The easiest way to add past iTunes Store purchases to your iOS device is to re-download them from iTunes in the Cloud.
You can also transfer your purchases from your device to your computer.
Transfer your purchases to your computer
If you bought the iTunes Store content on your device using multiple Apple ID accounts, you'll need to authorize the computer for each one.
To transfer purchases from your device to a computer:
- Connect your device to the computer. Wait for its icon to appear in iTunes.
- Go to File > Devices. If you're using iTunes for Windows and can't see the menu bar, learn how to turn on iTunes menus in Windows.
- Choose Transfer Purchases from [device name].
This feature works only for content bought from the iTunes Store. Any items that you imported from audio CDs or received from other sources won't copy from your device to the iTunes library. However, all podcasts from your device's Podcasts app and copies of all PDFs and books from your device's iBooks app will transfer to the computer. Learn how to transfer media to your iTunes library.
Learn how to move your music to a new computer.
A note about copyright
iTunes software may be used to reproduce materials. It's licensed to you only for reproduction of non-copyrighted materials, materials in which you own the copyright, or materials you're authorized or legally permitted to reproduce. If you're uncertain about your right to copy any material, you should contact your legal advisor. See the iTunes Store Terms of Service for additional information.