LexSynch is a basic directory-synchronization application. Given two directories, it copies files from one to the other. Unlike the Finder, if the destination directory already has a file with the same name and the same (or a newer) creation date, then the file is not copied -- this saves lots of time when backing up files. LexSynch will copy all sub-directories and their files too. You may choose which directory is the source and which is the destination, or have LexSynch copy both ways.
Mac OS X 10.2 or later