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Jan 09, 2020  I tried to move my Photos library from a external HDD to a new external SDD. My library size is about 1.5TB. New SSD is a 2TB drive. For the 'old' library (HDD) iCloud is activated. I followed the steps in this article: Move your Photos library to save space on your Mac.

• How To Backup Photo Library On Mac To External Hard Drive
• How To Backup Photos Library On Mac To External Drive Iphone
• How To Backup Photos Library On Mac To External Drive Windows 7

Your Photos library holds all your photos, albums, slideshows, and print projects. If your library is large, and you want to free up storage space on your Mac, turn on iCloud Photo Library and use Optimize Mac Storage, or move your library to an external drive.

Before you start, be sure to back up your library.

Prepare your drive

1. Mar 10, 2019 Before you open your copied Photos library on the external drive, you have to disassociate the library on your Mac from iCloud. (If you don't use iCloud Photo Library, you can skip these steps.) Open Photos on your Mac. Go to the Photos menu. Select Preferences. Click on the iCloud tab. Uncheck iCloud Photo Library.
2. Aug 23, 2015  (mac mini late 2014, 2.6 GHz i5, 8GB mem, Yosemite 10.10.5, Photos 1.01, new EHD - WD My Passport for Mac) Issue - trying to back up photos from iPhone 5S to an external hard drive - phone is full, I don't trust iCloud to keep photos deleted from phone, I don't want to use Time Machine as sole backup - want photos on external hard drive.

You can store your library on an external storage device, such as a USB or Thunderbolt drive formatted as APFS or Mac OS Extended (Journaled).¹ Find out how to check the format of your external storage device.

Mac ox 10.15. 2019-11-23  I am trying to find the standard C library on Mac OS X. I've tried paths like: '/usr/lib/libc.a' or '/usr/lib/libm.a', but there are no such files on the system. Could you tell me where to find it? 2020-4-6  The User Library folder is hidden by default in MacOS Catalina, MacOS Mojave, macOS High Sierra, and macOS Sierra, but some advanced users may wish to show and access the /Library/ folder, which contains preference files, caches, and application support data. If you're using OS X Mavericks or later, you have the easiest way of all to permanently access the hidden Library folder. This is the method we use, and we recommend it for anyone who wants permanent access and isn't worried about accidentally modifying or deleting a file from the Library folder.

To prevent data loss, Apple doesn't recommend storing photo libraries on external storage devices like SD cards and USB flash drives, or drives that are shared on a network.

Move your Photos library to an external storage device

1. Quit Photos.
2. In the Finder, go to the external drive where you want to store your library.
3. In another Finder window, find your library. The default location is Users > [username] > Pictures, and it's named Photos Library.
4. Drag your library to its new location on the external drive. If you see an error, select your external drive's icon in the Finder, then choose File > Get Info. If the information under Sharing & Permissions isn't visible, click , then make sure the 'Ignore ownership on this volume' checkbox is selected. If it's not selected, click to unlock it, enter an administrator name and password, then select the checkbox.²
   
   
5. After the move is finished, double-click Photos Library in its new location to open it.
6. If you use iCloud Photo Library, designate this library as the System Photo Library.

Delete original library to save space

After you open your library from its new location and make sure that it works as expected, you can delete the library from its original location.

In a Finder window, go back to your Pictures folder (or whichever folder you copied your library from) and move Photos Library to the trash. Then choose Finder > Empty Trash to delete the library and reclaim disk space.

How To Backup Photo Library On Mac To External Hard Drive

Open another Photos library

If you have multiple libraries, here's how to open a different one:

1. Quit Photos.
2. Press and hold the Option key while you open Photos.
3. Select the library that you want to open, then click Choose Library.

Photos uses this library until you open a different one.

Learn more

How To Backup Photos Library On Mac To External Drive Iphone

If you have a permissions issue with your library, you might be able to resolve the issue by using the Photos library repair tool.

1. You can't move your library to a disk that's used for Time Machine backups.

How To Backup Photos Library On Mac To External Drive Windows 7

2. If the volume isn't formatted APFS or Mac OS Extended (Journaled), or has been used for Time Machine backups but hasn't been erased, this checkbox will either not be present, or won't be selectable after unlocking. Erase and reformat the drive for this option to be available.