Allowing a user to save basket for later purchase is an extremely useful feature for both user and store owner.
Save basket : A must have feature for high value e-commerce sites.
Let’s take an example of a jewelry or Diamond e-store. When a user finalizes on a diamond ring by selecting the design and metal she will seldom go for immediate purchase. Rather she would prefer to save her selection for later. May be she wants to take her time to make the final decision or consider taking opinion from friends.