Apple's built-in Time Machine app makes it simple to back up data on your Mac. You can use the same external hard drive to back up multiple Macs if you wish. Here are the two main ways to do this.

Great backup drives

How it's done

When you use an external hard drive to back up different Macs, Time Machine automatically creates separate folders, one for each computer. If you ever need to restore data from the hard drive on any of your Macs, Time Machine will know the files that match the specific computer.

To back up different Macs using Time Machine, you can:

Do it manually

Perhaps the simplest way is to attach the drive to one Mac, let Time Machine run a backup, then disconnect the drive and repeat the steps on another Mac. In each case, Time Machine works behind the scenes to get the job done.

The drawback to this approach is that you manually have to connect and disconnect the hard drive to each computer. Still, as long as you set up Time Machine on each Mac, you're good to go.

Use networking

A second solution is to share your backup drive using Personal File Sharing on macOS. In doing so, computers connected to the same network can use the same drive with Time Machine.

  1. Open System Preferences on the computer which is connected to the hard drive.
  2. Click on Sharing.

    sharing Mac

  3. Check the box next to File Sharing.
  4. Click on the + button under Shared Folders to share specific folders. In this case, share the external hard drive.
  5. Click on the Everyone user under Users.
  6. To the right of Everyone, change the permissions from Read-Only to Read & Write.

    sharing Mac

  7. On another computer on your network, open a window in the Finder.
  8. Scroll down the sidebar until you see Shared.
  9. Select the Mac you'd like to access. In this case, select the shared hard drive.
  10. If you are required to log in, you may see a button labeled Connect As....

Once the hard drive is shared successfully, you can set up Time Machine backup on your Mac. Repeat these steps on other Macs on your network.

Our top equipment pick

There are countless hard drives available that support Apple's Time Machine app for backup purposes. These three are among the best on the market.

Ideal for most users

G-Technology G-Drive 1TB

Durable, colorful accessory

USB-C ready plus USB 3.0 and Thunderbolt 3 compatible, this stylish drive from G-Technology is lightweight and Mac ready.

Also available with 2TB and 4TB, G-Technology's G-Drive is one of the easiest drives to use for backup. Just plug it in, and you're halfway there! It's available in silver, space gray, and rose gold.

Other options

The following hard drives are also among our favorites for 2019.

SanDisk Extreme Portable External 250B, 500GB, 1TB, 2TB (starting at $73 at Amazon)

This product proves that even hard drives can be beautiful.

LaCie Porsche Design 1TB, 2TB, 4TB (starting at $90 at Amazon)

LaCie is well known for its backup devices; this is one of the most popular on the market.

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