diff --git a/testgres/plugins/__init__.py b/testgres/plugins/__init__.py
index e60331f0..8c19a23b 100644
--- a/testgres/plugins/__init__.py
+++ b/testgres/plugins/__init__.py
@@ -2,8 +2,7 @@
 from pg_probackup2.app import ProbackupApp, ProbackupException
 from pg_probackup2.init_helpers import init_params
 from pg_probackup2.storage.fs_backup import FSTestBackupDir
-from pg_probackup2.storage.s3_backup import S3TestBackupDir
 
 __all__ = [
-    "ProbackupApp", "ProbackupException", "init_params", "FSTestBackupDir", "S3TestBackupDir", "GDBobj"
+    "ProbackupApp", "ProbackupException", "init_params", "FSTestBackupDir", "GDBobj"
 ]
diff --git a/testgres/plugins/pg_probackup2/pg_probackup2/app.py b/testgres/plugins/pg_probackup2/pg_probackup2/app.py
index 6b176488..a8050f94 100644
--- a/testgres/plugins/pg_probackup2/pg_probackup2/app.py
+++ b/testgres/plugins/pg_probackup2/pg_probackup2/app.py
@@ -4,7 +4,6 @@
 import os
 import re
 import subprocess
-import sys
 import threading
 import time
 import unittest
@@ -37,9 +36,10 @@ def __str__(self):
         return '\n ERROR: {0}\n CMD: {1}'.format(repr(self.message), self.cmd)
 
 
-# Local or S3 backup
+# Local backup control
 fs_backup_class = FSTestBackupDir
 
+
 class ProbackupApp:
 
     def __init__(self, test_class: unittest.TestCase,