diff --git a/scripts/backup b/scripts/backup
index 10a9c9c..8f7e727 100644
--- a/scripts/backup
+++ b/scripts/backup
@@ -3,26 +3,22 @@
 # Exit on command errors and treat unset variables as an error
 set -eu
 
-# The parameter $1 is the backup directory location dedicated to the app
-backup_dir=$1
-
-# The parameter $2 is theid of the app instance
-app=$2
+# Get multi-instances specific variables
+app=$YNH_APP_INSTANCE_NAME
 
 # Source app helpers
 source /usr/share/yunohost/helpers
 
-domain=$(ynh_app_setting_get $app domain)
-final_path=$(ynh_app_setting_get $app final_path)
+# Retrieve app settings
+domain=$(ynh_app_setting_get "$app" domain)
+with_mysql=$(ynh_app_setting_get "$app" with_mysql)
 
 # Copy the app files
-sudo mkdir -p ${backup_dir}/var/www
-sudo cp -a $final_path "${backup_dir}/var/www/$app"
+final_path="/var/www/${app}"
+ynh_backup "$final_path" "sources" 1
 
-# Copy the conf files
-sudo mkdir -p "${backup_dir}/conf"
-sudo cp -a /etc/nginx/conf.d/$domain.d/$app.conf "${backup_dir}/conf/nginx.conf"
-
-# Copy dedicated php-fpm process to backup folder
-sudo cp -a /etc/php5/fpm/pool.d/$app.conf "${backup_dir}/conf/php-fpm.conf"
-sudo cp -a /etc/php5/fpm/conf.d/20-$app.ini "${backup_dir}/conf/php-fpm.ini"
+# Copy the nginx conf files
+ynh_backup "/etc/nginx/conf.d/${domain}.d/${app}.conf" "nginx.conf"
+# Copy the php-fpm conf files
+ynh_backup "/etc/php5/fpm/pool.d/${app}.conf" "php-fpm.conf"
+ynh_backup "/etc/php5/fpm/conf.d/20-${app}.ini" "php-fpm.ini"
diff --git a/scripts/restore b/scripts/restore
index 071f106..28844d0 100644
--- a/scripts/restore
+++ b/scripts/restore
@@ -4,11 +4,8 @@
 # Exit on command errors and treat unset variables as an error
 set -eu
 
-# The parameter $1 is the backup directory location dedicated to the app
-backup_dir=$1
-
 # The parameter $2 is the id of the app instance ex: ynhexample__2
-app=$2
+app=$YNH_APP_INSTANCE_NAME
 
 # Source app helpers
 source /usr/share/yunohost/helpers
@@ -17,36 +14,38 @@ source /usr/share/yunohost/helpers
 domain=$(ynh_app_setting_get $app domain)
 path=$(ynh_app_setting_get $app path)
 is_public=$(ynh_app_setting_get $app is_public)
-final_path=$(ynh_app_setting_get $app final_path)
 
-if [ -d $final_path ]; then
-    ynh_die "There is already a directory: $final_path"
-fi
+# Check domain/path availability
+sudo yunohost app checkurl "${domain}${path}" -a "$app" \
+    || ynh_die "Path not available: ${domain}${path}"
 
-conf=/etc/nginx/conf.d/$domain.d/$app.conf
-if [ -f $conf ]; then
-    ynh_die "There is already a nginx conf file at this path: $conf"
-fi
-# Restore conf files
-sudo cp -a "${backup_dir}/conf/nginx.conf" $conf
+# Check configuration files php-fpm
+nginx_conf="/etc/nginx/conf.d/${domain}.d/${app}.conf"
+[[ -f $nginx_conf ]] && ynh_die \
+"The NGINX configuration already exists at '${nginx_conf}'.
+ You should safely delete it before restoring this app."
+phpfpm_conf="/etc/php5/fpm/pool.d/${app}.conf"
+[[ -f $phpfpm_conf ]] && ynh_die \
+"The PHP FPM configuration already exists at '${phpfpm_conf}'.
+ You should safely delete it before restoring this app."
+phpfpm_ini="/etc/php5/fpm/conf.d/20-${app}.ini"
+[[ -f $phpfpm_ini ]] && ynh_die \
+"The PHP FPM INI configuration already exists at '${phpfpm_ini}'.
+ You should safely delete it before restoring this app."
 
-# Reload Nginx
-sudo service nginx reload
-
-sudo cp -a "${backup_dir}/var/www/$app" $final_path
+ # Restore sources & data
+final_path="/var/www/${app}"
+sudo cp -a ./sources "$final_path"
 
 # Set permissions
 sudo chown -R www-data: $final_path
 
-# Copy dedicated php-fpm process from backup folder to the right location
-sudo cp -a $backup_dir/conf/php-fpm.conf /etc/php5/fpm/pool.d/$app.conf
-sudo cp -a $backup_dir/conf/php-fpm.ini /etc/php5/fpm/conf.d/20-$app.ini
-# And restart service
-sudo service php5-fpm reload
+# Restore nginx configuration files
+sudo cp -a ./nginx.conf   "$nginx_conf"
+# Restore php-fpm configuration files
+sudo cp -a ./php-fpm.conf "$phpfpm_conf"
+sudo cp -a ./php-fpm.ini "$phpfpm_ini"
 
-# Set ssowat config
-if [ "$is_public" = "No" ];
-then
-	ynh_app_setting_delete $app skipped_uris
-fi
-sudo yunohost app ssowatconf
+# Reload services
+sudo service php5-fpm reload || true
+sudo service nginx reload || true
\ No newline at end of file
diff --git a/scripts/upgrade b/scripts/upgrade
index f545195..943d6f9 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -26,27 +26,18 @@ fi
 
 final_path=/var/www/$app
 
-db_name=$app
-
 # Modify Nginx configuration file and copy it to Nginx conf directory
-sed -i "s@PATHTOCHANGE@$path@g" ../conf/nginx.conf*
-sed -i "s@ALIASTOCHANGE@$final_path/@g" ../conf/nginx.conf*
-
-if [ $is_public = "Yes" ];
-then
-	sudo cp ../conf/nginx.conf-public /etc/nginx/conf.d/$domain.d/$app.conf
-else
-	sudo cp ../conf/nginx.conf /etc/nginx/conf.d/$domain.d/$app.conf
-fi
+sed -i "s@__PATHTOCHANGE__@$app@g" ../conf/nginx.conf*
+sed -i "s@__FINALPATH__@$final_path/@g" ../conf/nginx.conf*
 
 # If app is public, add url to SSOWat conf as skipped_uris
-if [[ $is_public -eq 1 ]]; then
-	# See install script
+if [ $is_public = "Yes" ];
+then
 	ynh_app_setting_set "$app" unprotected_uris "/"
-	sudo cp ../conf/nginx.conf-public /etc/nginx/conf.d/$domain.d/$app.conf
+	sudo cp ../conf/nginx.conf /etc/nginx/conf.d/$domain.d/$app.conf
 else
 	sudo cp ../conf/nginx.conf /etc/nginx/conf.d/$domain.d/$app.conf
 fi
 
 # Reload Nginx
-sudo service nginx reload
+sudo service nginx reload
\ No newline at end of file