Last week Apple updated Backup to version 1.2.3.
The updated was posted on the 9th July and I've only just downloaded it.
What am I playing at?!
New features include: New QuickPicks let you back up Safari settings and iTunes purchased music. A customizable QuickPicks list lets you remove or add QuickPicks to your list. Backing up to disc is disabled if you have an unsupported external CD or DVD drive. (Wouldn't it have been better to add support for more drives?)