How to start deja-dup with root privileges instead of the nonroot backup contains?

I want to add a start application for the application deja-dup to ask for root password when it runs, I know that I can do Code:gksu deja-dup-preferences and then Code:gksu "deja-dup --backup" But that only opens up the application in root mode, it doesn't allow me to set it to run as root in the background, what I am asking is how can I add a tray icon that is called Backup and when opened it takes me to deja-dup in root mode and alsi how can I run a cronjob daily for deja-dup ? Would this under root work ? Code: root@tuxthegreat:~# crontab -e and then add Code:4 */12 * * * deja-dup --backup >/dev/null 2>&1