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   Back up your Mac with Time Machine - Apple Support
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itemtype=http://schema.org/Organization><meta content=Apple itemprop=name></div><div id=sections itemprop=articleBody><div><div id=backup><p>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. <a href=https://support.apple.com/kb/HT203981> Learn how to restore your Mac from a backup </a> .</div></div><div><h2 id=timemachine>Create a Time Machine backup</h2><div><p>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.</div><div><h3 id=storagedevice>Connect an external storage device</h3><div><p>Connect one of the following external storage devices, sold separately. <a href=https://support.apple.com/kb/HT202784> Learn more about backup disks that you can use with Time Machine </a> .<ul><li>External drive connected to your Mac, such as a USB or Thunderbolt drive<li>Network-attached storage (NAS) device that supports Time Machine over SMB<li>Mac shared as a Time Machine backup destination<li>AirPort Time Capsule, or external drive connected to an AirPort Time capsule or AirPort Extreme Base Station (802.11ac)</ul></div></div><div><h3 id=setup>Select your storage device as the backup disk</h3><div><ol><li>Open Time Machine preferences from the Time Machine menu <img alt src=/library/content/dam/edam/applecare/images/en_US/macos/Big-Sur/macos-big-sur-tm-idle-icon.png width=22>  in the menu bar. Or choose Apple menu  > System Preferences, then click Time Machine.<li>Click Select Backup Disk.</ol><p><img alt="macOS System Preferences Time Machine window"src=/library/content/dam/edam/applecare/images/en_US/macos/Big-Sur/macos-big-sur-system-prefs-tm.jpg width=600></div></div><div><h3>Enjoy the convenience of automatic backups</h3><div><p>After you select a backup disk, Time Machine immediately begins making periodic backups—automatically and without further action by you. The first backup may <a href=https://support.apple.com/kb/HT204412> take a long time </a> , 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.<p>To start a backup manually, choose Back Up Now from the Time Machine menu <img alt src=/library/content/dam/edam/applecare/images/en_US/macos/Big-Sur/macos-big-sur-tm-idle-icon.png width=22>  in the menu bar. Use the same menu to check the status of a backup or skip a backup in progress.</div></div></div><div><div><p><br> <img alt src=/library/content/dam/edam/applecare/images/en_US/mac_apps/itunes/divider.png></div></div><div><h2>Learn more</h2><div><ul><li>Learn about <a href=https://support.apple.com/kb/HT209174> other ways to back up and restore files </a> .<li>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.<li>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.<li>If using Time Machine to back up to a network disk, you can verify those backups to make sure they're in good condition. 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