Update server.py

server.py

@@ -18,7 +18,7 @@ except ImportError:
     HF_DATASETS_AVAILABLE = False
     Features, Value = None, None
 
-STORAGE_BACKEND_CONFIG = os.getenv("STORAGE_BACKEND", "JSON").upper()
+STORAGE_BACKEND_CONFIG = os.getenv("STORAGE_BACKEND", "HF_DATASET").upper()
 HF_DATASET_REPO = os.getenv("HF_DATASET_REPO")
 HF_TOKEN = os.getenv("HF_TOKEN")
 HF_BACKUP_THRESHOLD = int(os.getenv("HF_BACKUP_THRESHOLD", 10))