diff --git a/dev/common_install.sh b/dev/common_install.sh
index 6517297..02c89c3 100755
--- a/dev/common_install.sh
+++ b/dev/common_install.sh
@@ -10,7 +10,7 @@ PROGRAM_BINARY=$PROGRAM".sh"
 PROGRAM_BATCH=$PROGRAM"-batch.sh"
 SSH_FILTER="ssh_filter.sh"
 
-SCRIPT_BUILD=2019022601
+SCRIPT_BUILD=2019052001
 INSTANCE_ID="installer-$SCRIPT_BUILD"
 
 ## osync / obackup / pmocr / zsnap install script
@@ -66,6 +66,12 @@ SERVICE_DIR_OPENRC=$FAKEROOT/etc/init.d
 
 if [ "$PROGRAM" == "osync" ]; then
 	SERVICE_NAME="osync-srv"
+	TARGET_HELPER_SERVICE_NAME="osync-target-helper-srv"
+
+	TARGET_HELPER_SERVICE_FILE_INIT="$TARGET_HELPER_SERVICE_NAME"
+	TARGET_HELPER_SERVICE_FILE_SYSTEMD_SYSTEM="$TARGET_HELPER_SERVICE_NAME@.service"
+	TARGET_HELPER_SERVICE_FILE_SYSTEMD_USER="$TARGET_HELPER_SERVICE_NAME@.service.user"
+	TARGET_HELPER_SERVICE_FILE_OPENRC="$TARGET_HELPER_SERVICE_NAME-openrc"
 elif [ "$PROGRAM" == "pmocr" ]; then
 	SERVICE_NAME="pmocr-srv"
 fi
@@ -283,6 +289,16 @@ function CopyServiceFiles {
 			CreateDir "$SERVICE_DIR_SYSTEMD_USER"
 			CopyFile "$SCRIPT_PATH" "$SERVICE_DIR_SYSTEMD_USER" "$SERVICE_FILE_SYSTEMD_USER" "$SERVICE_FILE_SYSTEMD_USER" "" "" "" true
 		fi
+
+		if [ -f "$SCRIPT_PATH/$TARGET_HELPER_SERVICE_FILE_SYSTEMD_SYSTEM" ]; then
+			CopyFile "$SCRIPT_PATH" "$SERVICE_DIR_SYSTEMD_SYSTEM" "$TARGET_HELPER_SERVICE_FILE_SYSTEMD_SYSTEM" "$SERVICE_FILE_SYSTEMD_SYSTEM" "" "" "" true
+			Logger "Created optional service [$TARGET_HELPER_SERVICE_NAME] with same specifications as below." "NOTICE"
+		fi
+		if [ -f "$SCRIPT_PATH/$TARGET_HELPER_SERVICE_FILE_SYSTEMD_USER" ]; then
+			CopyFile "$SCRIPT_PATH" "$SERVICE_DIR_SYSTEMD_USER" "$TARGET_HELPER_SERVICE_FILE_SYSTEMD_USER" "$SERVICE_FILE_SYSTEMD_USER" "" "" "" true
+		fi
+
+
 		Logger "Created [$SERVICE_NAME] service in [$SERVICE_DIR_SYSTEMD_SYSTEM] and [$SERVICE_DIR_SYSTEMD_USER]." "NOTICE"
 		Logger "Can be activated with [systemctl start SERVICE_NAME@instance.conf] where instance.conf is the name of the config file in $CONF_DIR." "NOTICE"
 		Logger "Can be enabled on boot with [systemctl enable $SERVICE_NAME@instance.conf]." "NOTICE"
@@ -290,14 +306,20 @@ function CopyServiceFiles {
 	elif ([ "$init" == "initV" ] && [ -f "$SCRIPT_PATH/$SERVICE_FILE_INIT" ] && [ -d "$SERVICE_DIR_INIT" ]); then
 		#CreateDir "$SERVICE_DIR_INIT"
 		CopyFile "$SCRIPT_PATH" "$SERVICE_DIR_INIT" "$SERVICE_FILE_INIT" "$SERVICE_FILE_INIT" "755" "" "" true
-
+		if [ -f "$SCRIPT_PATH/$TARGET_HELPER_SERVICE_FILE_INIT" ]; then
+			CopyFile "$SCRIPT_PATH" "$SERVICE_DIR_INIT" "$TARGET_HELPER_SERVICE_FILE_INIT" "$SERVICE_FILE_INIT" "755" "" "" true
+			Logger "Created optional service [$TARGET_HELPER_SERVICE_NAME] with same specifications as below." "NOTICE"
+		fi
 		Logger "Created [$SERVICE_NAME] service in [$SERVICE_DIR_INIT]." "NOTICE"
 		Logger "Can be activated with [service $SERVICE_FILE_INIT start]." "NOTICE"
 		Logger "Can be enabled on boot with [chkconfig $SERVICE_FILE_INIT on]." "NOTICE"
 	elif ([ "$init" == "openrc" ] && [ -f "$SCRIPT_PATH/$SERVICE_FILE_OPENRC" ] && [ -d "$SERVICE_DIR_OPENRC" ]); then
 		# Rename service to usual service file
 		CopyFile "$SCRIPT_PATH" "$SERVICE_DIR_OPENRC" "$SERVICE_FILE_OPENRC" "$SERVICE_FILE_INIT" "755" "" "" true
-
+		if [ -f "$SCRPT_PATH/$TARGET_HELPER_SERVICE_FILE_OPENRC" ]; then
+			CopyFile "$SCRIPT_PATH" "$TARGET_HELPER_SERVICE_DIR_OPENRC" "$SERVICE_FILE_OPENRC" "$SERVICE_FILE_INIT" "755" "" "" true
+			Logger "Created optional service [$TARGET_HELPER_SERVICE_NAME] with same specifications as below." "NOTICE"
+		fi
 		Logger "Created [$SERVICE_NAME] service in [$SERVICE_DIR_OPENRC]." "NOTICE"
 		Logger "Can be activated with [rc-update add $SERVICE_NAME.instance] where instance is a configuration file found in /etc/osync." "NOTICE"
 	else