to download and delete all the recording files you can use Winscp software.
"
http://winscp.net/eng/download.php"
1. install winscp ,
2. login to the server using the ssh root password.
3. go to the /var/spool/asterisk/monitorDONE/MP3 ---> if your recordings are in mp3 format
4. COPY all and drag to any folder on the left side of winscp window.
5. once done select all recording in the MP3 directory and press delete button or right click and delete.
Note: the orginal recordigs in wav will be stored in ORIG directory , it also to be deleted.