I have a mid 2012 MBP running 10.10.5 and want to do a clean install of OS X. From my previous two MacBooks I have always migrated from one system to next, keeping all files and settings. I have an SSD as the boot drive and moved my HDD to the SuperDrive bay and use that as iTunes and Photos library and some Virtual Machines I use for work. I use Time Machine to backup both drives. Should I go ahead and wipe the SSD and do a clean install of OS X Yosemite or wait for El Capitan and do the clean install with the new OS X? This will be my first time to do a clean install and re-import my files back to it. I have wiped my previous MBAir that I gave my wife for her to start with a fresh system. Is there anything I should look out for when copying my files back over from my Time Machine backup? When I wipe the SSD to re-install OS X, it won't affect the HDD correct?