It provides less durability with the same level of availability.

For example, this is about data you could potentially regenerate like a tax calculation or a payslip. This is cheaper. Suppose you create thumbnails for all your pictures. If you lose a thumbnail you could always regenerate it.

When deciding which storage to use think about the various storage options, their advantages vs disadvantages. Are you optimizing for durability, the frequency of retrieval, or availability?