Some ibooks have disappeared From my ibooks library. One category is completely missing. These books were not purchased from ibooks.
Anything not purchased from Apple (music from iTunes, books from iBooks, et al) is likely to be deleted from your iOS device when (A) synced to a different computer than the last time it was synced or (B) the phone is updated to a newer iOS. Occasionally, some things just may randomly vanish as well. The reason is due to digital rights. When Apple first came out with iTunes, the music industry threw a bit of a fit and made them program things so that a combination of iTunes and an iPod could not be used as a vessel for music piracy. This carried over to books as well. If you didn't buy it from Apple, then Apple does not guarantee the content. They don't have the legal right to keep content not bought from them safe, and if there is a glitch, or an update, or you sync with a library on a different computer, then that content will be lost.
That being said, using iTunes to make a backup on a single dedicated computer might save any kinds of notations or bookmarks you place on things not ought from Apple. This I can't guarantee, but it is likely. If you switch between two computers, that's when things get lost. Also, backing up to iCloud will also not likely keep anything not purchased from Apple.
Mar 01, 2015 |
Apple Ipad I-pad