I can choose to backup my iOS device to either iCloud or to the local hard drive. Are there any disadvantages to backing up to iCloud? Is there something that wouldn't be backed up to iCloud in comparison to a local backup? Or in other terms: if I lost my device today, would a new one restored from iCloud be identical to one restored from a local backup? And if I choose to backup to iCloud, can I still sync with the local iTunes library to add new PDF books, ripped music etc.?