is it ok to delete old iphone backups
i have the latest backup for my phone and my wife's phone in itunes, prefs, devices. i also see one each from when we got our new phones on jan 5. is it okay to delete the jan 5 backup files now that i have a newer backup? is there a good reason to keep them? also, in finder, itunes, i have previous itunes libraries from 2009 to 2011, do i need these? what will happen if i delete them? thanks.
MacBook Pro, Mac OS X (10.6.8), iPhone 5 iOS 6.0.2