Command line option /T
The target to source option specifies that files are to be copied from the second, or target, path to the first, or source, path. Files will not be copied from source to target unless the /S option is also used.
Example:
C:>Cmdsync d:\MyData "*.* -*.bak" e:\MyDataBackup /S /T /I /R /Lc:\mylog.txt /X