Network backup means storing copies of your files on a device connected to your home or office network instead of just on your MacBook's internal drive

A network storage device is a hard drive or box that sits on your Wi-Fi or ethernet network and holds files from multiple computers. When you back up to it, your MacBook copies important files — documents, photos, settings — to that device automatically or on a schedule you set. If your MacBook's drive fails or you lose the computer, those files still exist on the network storage.

The main advantage is that you keep a second copy of everything without needing an external drive you have to plug in manually. The main drawback is that network backups are slower than backing up to a drive connected directly to your MacBook, and they only work when your computer is on the same network as the storage device.

Key Takeaways

  • Network storage devices connect to your Wi-Fi or ethernet network and hold backup copies of files from your MacBook without needing a cable.
  • Time Machine, which comes built into macOS, can back up to network storage if you set it up in System Settings under General > Time Machine.
  • Network storage requires a device like a Synology NAS, QNAP NAS, or a shared drive on another computer, plus the correct network connection type and password.
  • Backups over Wi-Fi take longer than backups over ethernet, so connecting your storage device with a cable produces faster results.
  • Your first backup can take several hours or longer depending on how much data you have and your network speed.

What network storage devices work with MacBook Pro

The most common choice is a NAS (Network Attached Storage) device. These are small boxes that plug into your router with an ethernet cable and hold one or more hard drives inside. Synology and QNAP make the most popular models for home and small office use. A NAS device stays in one place — usually near your router — and your MacBook backs up to it wirelessly or over ethernet.

You can also use a shared folder on another Mac or a Windows computer on your network, or a networked external drive if your router supports it. The simplest option if you already own a second computer is to turn on file sharing on that computer and point your MacBook's backup to its hard drive.

Cloud storage services like iCloud, Dropbox, or Google Drive are not the same as network storage — they store files on the internet rather than on a device in your home. Time Machine, which is macOS's built-in backup tool, does not work with cloud services, only with local network devices.

Setting up Time Machine to back up to network storage

Open System Settings on your MacBook and go to General, then Time Machine. Click "Add Backup Disk" and look for your network storage device in the list that appears. If you do not see it, make sure the device is turned on and connected to the same network as your MacBook.

Select the device and click "Use Disk". If the device requires a password, enter it when prompted. Time Machine will then format the storage space it needs on that device — this erases any existing data on that portion, so make sure you are pointing to the correct device.

Once setup is complete, Time Machine backs up automatically every hour when your MacBook is on the same network. You can also click "Back Up Now" in the Time Machine settings to start a backup when ready. The first backup takes the longest because it has to copy everything; later backups only copy files that changed since the last backup.

Connecting over ethernet versus Wi-Fi

If your network storage device has an ethernet port, connecting it directly to your router with a cable is faster and more reliable than Wi-Fi. Backups over ethernet can run 5 to 10 times faster than over Wi-Fi, depending on your network and the device.

Your MacBook does not need to be connected by ethernet — it can back up over Wi-Fi to a device that is wired to your router. However, if you want the fastest backups, connect your MacBook to ethernet as well. This is most practical if your MacBook stays in one location, like at a desk.

If your MacBook is a laptop you move around, Wi-Fi backup is more convenient even though it is slower. Time Machine will back up whenever your MacBook is on the network, so you do not have to plug in cables.

Understanding backup speed and storage space

How long a backup takes depends on three things: how much data you have, how fast your network is, and whether you are using Wi-Fi or ethernet. A MacBook with 500 GB of files might take 2 to 4 hours over Wi-Fi, or 30 minutes to an hour over ethernet. A MacBook with 1 TB or more can take 8 hours or longer on the first backup.

Time Machine keeps multiple backup copies going back weeks or months, so your network storage device needs to be larger than your MacBook's drive. If your MacBook has a 512 GB drive, a 2 TB or 4 TB network storage device gives you room for several weeks of backups. Time Machine automatically deletes the oldest backups when the device gets full, so you do not have to manage space manually.

After the first backup finishes, later backups are much faster because Time Machine only copies files that changed. If you use your MacBook heavily, expect backups to run for 15 to 30 minutes each time.

Troubleshooting common backup problems

If your MacBook does not see the network storage device, check that both devices are on the same network and that the storage device is turned on. Restart your MacBook and the storage device, then try adding the backup disk again. If you are using Wi-Fi, move closer to your router or switch to ethernet if possible.

If backups keep stopping or failing, check your network connection — a weak Wi-Fi signal or a network interruption will pause the backup. Time Machine resumes automatically when the connection is stable again. If backups fail repeatedly, restart your MacBook and the storage device, and check that you entered the correct password for the network storage.

If your network storage device is full, Time Machine cannot add new backups. Check how much space is left on the device and delete old backups if you need room, or replace the device with a larger one. You can see how much space Time Machine is using by opening Time Machine settings and looking at the storage information.

Backing up to a shared folder on another Mac

If you have a second Mac or a Windows computer on your network, you can turn on file sharing and use that computer's hard drive as a backup destination. On the Mac you want to back up from, open System Settings, go to General > Time Machine, and click "Add Backup Disk". Look for the other computer's name in the list.

The computer you are backing up to must have file sharing turned on. On that Mac, open System Settings, go to General > Sharing, and turn on File Sharing. Make sure your backup Mac has permission to access the shared folder. This method is slower than using a dedicated NAS device, but it works if you already have a second computer you leave running.

Frequently Asked Questions

Can I back up to network storage while my MacBook is asleep?

No. Time Machine only backs up when your MacBook is awake and on the network. If you want automatic backups, keep your MacBook on or set it to not sleep while plugged in. You can also manually start a backup by clicking "Back Up Now" in Time Machine settings whenever you want.

What happens if I unplug the network storage device during a backup?

The backup stops and Time Machine marks it as incomplete. When you plug the device back in and your MacBook reconnects to the network, Time Machine resumes the backup from where it left off. You do not have to start over.

Can I use the same network storage device to back up multiple Macs?

Yes. Most NAS devices and shared folders support backups from several computers at once. Each Mac gets its own backup folder on the device, so they do not interfere with each other. Make sure the device has enough total storage for all the Macs you plan to back up.

Is network backup as safe as keeping an external drive in a different location?

Network backup protects you from drive failure and accidental deletion, but not from fire or theft if the storage device is in the same building as your MacBook. For the best protection, keep one backup on network storage and one external drive in a different location.

Do I need to buy a NAS device, or can I use an old external hard drive?

An old external drive connected to your router with a USB adapter can work as network storage, but it is slower and less reliable than a NAS device designed for that purpose. A basic NAS device costs less than many external drives and is built to run continuously without overheating.