Learn more about Apple ID. If you use a different Apple ID for iTunes and iCloud, and want to restore from a backup, first enter your Apple ID for iCloud. After your device restarts, you'll be asked to enter the Apple ID that you use with the iTunes Store, App Store, or iBooks Store.
File system repository. The file system repository allows access to files which have been uploaded (e.g. via FTP) into designated folders on the server. A file system repository may be available site wide for everyone or within an individual course (set up by admin) or for an individual administrator.
Files with the .fdb extension are most commonly associated with portfolio catalog files. These files contain a database of images used by the image organization and cataloging applications, such as the Extensis Portfolio software. The FDB files contain metadata and thumbnail images for each file stored in the portfolio catalogs.