diff --git a/scripts/upgrade b/scripts/upgrade
index 547fa0c..c16f112 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -73,8 +73,16 @@ ynh_secure_remove --file="/etc/apt/sources.list.d/yarn.list"
 #=================================================
 ynh_script_progression --message="Backing up the app before upgrading (may take a while)..."
 
+# Inform the backup/restore process that it should not save the data directory
+# Use only for the previous backup script that doesn't set 'is_big'
+ynh_app_setting_set --app=$app --key=backup_core_only --value=1
+
 # Backup the current version of the app
 ynh_backup_before_upgrade
+
+# Remove the option backup_core_only after the backup.
+ynh_app_setting_delete --app=$app --key=backup_core_only
+
 ynh_clean_setup () {
 	# restore it if the upgrade fails
 	ynh_clean_check_starting