Minecraft not backing up

Yet again I am having the same darn issue i had before only worse. Minecraft didnt back itself up for 16 hours. We stopped playing yesterday 6/12 2:25pm and then started playing again form 730pm until 1030pm and not once did Minecraft back itself up. I' have had this issue multiple times now and accross 3 different versions of minecraft. It would be incredible if this can please be fixed.