Thank you for your answer.
Do you know if it will delete all my galleries and photos?
Massimo
I have got the same problem. Please help.
Thank you.
I’ve got the same problem. It was the theme (I have “Pure”).
Just disable it and active other, like Twenty Fifteen: button is back.
Now you can backup, restore and reactivate the original theme.
Or you can schedule a backup. It works.
Bye
Massimo