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Back up the library in Photos on Mac. Even if you use iCloud Photos, it’s important that you always back up your library locally using one of the following methods. Use Time Machine: After you set up Time Machine, it automatically backs up the files on your Mac. How to view a Mac's /Library folder. There are three ways to easily view your hidden /Library/ folder. In macOS Sierra Apple added a Finder keyboard shortcut that makes it possible to quickly. Nov 29, 2017 macOS 10.13 High Sierra problems: how to fix them. If you still have a problem downloading macOS High Sierra, open up the App Store, click ‘View My Account’ and see if there is anything in.

Follow these steps to use the Photos library repair tool:

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  1. Hold down the Option and Command keys while you open Photos on your Mac.
  2. In the dialog that appears, click Repair to start the repair process.

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You might be asked to type in your user account password to authorize the library repair.

The repair tool analyzes the the library's database and repairs any inconsistencies it detects. Depending on the size of your library, this might take some time. When the process is completed, Photos opens the library.

If you repair a library that's automatically updated with iCloud Photos, the entire contents of the library re-updates with iCloud after the repair process completes.

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Photos User Guide

Sierra Library Program

Even if you use iCloud Photos, it’s important that you always back up your library locally using one of the following methods:

  • Use Time Machine: After you set up Time Machine, it automatically backs up the files on your Mac. If you ever lose the files in your Photos library, you can restore them from the Time Machine backup. For more information about setting up Time Machine, see Back up your files with Time Machine.

    WARNING: If a Photos library is located on an external drive, don’t use Time Machine to store a backup on that external drive. The permissions for your Photos library may conflict with those for the Time Machine backup.

  • Manually copy your library to an external storage device: Drag the Photos library (by default in the Pictures folder on your Mac) to your storage device to create a copy.

If you have more than one photo library, be sure to back them all up.

Important: If any of your image files are stored outside your photo library, those files (known as referenced files) aren’t backed up when you back up your library. Be sure to back up those files separately. To make it easier to back up all your image files at once, you can consolidate referenced files into your library. See Change where Photos stores your files.

See alsoCreate additional photo libraries in Photos on MacRepair your library in Photos on Mac