diff --git a/install_orbit_environment.sh b/install_orbit_environment.sh
index 6365c84..fd9483e 100644
--- a/install_orbit_environment.sh
+++ b/install_orbit_environment.sh
@@ -127,6 +127,11 @@ sudo sed -i 's/^\(backup\t.*\)/#\1/g' /etc/rsnapshot.conf
 matched_backup_home=$(grep -P "backup\t$HOME" /etc/rsnapshot.conf|xargs)
 if [ -z $matched_backup_home ]; then
 	sudo sed -i "$(echo "s/^\(#backup\t\/home\/\t\)/backup\t$(echo $HOME|sed 's/\//\\\//g')\tlocalhost\/\n\1/g")" /etc/rsnapshot.conf
+else
+	matched_backup_home=$(grep -P "(^|\s+)backup\t$HOME" /etc/rsnapshot.conf|xargs)
+	if [ -z $matched_backup_home ]; then
+		sudo sed -i "$(echo "s/[#\s\t]*backup\t$(echo $HOME|sed 's/\//\\\//g')/backup\t$(echo $HOME|sed 's/\//\\\//g')/g")" /etc/rsnapshot.conf
+	fi
 fi
 sudo wget -nc http://gitlab.tp.rulingcom.com/erictyl/install_r45_on_ubuntu_1804lts_doc/-/raw/master/orbit_logrotate -O /etc/logrotate.d/orbit
 sudo sed -i "s/rulingcom/$USER/g" /etc/logrotate.d/orbit