Mirror copies a directory to another location. If the destination directory already exists, Mirror only copies the files having been added, modified, or deleted comparatively to the source directory.
Mirror is especially adapted to frequent backups. Compared to a classical directory copy, time is saved because only added or modified files are transferred. Moreover, when Mirror detects that a file is no more present in the source directory, it deletes it in the destination directory too. This saves disk space if you rename or move files.
Mirror is a command line tool, without graphical interface. It can be easily used in scripts and BATCH files.
Help file (the options list is at the end)