Mac User Guide
- Welcome
- What’s new in macOS Sequoia
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- Intro to Continuity
- Use AirDrop to send items to nearby devices
- Hand off tasks between devices
- Control your iPhone from your Mac
- Copy and paste between devices
- Stream video and audio with AirPlay
- Make and receive calls and text messages on your Mac
- Use your iPhone internet connection with your Mac
- Share your Wi-Fi password with another device
- Use iPhone as a webcam
- Insert sketches, photos and scans from iPhone or iPad
- Unlock your Mac with Apple Watch
- Use your iPad as a second display
- Use one keyboard and mouse to control Mac and iPad
- Sync music, books and more between devices
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- Control what you share
- Set up your Mac to be secure
- Allow apps to see the location of your Mac
- Use Private Browsing
- Keep your data safe
- Understand passwords
- Change weak or compromised passwords
- Keep your Apple Account secure
- Use Mail Privacy Protection
- Use Sign in with Apple for apps and websites
- Find a missing device
- Resources for your Mac
- Resources for your Apple devices
- Copyright
Use Time Machine on your Mac to back up to multiple disks
For extra security and convenience, you can back up to multiple disks. If you work in two locations, you may want to keep backup disks in both places.
Time Machine rotates the backup schedule among the disks. For each disk, Time Machine backs up everything that’s changed since the last time that disk was used. If you designated items that shouldn’t be backed up, the list of excluded items applies to all backup disks.
If you use multiple backup disks, you can see timelines for all disks or for an individual disk.
To see a timeline for all backup disks: Click 
in the menu bar, then choose “Browse Time Machine backups”.
To see the timeline for a specific backup disk: Click in the menu bar, press the Option key, then choose Browse Other Backup Disks.
If the Time Machine icon isn’t in the menu bar, choose Apple menu 
in the sidebar, scroll down to Time Machine , then select “Show in Menu Bar” from the pop-up menu.
Note: If you create a backup on a Mac or partition with macOS 12 or later, you can only use that backup on Mac computers or partitions with macOS 11 or later.