You can freeze your Blast! Depending on the ingredients in your NutriBlast, it should keep in the freezer for a couple weeks if sealed in an airtight container, however the texture may change.
Most Blasts will lend more of a sorbet texture, however when you use frozen banana, you can make "banana ice cream" that will store quite well :)
Here is a general recipe for how to make banana ice cream. I'd cut this recipe by a third to fit in the NutriBullet!