diff --git a/ecs/jskult-batch-ultmarc-io/src/aws/s3.py b/ecs/jskult-batch-ultmarc-io/src/aws/s3.py
index 9c5b8f71..e5dbcb77 100644
--- a/ecs/jskult-batch-ultmarc-io/src/aws/s3.py
+++ b/ecs/jskult-batch-ultmarc-io/src/aws/s3.py
@@ -109,5 +109,5 @@ class VjskSendBucket(S3Bucket):
         # バックアップバケットにコピー
         vjsk_backup_bucket = VjskBackupBucket()
         dat_key = f'{self._send_folder}/{dat_file_key}'
-        backup_key = f'{vjsk_backup_bucket._folder}/{self._send_folder}/{datetime_key}/{dat_file_key.replace(f"{self._send_folder}/", "")}'
+        backup_key = f'{vjsk_backup_bucket._folder}/{datetime_key}/{dat_file_key.replace(f"{self._send_folder}/", "")}'
         self._s3_client.copy(self._bucket_name, dat_key, vjsk_backup_bucket._bucket_name, backup_key)