I also have iBooks

I also have iBooks

I also have iBooks. 
Even though it is not applicable in Turkey, iBooks will be transferred to all other devices once bought. Apple is the pioneer in this field and is pushing the limits. For example when you buy a book and made notes and marks on it, these modifications will be transferred to your other devices automatically.  

Backup and Restoration
iCloud will backup your important data for you. This data includes:

•      Paid music, applications and books.
•      Photos and Videos in the Camera Roll.
•      Device Settings
•      Program Setting Data
•      Main screen and application layout settings 
•      Text and Multimedia messages
•      Ringtones
For restorations the only thing you would need to do is enter your Apple ID, iCloud will do the rest. When you buy a new device or ‘format’ a corrupt device this will be a vital feature. 
At this point you would need to create your Apple ID because these processes would be impossible without one.