MBP with SSD and HD in optical bay. HD has plenty of space but isn't empty. (Note: Full external backup created of both drives already.) I'd like to make a carbon copy clone of my internal SSD with Lion OS to the internal optibay HD and then do a clean install of ML on the SSD. Is this a good idea, or does making a CCC to the HD wipe what was originally on the HD? Will the HD be bootable with Lion on it using the option-key-start method if things go wrong with the SSD? Thanks for any ideas/help.