I cannot stress the importance of backing up your personal files (such as your documents, pictures, and videos). A surefire way to get this done is by purchasing an external hard drive; and, to really make it easy I suggest one of the portable external hard drives that you simply plug in the USB port and start using it. The beauty of the portable external hard drive is that you can easily move it from one PC to another; PLUS, you can then store the drive off site (in the event disaster at home would occur). Many of the portable external hard drives are small enough to easily fit in a briefcase and even your pocket.
A good choice to take a look at is the Western Digital My Passport series of drives (e.g. My Passport Essential SE 1 TB USB 3.0/2.0). The key feature with this drive is that it features dual USB 3.0 and USB 2.0 compatibility. If you are not backing up your files, here is a good way to start. Believe me, I have seen people turn ghost white, cry, yell, and stomp when told there files are gone.