Do you guys have a back protector? If not, how is the back holding up with everyday usage? Any scratches? I tried putting on a back protector to protect the back of my 5C, but failed miserably and had a lot of dust, even in a steamy bathroom, due to its curve. So now, I only have a screen protector with a bumper and wanted to ask if the back is pretty scratch resistant? I'm pretty paranoid about scratches, and was thinking of getting a case that protects the back, but if the back is pretty strong enough to handle scratches from everyday usage, I'll stick to the bumper. Thanks!