I actually use same username and passwords on some of the first sites that i signed up. Then one time it come to my senses that, what if i get hacked. All my accounts would be affected, an it wasnt good. Then i tried to change everything, starting on my email. And now i can say i can make a book out of my passwords and username. lol. Its better to be safe than sorry. But im making sure that i backed up all of that incase things would mess up.