e mail application in this example a presentation window 1602 is showing an address book application address book information within the application can be revised over time and the time machine application can be used to restore for example lost or deleted contact information within an address book in some implementations the user can restore a directory of contacts by selecting a snapshot that includes at least one directory not present in a current snapshot the user can also restore a complete address book by selecting a particular snapshot containing the address book and next selecting a restore button 1604 as shown in fig1 the time machine interface in this implementation does not include a timeline for the user to select snapshots from in some implementations the user can navigate through snapshots using the control buttons 406 a and 406 b as another example the timeline can appear as a rollover effect when a cursor or the pointing device is placed on the corresponding area of the interface in some implementations the user can select an item timeline icon 1606 to open a timeline view of snapshots which can present text information about one or more snapshots and optionally facilitate navigation to any snapshot in some implementations the timeline view can be toggled off and on using the item timeline icon 1606 the time machine interface can also be used to present backup information relating to an.