delete the backup directory

Good afternoon, how do I not allow it to be backed up from one or more directories? I tried to use the code below with some ways but continues doing backup folder.

define( 'HMBKP_EXCLUDES', '/home/provedor/public_html/folder.com.br/' );

define( 'HMBKP_EXCLUDES', 'folder.com.br/' );

http://wordpress.org/extend/plugins/wp-super-cache/