SyncDir

Syncronizes one directory to another based on the specified options.  The TargetDirectory must already exist. If the specified Target is only  a drive (ie. 'c:'), then the entire path on the Target drive is assumed  to be the same as on the Source drive. No files are added to the Target  unless the -a switch is used. No files are deleted from the Target unless  the -d switch is used. No files are replaced in the Target unless the -r  switch is used. By default, -r only copies files if the file in the Source  is newer than the file in the Target. Files are copied if they are different,  even if the file in the Target is newer if -c is used.  This program only  compares file sizes and dates, and does not compare file contents.  Supports files greater than 2GB.