Fecha de publicación: 09/02/2024 Fuente: Wipo "BigData" The invention provides a big data transaction backup method and system in the technical field of big data transaction, and the method comprises the steps: S10, selecting a server from a server cluster as a host, and taking the rest as slaves; step S20, the seller client puts on the transaction information through the host, and the buyer client firstly purchases the data sample through the transaction information to perform a fusion test and then purchases the big data; step S30, the host stores generated transaction data to a mysq l database of the host in real time in a big data transaction process; step S40, backing up the transaction data to a mysq l database of the slave computer by the host computer, and notarizing the backed-up transaction data through a block chain; step S50, when the operation state of the host is a fault, selecting a server from the slaves with normal operation states as a new host; and step S60, when the fault of the faulted server is recovered, executing data recovery operation. The method has the advantage that the reliability of transaction data backup of big data transaction is greatly improved.