diff --git a/data/helpers.d/filesystem b/data/helpers.d/filesystem
index 88d51750b..903f4b6a0 100644
--- a/data/helpers.d/filesystem
+++ b/data/helpers.d/filesystem
@@ -352,7 +352,8 @@ ynh_backup_if_checksum_is_different () {
 			local backup_file="/home/yunohost.conf/backup/$file.backup.$(date '+%Y%m%d.%H%M%S')"
 			sudo mkdir -p "$(dirname "$backup_file")"
 			sudo cp -a "$file" "$backup_file"	# Backup the current file
-			echo "File $file has been manually modified since the installation or last upgrade. So it has been duplicated in $backup_file" >&2
+			ynh_print_info "File $file has been manually modified since the installation or last upgrade. So it has been duplicated in $backup_file"
+			ynh_print_info "$(git diff --no-index --patch-with-stat $backup_file $file)"
 			echo "$backup_file"	# Return the name of the backup file
 		fi
 	fi