To me in the past,  it would be a matter of course as time goes on and Hard drives need replacing every couple of years. Now I'm wondering how long we go with our sporty little SSD  drives before a new C drive becomes needed? 
I'm 2 years now and was not planning on replacing it for a couple more. It's a 240G and is still only at 30% as I have been cleaning out the CCC download folder as recommended here. I have at least 12 music software programs set up on it but no data.