The Free On-line Dictionary of Computing (19 January 2023):

Storage Management Services

    (SMS) Software that enables network administrators
   to route backup data from various devices on a network to
   another device such as a server or a magnetic tape backup
   unit.  This is done either to make use of a high-capacity
   storage system such as a tape juke-box or for disaster
   protection.

   (1996-02-18)