What is the difference between save and export in Docker?

Question

I am playing around with Docker for a couple of days and I already made some images (which was really fun!). Now I want to persist my work and came to the save and

Answer 1

The exported image will not have any layer or history information saved, so it will be smaller and you will not be able to rollback.

The saved image will have layer and history information, so larger.

If giving this to a customer, the Q is do you want to keep those layers or not?