As far as I can tell (unless I'm getting the syntax wrong), you can't specify that specific folders are excluded from a backup, so for example, I'd like to backup everything under "c:\Documents and Settings" but explicitly exclude certain directories (the browser cache directories for Internet Explorer, Firefox, and Chrome) but don't want to specify the full path the the specific directories to be excluded.
However, specifying the full directory path fails to exclude that directory, and the files contained in it are still backed up. For example, I've tried:
/exclusionFilter "C:\Documents and Settings\Eric.TALTOS\Local Settings\Application Data\Google\Chrome\User Data\Default\Cache\"
but it doesn't exclude the directory from the backup.