Why on earth would you use an SSD for backup instead of the HDD? Edit: I assumed here that the both were internal, which they most likely aren't on second thought.
You can backup anything you want on the SSD. Just drag things onto it, or use Time Machine, if you are unsure on how to do it yourself.
Sorry I wasn't clear when I said backup I am talking about a backing up my iphone and ipad through Itunes. Currently I see everything that backups from my idevices still going to the hdd. Can I get it to backup those devices(through Itunes) to the internal SSD and still have my itunes media files/pictures on the internal hdd?