My iCloud email and password My iCloud account is under a @yahoo.com address which was canceled by yahoo for some reason, and the security questions do not seem like ones I would have chosen. So I cannot get my back up from iCloud as I have just purchased a new iPhone. Is it possible to get my old password so I may change my iCloud email and password?
Most probably your system has "saved" your  iCloud log in information in you keyhain.

Open it and type iCloud in the search.