Time Machine backups for every Mac in a household or small office. However, Apple officially discontinued the Time Capsule hardware in 2018.
Since then, many users have reverted to plugging direct-attached USB external drives into their Macs. While functional, this defeats the primary advantage of Time Machine: automated, invisible backups. If a user forgets to plug in the USB drive for three weeks and their logic board fails, the data is lost.
Fortunately, you do not need an Apple-branded router to achieve wireless backups. macOS Time Machine natively supports backing up to any Server Message Block (SMB) network share. You can configure a Windows Server, a Linux Raspberry Pi, a Synology NAS, or even another Mac to act as a centralized, wireless Time Machine backup destination for your entire network.
Step 1: Requirements for the SMB Server
Time Machine relies heavily on specific extensions to the SMB protocol to ensure data integrity during wireless transfers. Specifically, your SMB server must support F_FULLFSYNC (to guarantee data is flushed to the physical disk before acknowledging the write) and Apple’s Bonjour zero-configuration networking (for auto-discovery).
If you are building your own Linux Samba server, your smb.conf file must include the vfs objects = fruit streams_xattr directive to enable Apple-specific SMB extensions.
Step 2: Preparing the Shared Folder
On your chosen server (e.g., a TrueNAS box, Windows Server, or Synology NAS), create a dedicated shared folder named TimeMachineBackups.
Critical Security Note: You must create a dedicated user account (e.g., tm_user) with a strong password solely for this share. Do not use your primary administrator account. If your Mac is compromised by ransomware, and your Time Machine share is mapped using your daily credentials, the ransomware will traverse the network and encrypt your backups.
Step 3: Restricting Quotas (Essential)
By default, Time Machine is designed to consume 100% of the available free space on the destination drive before it begins deleting the oldest backups. If you point Time Machine to a 10TB network share, it will eventually consume all 10TB.
To prevent a single Mac from consuming your entire NAS, you must enforce a storage quota on the server side. Depending on your server, this is done by setting a dataset quota (ZFS), a user quota (Windows/Linux), or a dedicated volume size. A good rule of thumb is to set the quota to 2.5x the size of the Mac’s internal drive (e.g., a 1TB quota for a 512GB MacBook).
Step 4: Connecting macOS to the SMB Share
Now you must instruct your Mac to locate and authenticate with the network share.
- Open the Finder on your Mac.
- From the top menu bar, click Go > Connect to Server (or press
Cmd+K). - In the Server Address field, type the SMB URL using either the IP address or hostname of your server. Example:
smb://192.168.1.50/TimeMachineBackups. - Click Connect.
- When prompted, enter the dedicated
tm_usercredentials you created in Step 2. Crucially, check the box to Remember this password in my keychain. If you do not save it to the keychain, automated backups will fail when you reboot.
Step 5: Configuring Time Machine
With the network share successfully mounted in the Finder, you can now designate it as a backup destination.
- Open System Settings and navigate to General > Time Machine.
- Click Add Backup Disk.
- macOS will scan for available drives. Because the SMB share is actively mounted and supports the necessary protocols, it will appear in the list (often with a green icon).
- Select the network share and click Set Up Disk.
- You will be prompted to encrypt the backup. Always encrypt network backups. Since the data resides on a remote server, encrypting the backup payload ensures that even if the server admin reads the raw files, your personal data is protected by a strong cryptographic password.
Step 6: Monitoring the Initial Backup
The first backup over Wi-Fi will take a significant amount of time, as it must transfer the entire contents of your Mac. Ensure your Mac is connected to power. Time Machine handles network interruptions gracefully; if you close your MacBook and leave the house, the backup will pause and seamlessly resume the next time you connect to the home Wi-Fi network.
Conclusion
Automated, wireless backups are the only reliable way to ensure endpoint data recovery. By leveraging native SMB network shares, you can bypass the need for direct-attached storage or obsolete Apple router hardware, allowing you to centralize and secure macOS Time Machine backups on robust, enterprise-grade storage infrastructure.