Thank you for answer. I'd like to profile to step of rsync process. This is my crontab. 0 0 * * * /usr/bin/rsync -avx --delete --exclude=/.snapshot/ /mnt/fileserver/ /mirror/fileserver/ #/mnt/fileserver is nfs now. but I'll export outside LAN. I'm looking for more effective plan. "Small(Mirror Disk Space) Quick and Redundant" Yujis