The backup and restore procedure of Movies, Musica and Book Keeper uses iTunes File Sharing (http://support.apple.com/kb/ht4094)

Backup

1. In Movies (Book Keeper or Musica), go to [Settings], [Data] and tap [Backup].
2. Once the backup is available, connect your iPhone/iPod to your computer, and start iTunes
3. In iTunes, tap on the iPhone/iPod icon (under Devices), go to [Apps] and scroll down to [File Sharing]
4. Tap on Movies (Book Keeper or Musica), and on the right hand side you see a file named backup.zip.
5. Save this file to your computer, and keep it save.

Restore

1. Connect your iPhone/iPod to your computer, and start iTunes
2. In iTunes, tap on the iPhone/iPod icon (under Devices), go to [Apps] and scroll down to [File Sharing]
3. Tap on Movies (Book Keeper or Musica), select the [Add] button and upload the backup.zip you saved during the restore procedure.
4. iTunes will now sync the file to Movies (Book Keeper or Musica).
5. Once this process is done, start the Movies (Book Keeper or Musica) app, go to [Settings], [Data] and tap [Restore].
6. You might want to clear your library prior to restoring, in order to make sure no duplicate movies (books or albums) are created