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Does the phone restarts? boot on safe mode and check again
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008
It's not a Sony issue, its an app that was installed by you, you can uninstall one by one until you find the culprit or you can repair the phone with PCC
Bridge (for Mac)
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355
What does it mean "repair your phone" using sony bridge ?
Ive installed bridge and it allows only transfer, backup, update etc...
Did someone got the problem fixed on his/her's xperia Z ? ? (paloma0111???)
Thanks !