Dropbox is a free service that lets you bring your photos, docs, and videos anywhere and share them easily to your family, friends or just anybody whom you like to share your files with. All you have to do is upload files to Dropbox and you would be able to access it wherever you are. It is so termed as a backup service because that is what Dropbox is all about. When you accidentally lose your hard disk or flash drive, you need not worry. Just login to your Dropbox web folder and get hold of your files again.