Apple has released Backup 3.1 through its Software Update utility. The update is described accordingly by Apple:
"Backup 3.1 delivers added support for some backup destinations and addresses file restoration and other issues. Backup 3.1 is recommended for all users of Backup 3.0. Significant areas addressed are: improved support for iDisk, local hard drives, and some network destinations (Mac OS X Tiger only); new iWeb QuickPick and updated iLife plan; and addresses issues with restoring files."