And rest assured; everything you had in your iTunes library is still accessible in each app. ICloud seamlessly syncs everything across your devices — or you can back up, restore, and sync by connecting the device directly to your Mac.

May 08, 2017 As long as iTunes isn't running you ought to be able to restore your iTunes library from backup into /Music/iTunes or another folder of your choice. You shouldn't be trying to restore the application.See Locate and organize your iTunes media files - Apple Support for details of where the library ought to be located within the backup.
It is always wise to backup music in your iTunes Library in case of losing your music due to computer crash or virus attack. And it is also useful if you plan to ditch for a new computer or create a new iTunes Library. IMusic is able to backup music, playlists and videos in your iTunes Library to Windows PC, Mac or even an external drive.

Though we store more and more of our music online these days, a hard-copy backup is still the gold standard for keeping your data safe. And if you use Apple Music or iCloud Music Library, the best way to do that is still iTunes.

There are a few ways to back up your iTunes library; it's important to choose one and regularly back up so that you won't have to worry about your local copy getting lost or damaged. My music — at least for me — is one of those must-backup items; I don't want to have to manually re-build or re-buy thousands of tracks.

First: Make sure your entire library has been locally downloaded

If you use iCloud Music Library or the iTunes Store, you may have some or all of your music stored in the cloud. But to truly make sure your purchased and owned content is backed up, you'll want to download a local copy to your Mac. Here's the best way to do so:

To download specific items in your iCloud Music Library right now to your Mac's drive, do the following:

Launch Music (or iTunes on Mojave and earlier) on your Mac.
Source: iMore
Find the Artist, Albums, or Songs that you want to download.
Click the ... button to bring up a pop-up menu.
Source: iMore
Click Download to initiate the download of these items.
Source: iMore

And if you want to start automatically downloading everything that you add to your Apple Music library from this point forward, then it's easy peasy! Here's how:

Launch Music (or iTunes on macOS Mojave and earlier) on your Mac.
Source: iMore
Click Music in the menu bar.
Click Preferences (or press ⌘, on the keyboard).
Source: iMore
Make sure you're in the General tab.
Source: iMore
Click the box for Automatic Downloads to turn it on.
Source: iMore

Once that is turned on, any music you add to your Apple Music library will be downloaded automatically to your Mac's hard drive.

How to back up iTunes via Time Machine or another backup service

If you have Apple's Time Machine backup system enabled — or any other cloud — or system-based backup — your iTunes library should automatically be covered. This way, if you ever need to restore, you can just pop back in Time Machine's History (or a past backup from CrashPlan or Carbon Copy Cloner, for example) to retrieve it.

How to manually back up your iTunes library

If you're not employing a Mac-wide backup service (really, you should get on that), or if you just want to manually back up your iTunes library separately, here's how to go about that.

Consolidate your library

To ensure that all of your iTunes files are in the same place when you make a manual backup, you should first consolidate your iTunes library.

Make sure you've downloaded a local copy of your music to your Mac.
Launch Music (or iTunes in macOS Mojave or earlier) on your Mac.
Source: iMore
Click File in the upper left corner of your Mac's screen.
Hover your cursor over Library in the drop down menu.
Source: iMore
Select Organize Library from the secondary menu.
Source: iMore
Tick the box for Consolidate Files when the Organize Library window appears.
Source: iMore
Click OK.
Source: iMore

This will make a copy of all files in the iTunes media folder, leaving the originals in their current location.

Copy your iTunes library to a backup source

If you are using an external hard drive, connect it to your Mac using a USB cable.
Click on Finder to open a Finder window.
Select your Mac's Hard drive.
Source: iMore
Click on Music in the sidebar.
Source: iMore
Select the Music folder (or iTunes on macOS Mojave and earlier) and drag that folder to the external hard drive icon on your desktop or copy it to your online backup service.
Source: iMore
Click Authenticate, if prompted, to give permission to make a copy of the iTunes folder.
Enter your administrator password.
Click OK.
Source: iMore

The copy process will begin. This could take a very long time, depending on how big your Music/iTunes library is. So, sit back, relax, watch a movie, or whatever you do to pass the time.

Desperate times call for desperate measures

If you are about to do something wild with your Music or iTunes library and don't have a way to back it up on an external drive or online backup service, you can make a temporary backup that you store right on your Mac. This is, by no means, a solid backup plan, but can be useful in a pinch.

Note: After making a copy, it is a good idea to move the copied folder to an easy-to-find location that is separate from any folder you plan to make changes to (like the Music folder). This copied folder should be deleted immediately after it is no longer needed because it takes up extra space on your computer's hard drive unnecessarily and could cause confusion with your most current Music or iTunes folder.

Click on Finder to open a Finder window.
Select your Mac's Hard drive.
Source: iMore
Click on Music in the sidebar.
Source: iMore
Right-click or control-click on the Music folder (or iTunes folder if you're still on macOS Mojave or earlier).
Source: iMore
Select Duplicate from the drop down menu.
- The copy process will begin. This could take a very long time.
  Source: iMore
Move the copied iTunes or Music folder to a new, easy-to-find location.
Delete the copied iTunes or Music folder once you no longer need the temporary backup.

Any questions?

Running into issues making an iTunes backup? Pop them in the comments below.

March 2020: These are still the current steps for how to back up your music.

Serenity Caldwell contributed to an earlier version of this guide.

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Backup Itunes Library On Mac