itunes doesn't back up my apps iphone 6 plus
I have an iphone 6 plus with ios 9.2.1 and itunes version 12.1.2.27
when i run a back up of my iphone to itumes i get a pop up asking me if i want to also back up my apps. i usually say yes. But when the back up process is done i don't see my apps in the apps library. does it mean the back up failed?
I can see that the back up was done in the "preferences" section under "devices" but i don't see my apps.
any help would be appreciated.
Thanks