Logrotate don't route

[Marco <marco4ever@libero.it>]

Hi all,

I have make in /etc/logrotate.d a new file (as name backup) for rotate 
my backup's log.
This is the text in my file:
/var/log/backup {
   rotate 4
   monthly
   compress
   delaycompress
   missingok
   notifempty
   create 640 root adm
}
I have also restart my system, but my log don't route.

Could you help me???

Thanks
Marco