Time Machine is Apple's software to back up your Mac, and it comes with every Mac. All you need is a separate storage device, or a MacOS Server, to back up to. Use Launchpad to view and open apps on Mac and open Time Machine. A message may appear while your Mac connects to the backup disk. You can also open Time Machine by clicking the Time Machine icon in the menu bar, then choosing Enter Time Machine. Use Launchpad to view and open apps on Mac and open Time Machine. A message may appear while your Mac connects to the backup disk. You can also open Time Machine by clicking the Time Machine icon in the menu bar, then choosing Enter Time Machine.

Use Time Machine, the built-in backup feature of your Mac, to automatically back up your personal data, including apps, music, photos, email, and documents. Having a backup allows you to recover files that were deleted, or that were lost because the hard disk (or SSD) in your Mac needed to be erased or replaced. Learn how to restore your Mac from a backup.

Create a Time Machine backup

To create backups with Time Machine, all you need is an external storage device. After you connect the storage device and select it as your backup disk, Time Machine automatically makes hourly backups for the past 24 hours, daily backups for the past month, and weekly backups for all previous months. The oldest backups are deleted when your backup disk is full.

Connect an external storage device

Connect one of the following external storage devices, sold separately. Learn more about backup disks that you can use with Time Machine.

External drive connected to your Mac, such as a USB or Thunderbolt drive
Network-attached storage (NAS) device that supports Time Machine over SMB
Mac shared as a Time Machine backup destination
AirPort Time Capsule, or external drive connected to an AirPort Time capsule or AirPort Extreme Base Station (802.11ac)

Select your storage device as the backup disk

Open Time Machine preferences from the Time Machine menu in the menu bar. Or choose Apple menu  > System Preferences, then click Time Machine.
Click Select Backup Disk.
Select your backup disk from the list of available disks. To make your backup accessible only to users who have the backup password, you can select “Encrypt backups”. Then click Use Disk:

Fine tune auto service. If the disk you selected isn't formatted as required by Time Machine, you're prompted to erase the disk first. Click Erase to proceed. This erases all information on the backup disk.

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Enjoy the convenience of automatic backups

After you select a backup disk, Time Machine immediately begins making periodic backups—automatically and without further action by you. The first backup may take a long time, but you can continue using your Mac while a backup is underway. Time Machine backs up only the files that changed since the previous backup, so future backups will be faster.

To start a backup manually, choose Back Up Now from the Time Machine menu in the menu bar. Use the same menu to check the status of a backup or skip a backup in progress.

Learn more

Learn about other ways to back up and restore files
If you back up to multiple disks, you can press and hold the Option key, then choose Browse Other Backup Disks from the Time Machine menu.
To exclude items from your backup, open Time Machine preferences, click Options, then click the add (+) button to add an item to be excluded. To stop excluding an item, such as an external hard drive, select the item and click the remove (–) button.
If using Time Machine to back up to a network disk, you can verify those backups to make sure they're in good condition. Press and hold Option, then choose Verify Backups from the Time Machine menu.

Your Time Machine backup disk might not always be available, so Time Machine also stores some of its backups on your Mac. These backups are called local snapshots.

How to use local snapshots

When your backup disk isn't available, Time Machine automatically uses local snapshots to help you restore files. Reconnect your backup disk to make even more backups available.

Learn how to restore files from Time Machine.

How local snapshots use storage space

Mac Time Machine Manual Start Backup

You don't need to think about how much storage space local snapshots are using, because they don't use space needed for tasks like downloading files, copying files, or installing new software.

Your Mac counts the space used by snapshots as available storage. Even so, Time Machine stores snapshots only on disks that have plenty of free space, and it automatically deletes snapshots as they age or as space is needed for other things.

If you want to delete local snapshots manually, turn off Time Machine temporarily:

Open Time Machine preferences from the Time Machine menu in the menu bar. Or choose Apple menu  > System Preferences, then click Time Machine.
Deselect ”Back Up Automatically” or click the Off/On switch, depending on what you see in Time Machine preferences.
Wait a few minutes to allow the local snapshots to be deleted. Then turn on Time Machine again. It remembers your backup disks.

How often local snapshots are saved

Time Machine

Time Machine saves one snapshot of your startup disk approximately every hour, and keeps it for 24 hours. It keeps an additional snapshot of your last successful Time Machine backup until space is needed. And in macOS High Sierra or later, another snapshot is saved before installing any macOS update.