Dropbox is trying to make it easier for you to work at home or wherever you might be. One new feature, which is available for all Dropbox users, automatically backs up your PC or Mac files in dedicated system folders. The tool allows you to access your files on-the-go or at least give you a backup if your hardware goes on the fritz.
Before Dropbox launched this long-overdue function, you needed to allocate files to dedicated folders. Now, it'll back up entire folders and even sync connected devices (like external hard drives) as long as these are connected to your computer when you set up the backup process.
Source: Engadget