from pathlib import Path
from typing import Optional, Dict, Tuple, Any

def storage_setup(config: dict) -> Tuple[Optional[Path], Dict[bytes, Any], int, Dict[bytes, bytes]]:
    storage_path_str = config.get('storage_path')
    if storage_path_str is None:
        storage_path, memory_storage = None, {}
    else:
        storage_path = Path(storage_path_str)
        storage_path.mkdir(parents=True, exist_ok=True)
        memory_storage = None

    timeout = config.get('storage_get_relay_timeout', 5)
    storage_index: Dict[bytes, bytes] = {}
    return storage_path, memory_storage, timeout, storage_index
