It’s not something that you (like to) think about too often, but bad things happen occasionally. Your computer gets infected with a virus, or otherwise damaged, for example. Or maybe someone just accidentally deletes or saves over a file that you didn’t really want anyone playing around with.
If you have copies of your files on Dropbox, you can get them back even if something happens to your computer. Dropbox also keeps a record of recent versions of a file, so if it gets deleted or changed, you might still be able to recover it!
Well, that’s a quick primer on what you can do with Dropbox!