diff --git a/manifest.json b/manifest.json
index a167b30..12bf24f 100644
--- a/manifest.json
+++ b/manifest.json
@@ -11,14 +11,14 @@
         "name": "kload",
         "email": "kload@kload.fr"
     },
-    "multi_instance": "true",
+    "multi_instance": true,
     "services": [
         "nginx",
         "php5-fpm",
         "mysql"
     ],
     "requirements": {
-        "yunohost": ">= 2.3.10"
+        "yunohost": ">= 2.3.15"
     },
     "arguments": {
         "install" : [
diff --git a/scripts/backup b/scripts/backup
index 14b17f5..2f24495 100644
--- a/scripts/backup
+++ b/scripts/backup
@@ -18,11 +18,11 @@ dbpass=$(ynh_app_setting_get $app mysqlpwd)
 
 # Copy the app files
 DESTDIR="/var/www/$app"
-sudo cp -a "$DESTDIR" ./sources
+ynh_backup "$DESTDIR" "sources"
 
 # Copy the conf files
-sudo cp -a "/etc/nginx/conf.d/${domain}.d/${app}.conf" ./nginx.conf
-sudo cp -a "/etc/php5/fpm/pool.d/${app}.conf" ./php-fpm.conf
+ynh_backup "/etc/nginx/conf.d/${domain}.d/${app}.conf" "nginx.conf"
+ynh_backup "/etc/php5/fpm/pool.d/${app}.conf" "php-fpm.conf"
 
 # Dump the database
 mysqldump -u "$dbuser" -p"$dbpass" --no-create-db "$dbname" > ./dump.sql