OS X Yosemite (/ j oʊ ˈ s ɛ m ɪ t iː / yoh-SEM-it-ee) (version 10.10) is the eleventh major release of OS X (now named macOS), Apple Inc.' S desktop and server operating system for Macintosh computers.
The invisible Library subfolder of your Home folder is the repository of everything that OS X needs to customize your Mac to your tastes. If you want to add something to a Library folder, it’s usually best to add it to your Home/Library folder.
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You won’t spend much time (if any) adding things to the Library folder or moving them around within it, and that’s probably why it’s now hidden from sight. Still, it’s a good idea for you to know what’s in your Home/Library.
The public Library folder is used to specify preferences for all users on this Mac. This Library folder, however, is all about you and your stuff.
Be cautious with all Library folders. OS X is very persnickety about how the folders and files within it are organized. You can add items to and remove items safely from most public or Home Library folders, but leave the folders themselves alone. If you remove or rename the wrong folder, you could render OS X inoperable.
It’s like the old joke about the guy who said to the doctor, “It hurts when I do that,” and the doctor replies, “Then don’t do that.”
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To find your hidden Home/Library folder, do this:
Hold down the Option key on your keyboard.
Click the Go menu.
The (formerly) invisible Library folder appears in the Go menu as long as the Option key is pressed.
Select Library and release the mouse button.
You should see several folders in the Home/Library folder; the exact number depends on the software that you install on your Mac. You probably have folders called Mail, Safari, Logs, and Preferences, for example.
If you don’t want to have to do this dance every time you want to open your Home/Library, select your Home folder in the Finder and choose View→Show View Options (or press Command+J). Enable the Show Library Folder check box and your Home Library will be visible evermore (or at least until you deselect the check box).
Some of the most important standard folders in the Library folder include the following:
Application Support: Some applications store their support files here; others store theirs in the main (root-level) public Library folder.
Fonts: This folder is empty until you install your own fonts here. The easiest way to install a font is to double-click its icon and let the Font Book utility handle it for you. Here’s how to install a font manually:
To install a font that only you can use: Drag the font file’s icon to the Fonts folder in your Home/Library. The font is available only to this user account (because other users can’t use fonts stored in yourHome/Library folder).
To install a font for all users of this Mac: Drag the font file’s icon into the Fonts folder in the public Library folder — the one at root level that you see when you open your hard drive’s icon.
Preferences: The files here hold the information about whichever things you customize in OS X or in the applications you run. Whenever you change a system or application preference, that info is saved to a file in the Preferences folder.
Don’t mess with the Preferences folder! You should never need to open or use this folder unless something bad happens — say, you suspect that a particular preferences file has become corrupted (that is, damaged). Just forget that you know about this folder and let it do its job.
If you don’t know why you’re doing something to a folder (other than the Fonts folder) in your Home/Library, don’t do it. There must be some good reasons why Apple decided to hide the Home/Library folder in OS X Yosemite, and one of them is to keep you from accidentally screwing something up.
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Photos User Guide
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.
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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.