It worked OK for me Simon, but then I noticed this week on attempting a restore, it did not. It did not work with the latest version of Mozilla, so I downloaded the lates version of Mozbackup, and its fine.
Like you say Simon, you can do it manually, by just copying the Mozzila folder in "Application Data" But as that is a hidden file some peeps may prefer to just hit a Mozbackup icon on their desktop.