backup: sync rsnapshot.conf with backup server

Sync `rsnapshot.conf` with what is currently running on the backup
server:
`ssh backup cat /opt/local/etc/rsnapshot.conf > rsnapshot.conf`

backup/rsnapshot.conf

@@ -8,7 +8,7 @@ cmd_logger	/usr/bin/logger
 
 retain	daily	7
 retain	weekly	4
-retain	monthly	12
+retain	monthly	6
 
 verbose		2
 loglevel	3
@@ -21,6 +21,5 @@ ssh_args	-p 22 -i /root/.ssh/nodejs_build_backup
 cmd_preexec	/root/backup_scripts/dist.sh
 backup	root@ci.nodejs.org:/var/lib/jenkins/	ci.nodejs.org/	+rsync_long_args=--exclude "workspace*"
 backup	root@ci-release.nodejs.org:/var/lib/jenkins/	ci-release.nodejs.org/	+rsync_long_args=--exclude "workspace*"
-backup	root@nodejs-www:/var/log/nginx/	www-logs/	+rsync_long_args=--exclude "*.log" --exclude "old/*"
-backup_script	/root/backup_scripts/benchmark_mysql.sh	benchmark/
+backup	root@direct.nodejs.org:/var/log/nginx/	www-logs/	+rsync_long_args=--exclude "*.log" --exclude "old/*"
 backup_script	/root/backup_scripts/iptables.sh	iptables/