I found some problem with empty folders using the Backup action, FTP -> Local and Local -> FTP.
1. FTP -> Local:
If I create an empty folder on the FTP side, it won't back it up on the Local side.
2. Local -> FTP:
First I backup a folder that has many directories and files to the FTP. This works without problem.
One day I delete one directory with some sub-directories and files in the folder.
Next time I backup, all the files of the deleted directory deletes but all the folders remains. It remains as a bunch of empty folders.
*I got the Handle Empty Folder checked on Options.
It's something else I have to configure