On Mac OS X and using CC 2014, I save multiple Indesign books into folders on a shared drive. Within 20 minutes to 7 days later, random books are disappearing. Sometimes the same book disappears, sometimes different books, and all at random. Other users saving to the shared drive are also seeing this issue. We are always saving the books before closing them, and use these books on a regular basis. This has happened since we all installed CC 2014.