Self HelpBoise Computer Care

Mac

Back up a Mac with Time Machine

Set up Time Machine on a Mac in 15 minutes: pick a drive, encrypt it, finish the first backup, and test a restore.

Difficulty
Easy
Time
15 min setup + first backup
Steps
7
Updated

Sounds like this?

  • Never backed up your Mac
  • Want an automatic backup
  • Getting a new Mac

Step by step

  1. Get an external drive at least twice the size of your Mac's used storage.
  2. Plug it in. If macOS asks Use as backup disk?, click Use. Otherwise go to System Settings › General › Time Machine › Add Backup Disk.
  3. Turn on Encrypt backup and save the password in a safe place.
  4. Let the first backup finish. It can take hours. Leave the Mac plugged in and awake.
  5. After that, keep the drive plugged in often. Time Machine backs up hourly when connected.
  6. Test it: open the Time Machine app (or the clock icon in the menu bar) and restore one file.
  7. Keep a second copy off-site or in iCloud for photos and documents.

Related error codes & messages

Quick answers

When should I stop and get professional help with "Back up a Mac with Time Machine"?

Stop and get help if: Backups fail repeatedly with an error. The backup drive clicks or disconnects. You need to restore an entire Mac and aren't sure which backup to use. Boise Computer Care can diagnose it for a $60 fee; call 208-996-3508.

How long does this fix take and how hard is it?

Plan on 15 min setup + first backup. Difficulty: Easy.

Is it safe to try this myself?

Mostly, if you follow these precautions: Time Machine will offer to erase the drive you choose. Use an empty drive or one you don't need.

Which error messages or codes does this guide cover?

Time Machine couldn't complete the backup, The backup disk is not available.

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