Data redundant backup method, data redundant backup system and storage node server based on cloud storage

The invention discloses a data redundant backup method, a data redundant backup system and a storage node server based on cloud storage. The method comprises the following steps: carrying out monitoring on a write operation command by the redundant driving unit of the storage node server; capturing the write operation command of writing data in main equipment by the redundant driving unit, and obtaining the global unique identification (GUID) of the main equipment; finding out corresponding redundant equipment GUID in the mapping relationship according to the main equipment GUID by the redundant driving unit; determining redundant equipment corresponding to the redundant equipment GUID to be online by the redundant driving unit, and writing data written into the main equipment in the redundant equipment. The scheme can realize real-time and quick redundant backup, and avoids logic complexity in the realization by adopting upper application.