diff --git a/scripts/backup b/scripts/backup
index 89f6257..14de8e1 100644
--- a/scripts/backup
+++ b/scripts/backup
@@ -18,7 +18,7 @@ ynh_abort_if_errors
 #=================================================
 # LOAD SETTINGS
 #=================================================
-ynh_print_info --message="Backing up Converse..."
+ynh_print_info --message="Loading installation settings..."
 
 app=$YNH_APP_INSTANCE_NAME
 
@@ -46,4 +46,4 @@ ynh_backup --src_path="/etc/nginx/conf.d/$domain.d/$app.conf"
 # END OF SCRIPT
 #=================================================
 
-ynh_print_info --message="Backup script completed for Converse. (YunoHost will then actually copy those files to the archive)."
+ynh_print_info --message="Backup script completed for $app. (YunoHost will then actually copy those files to the archive)."
diff --git a/scripts/change_url b/scripts/change_url
index a0de805..1148530 100644
--- a/scripts/change_url
+++ b/scripts/change_url
@@ -34,7 +34,7 @@ final_path=$(ynh_app_setting_get --app=$app --key=final_path)
 #=================================================
 # BACKUP BEFORE UPGRADE THEN ACTIVE TRAP
 #=================================================
-ynh_script_progression --message="Backing up Converse before changing its URL (may take a while)..." --weight=2
+ynh_script_progression --message="Backing up the app before changing its URL (may take a while)..." --weight=2
 
 # Backup the current version of the app
 ynh_backup_before_upgrade
@@ -104,4 +104,4 @@ ynh_systemd_action --service_name=nginx --action=reload
 # END OF SCRIPT
 #=================================================
 
-ynh_script_progression --message="Change of URL completed for Converse" --last
+ynh_script_progression --message="Change of URL completed for $app" --last
diff --git a/scripts/install b/scripts/install
index 4b8e439..5b26b47 100755
--- a/scripts/install
+++ b/scripts/install
@@ -46,6 +46,14 @@ ynh_script_progression --message="Storing installation settings..." --weight=2
 ynh_app_setting_set --app=$app --key=domain --value=$domain
 ynh_app_setting_set --app=$app --key=path --value=$path_url
 
+#=================================================
+# CREATE DEDICATED USER
+#=================================================
+ynh_script_progression --message="Configuring system user..." --weight=1
+
+# Create a system user
+ynh_system_user_create --username=$app --home_dir="$final_path"
+
 #=================================================
 # STANDARD MODIFICATIONS
 #=================================================
@@ -61,6 +69,10 @@ mkdir -p $final_path && cp -a ../sources/* $final_path
 ynh_replace_string --match_string="__PATH__" --replace_string="$path_url" --target_file="$final_path/index.html"
 ynh_replace_string --match_string="__DOMAIN__" --replace_string="$domain" --target_file="$final_path/index.html"
 
+chmod 750 "$final_path"
+chmod -R o-rwx "$final_path"
+chown -R $app:www-data "$final_path"
+
 #=================================================
 # NGINX CONFIGURATION
 #=================================================
@@ -69,15 +81,6 @@ ynh_script_progression --message="Configuring NGINX web server..." --weight=2
 # Create a dedicated NGINX config
 ynh_add_nginx_config
 
-#=================================================
-# GENERIC FINALIZATION
-#=================================================
-# SECURE FILES AND DIRECTORIES
-#=================================================
-
-# Set permissions to app files
-chown -R root: $final_path
-
 #=================================================
 # SETUP SSOWAT
 #=================================================
@@ -99,4 +102,4 @@ ynh_systemd_action --service_name=nginx --action=reload
 # END OF SCRIPT
 #=================================================
 
-ynh_script_progression --message="Installation of Converse completed" --last
+ynh_script_progression --message="Installation of $app completed" --last
diff --git a/scripts/remove b/scripts/remove
index 5515180..b07dbbe 100755
--- a/scripts/remove
+++ b/scripts/remove
@@ -23,11 +23,19 @@ final_path=$(ynh_app_setting_get --app=$app --key=final_path)
 #=================================================
 # REMOVE APP MAIN DIR
 #=================================================
-ynh_script_progression --message="Removing Converse main directory..." --weight=3
+ynh_script_progression --message="Removing app main directory..." --weight=3
 
 # Remove the app directory securely
 ynh_secure_remove --file="$final_path"
 
+#=================================================
+# REMOVE DEDICATED USER
+#=================================================
+ynh_script_progression --message="Removing the dedicated system user..." --weight=1
+
+# Delete a system user
+ynh_system_user_delete --username=$app
+
 #=================================================
 # REMOVE NGINX CONFIGURATION
 #=================================================
@@ -40,4 +48,4 @@ ynh_remove_nginx_config
 # END OF SCRIPT
 #=================================================
 
-ynh_script_progression --message="Removal of Converse completed" --last
+ynh_script_progression --message="Removal of $app completed" --last
diff --git a/scripts/restore b/scripts/restore
index e7611d4..13a821f 100644
--- a/scripts/restore
+++ b/scripts/restore
@@ -43,19 +43,24 @@ test ! -d $final_path \
 
 ynh_restore_file --origin_path="/etc/nginx/conf.d/$domain.d/$app.conf"
 
+#=================================================
+# RECREATE THE DEDICATED USER
+#=================================================
+ynh_script_progression --message="Recreating the dedicated system user..." --weight=1
+
+# Create the dedicated user (if not existing)
+ynh_system_user_create --username=$app --home_dir="$final_path"
+
 #=================================================
 # RESTORE THE APP MAIN DIR
 #=================================================
-ynh_script_progression --message="Restoring Converse main directory..." --weight=2
+ynh_script_progression --message="Restoring the app main directory..." --weight=2
 
 ynh_restore_file --origin_path="$final_path"
 
-#=================================================
-# RESTORE USER RIGHTS
-#=================================================
-
-# Restore permissions on app files
-chown -R root: $final_path
+chmod 750 "$final_path"
+chmod -R o-rwx "$final_path"
+chown -R $app:www-data "$final_path"
 
 #=================================================
 # GENERIC FINALIZATION
@@ -70,4 +75,4 @@ ynh_systemd_action --service_name=nginx --action=reload
 # END OF SCRIPT
 #=================================================
 
-ynh_script_progression --message="Restoration completed for Converse" --last
+ynh_script_progression --message="Restoration completed for $app" --last
diff --git a/scripts/upgrade b/scripts/upgrade
index 2ef7ba6..74b243e 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -25,6 +25,20 @@ final_path=$(ynh_app_setting_get --app=$app --key=final_path)
 
 upgrade_type=$(ynh_check_app_version_changed)
 
+#=================================================
+# BACKUP BEFORE UPGRADE THEN ACTIVE TRAP
+#=================================================
+ynh_script_progression --message="Backing up the app before upgrading (may take a while)..." --weight=3
+
+# Backup the current version of the app
+ynh_backup_before_upgrade
+ynh_clean_setup () {
+	# restore it if the upgrade fails
+	ynh_restore_upgradebackup
+}
+# Exit if an error occurs during the execution of the script
+ynh_abort_if_errors
+
 #=================================================
 # ENSURE DOWNWARD COMPATIBILITY
 #=================================================
@@ -44,18 +58,12 @@ if ynh_legacy_permissions_exists; then
 fi
 
 #=================================================
-# BACKUP BEFORE UPGRADE THEN ACTIVE TRAP
+# CREATE DEDICATED USER
 #=================================================
-ynh_script_progression --message="Backing up Converse before upgrading (may take a while)..." --weight=3
+ynh_script_progression --message="Making sure dedicated system user exists..." --weight=1
 
-# Backup the current version of the app
-ynh_backup_before_upgrade
-ynh_clean_setup () {
-	# restore it if the upgrade fails
-	ynh_restore_upgradebackup
-}
-# Exit if an error occurs during the execution of the script
-ynh_abort_if_errors
+# Create a dedicated user (if not existing)
+ynh_system_user_create --username=$app --home_dir="$final_path"
 
 #=================================================
 # DOWNLOAD, CHECK AND UNPACK SOURCE
@@ -74,6 +82,10 @@ then
 	ynh_replace_string --match_string="__DOMAIN__" --replace_string="$domain" --target_file="$final_path/index.html"
 fi
 
+chmod 750 "$final_path"
+chmod -R o-rwx "$final_path"
+chown -R $app:www-data "$final_path"
+
 #=================================================
 # NGINX CONFIGURATION
 #=================================================
@@ -82,13 +94,6 @@ ynh_script_progression --message="Upgrading NGINX web server configuration..." -
 # Create a dedicated NGINX config
 ynh_add_nginx_config
 
-#=================================================
-# SECURE FILES AND DIRECTORIES
-#=================================================
-
-# Set permissions on app files
-chown -R root: $final_path
-
 #=================================================
 # RELOAD NGINX
 #=================================================
@@ -100,4 +105,4 @@ ynh_systemd_action --service_name=nginx --action=reload
 # END OF SCRIPT
 #=================================================
 
-ynh_script_progression --message="Upgrade of Converse completed" --last
+ynh_script_progression --message="Upgrade of $app completed" --last