Massimo

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