About Bento Backup Files
When you create a Bento backup file, you create a copy of the data that is in Bento. The backup file contains the data in your libraries and collections at the time you run the back up command.
Important  The Bento backup file does not contain the data from the Address Book iCal, and iPhoto applications. You should back up your Address Book, iCal, and iPhoto data whenever you back up your Bento data.
Backing Up Address Book, iCal, and iPhoto Data
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However, if you add fields to the records in the Address Book library, the iCal Events library, the iCal Tasks library, or the iPhoto library, then the data in those additional fields is included in the Bento backup file.
How Field Types Are Backed Up
Consider the following when you back up file list fields, media fields, or related data fields.
 
Bento backs up
The contents of the fields (for most media fields) because Bento stores copies of the media files.
However, if you use aliases to media files rather than copying the media files into bento.bentodb, Bento backs up the filenames and locations of the files that are added to media fields, but not the contents of the files. You should back up these media files to a location in the Finder.
However, Bento does not back up the data from the Address Book, iCal Events, iCal Tasks, and iPhoto libraries. If you use related data fields that reference those libraries, then the data is dependent on what is available in the Address Book, iCal, and iPhoto applications.