diff --git a/npbackup/__main__.py b/npbackup/__main__.py
index 0dc0501..073fd18 100644
--- a/npbackup/__main__.py
+++ b/npbackup/__main__.py
@@ -428,6 +428,8 @@ This is free software, and you are welcome to redistribute it under certain cond
                 level="error",
             )
             sys.exit(74)
+    # Cheap duplicate filter
+    repos_and_group_repos = list(set(repos_and_group_repos))
 
     # Single repo usage
     if len(repos_and_group_repos) == 1:
@@ -683,15 +685,15 @@ This is free software, and you are welcome to redistribute it under certain cond
         "policy",
         "housekeeping",
         "check",
-        "quick_check",      # TODO: deprecated
-        "full_check",       # TODO: deprecated
+        "quick_check",  # TODO: deprecated
+        "full_check",  # TODO: deprecated
         "prune",
         "prune_max",
         "unlock",
         "repair",
-        "repair_index",     # TODO: deprecated
-        "repair_packs",     # TODO: deprecated
-        "repair_snapshots", # TODO: deprecated
+        "repair_index",  # TODO: deprecated
+        "repair_packs",  # TODO: deprecated
+        "repair_snapshots",  # TODO: deprecated
         "recover",
         "dump",
         "stats",
@@ -700,9 +702,10 @@ This is free software, and you are welcome to redistribute it under certain cond
     )
     if len(repos_and_group_repos) > 1:
         if cli_args["operation"] not in possible_group_ops:
-            json_error_logging(False,
+            json_error_logging(
+                False,
                 f"Invalid group operation {cli_args['operation']}. Valid operations are {','.join(possible_group_ops)}",
-                "critical"
+                "critical",
             )
             sys.exit(74)
         repo_config_list = []