1. A data replicating system including a plurality of nodes, the plurality of nodes receiving a data operation request from a data operation requesting device which replicates a data operation request and transmits the same data operation requests to the plurality of nodes, the data replicating system comprising: a shared storage device that is accessible from the plurality of nodes, wherein each of the nodes includes: a processing device; a permanent storage device; and a temporary storage device, the permanent storage device includes: first memory that stores a data record; and second memory that stores a post-update log of the data record, and the processing device includes: a transmitter that transmits a response to the data operation requesting device when writing, to the temporary storage device of an own node, the post-update log of the data record on executing an operation requested by the data operation request; and a processor that, when a checkpoint time comes, updates the first memory of the own node on a basis of the post-update log of the data record stored in the temporary storage device of the own node, writes the post-update log of the data record stored in the temporary storage device of the own node to the second memory of the own node, and writes, to the shared storage device, checkpoint information including information identifying a latest post-update log written to the second memory; wherein: the processing device of each of the nodes includes: a reader that reads out, from the shared storage device, the checkpoint information written by a node which is failed , estimates the post-update log having possibility of being lost from the temporary storage device of the node which is failed on a basis of the checkpoint information which is read out, reads out the post-update log that is same as the estimated post-update log from the second memory or the temporary storage device of the node other than the node which is failed, and transmits the post-update log which is read out as a post-update log for failure recovery to the node which is failed.