The present invention provides a novel system and method for failover. In an embodiment, a primary server and a backup server are available to a plurality of clients. Messages containing requests are processed by the primary server, while a mirror image of transaction records generated by the processing of those requests is maintained in volatile memory of both the primary server and the backup server. In case of failover, the client connects to the backup server and resends its message to the backup server. If the backup server has results of processing for the primary server, it sends these to the client. Else the backup server processes the message.