I am looking for a place (and learn how to) to backup my computer. I'm wondering what people think of Dropbox. I'm afraid I might have my social security number on my computer somewhere (not sure...I tried to never type it into the computer but you know how it goes). If I backed up my computer, would my personal information go in too or just window's files?

And how would I go about backing up my computer? I should know by now but I don't because I never have before.