A storage server is a type of server that is used to store, access, secure and manage digital data, files and services. It is a purpose built server used for storing and accessing small to large amount of data over a shared network or through the Internet.
A storage server may also be called a file server.
Online data storage refers to the practice of storing electronic data with a third party service accessed via the Internet. It's an alternative to traditional local storage (such as disk or tape drives) and portable storage (such as optical media or flash drives). It can also be called "hosted storage," "Internet storage" or "cloud storage."