The database is saved within the application's preferences file com.Nesfield.DiabetesLogbookX.plist which is stored in the user's Preferences folder of their Library. It is strongly recommended that this file is regularly backed up: preferably to a volume that is not the same as the one on which your account data is stored; suitable backup volumes would be iDisk, a networked folder, another computer, or to CD or DVD.

To restore the backed up file, without the application running, simple copy the file back into the Preferences folder then restart the application.