I'm pretty new to computers etc and a few weeks ago bought a small USB memory stick to save my information should my computer crash. The first time I used it was fine as the 'stick' was empty, but now I want to update it I'm scared of over writing the 'new' info on my PC with the 'old' info from my 'stick' if you see what I mean. How do I know which way the info is going? Hope you can understand the ramblings of a silver surfer. Thank you.