Backup Additional files and folders not working

Hi all expert,

I want run a schedule backup for the monitor files through the ftp server. As there is no options to backup the monitor files, so what I did is put /var/spool/asterisk/monitor/ in the Additional files and folders entry.

However, it seems not working as it cannot backup anything in the tar.gz file. it work fine when I select the CDR or VoiceMail option provided by FreePBX.

Anybody has any hints? Thanks.