diff --git a/files/backups/backup-all.py b/files/backups/backup-all.py
index 52caf28..122cbf2 100644
--- a/files/backups/backup-all.py
+++ b/files/backups/backup-all.py
@@ -4,7 +4,7 @@ Backup script for all applications
 Automatically discovers and runs backup scripts for all users,
 then creates restic backups and sends notifications.
 """
-
+import itertools
 import os
 import sys
 import subprocess
@@ -15,6 +15,7 @@ from pathlib import Path
 from typing import List, Optional
 import requests
 import tomllib
+from collections.abc import Iterable
 
 
 # Configure logging
@@ -35,6 +36,8 @@ except OSError as e:
     logger.error(f"Failed to read config file: {e}")
     raise
 
+ROOTS = config.get("roots") or []
+
 storage_cfg = config.get("storage", {}).get("yandex", {})
 RESTIC_REPOSITORY = storage_cfg.get("restic_repository")
 RESTIC_PASSWORD = storage_cfg.get("restic_password")
@@ -47,6 +50,9 @@ TELEGRAM_BOT_TOKEN = notifications_cfg.get("telegram_bot_token")
 TELEGRAM_CHAT_ID = notifications_cfg.get("telegram_chat_id")
 NOTIFICATIONS_NAME = notifications_cfg.get("notifications_name")
 
+if not isinstance(ROOTS, Iterable) or not ROOTS:
+    raise ValueError("roots must be a non-empty list of paths in config.toml")
+
 if not all(
     [
         RESTIC_REPOSITORY,
@@ -84,8 +90,7 @@ class BackupManager:
     def find_applications(self) -> List[Application]:
         """Get all application directories and their owners."""
         applications: List[Application] = []
-        applications_path = Path("/mnt/applications")
-        source_dirs = applications_path.iterdir()
+        source_dirs = itertools.chain(*(Path(root).iterdir() for root in ROOTS))
 
         for app_dir in source_dirs:
             if "lost+found" in str(app_dir):