When you automate, you eliminate a decision – to save or not to save. Once you decide to set up auto-save and go through the initial process, that’s all. You keep saving at interval without a need to make a decision on either to save or not. With this one savings keep accumulating with time till one have a reasonable amount.
In here we have some banks that do this kind of stuff to us, you just to need to set how much money you have to save every month for few months based on your contract with the bank before and then it's all set to go, if you manage to save it until the end of your contract then you would get the interest. Otherwise, you will charged. It's kinda nice to use that so it forces you to save, which is good and difficult for some people.
It works for some people especially me.