I would recommend Backer if you want to synchronize your files with your backup.
http://www.cordes-dev.de/english/overview.html
It is very easy to use and very reliable. This is an ideal software if you're doing daily backups to an external hard disk or removable disc because you do not need to copy all files, only those that differ. The preview lets you select the files that you want to copy. If you don't want to preview the files each time you do a backup, you can de-select this option.
However, Backer allows you to back up only one volume at a time.