clone
DFS: A backup or read-only copy of a fileset created by copying only the read/write (source) fileset's header rather than the data it contains. The clone preserves pointers to fileset data that existed when the clone was made; it therefore must exist on the same aggregate as the source. Cloning a fileset also refers to making a copy of it with the proper fts commands for later use with the DFS Backup System. See also replica.