Save Volume ...

    Choose "Save Volume ..." when you want to perform backup operations
    on an entire disk and not a subset of the disk.  The disk from which
    you are saving files must be locally accessible.  There are three
    volume operations from which you can choose.  A list box displays the
    following choices:

      Save a volume as a snapshot image - This creates a copy of the
      disk you specify but subsequent incremental backups cannot be
      done on a snapshot backup.

      Save a volume as a baseline for incremental backups - This
      creates a copy of the disk files and records the file data so
      that incremental backup operations can be performed.

      Save an incremental backup of a volume - This creates a copy of
      files from a volume that were created or modified since the
      previous incremental or the previous baseline backup operation.