1. A method for use in a computing system, the method comprising: initiating backup of a shared volume to a backup server by a first node in a computing system, the shared volume being shared by the first node and a second node of the computing system and comprising first data stored in a data storage medium; in response to initiating the backup, conveying from the first node to the second node a query for information identifying a subset of the first data that the second node is configured to backup from the shared volume to the backup server; the second node conveying a response to the query, the response comprising information that identifies the subset of the first data that the second node is configured to backup from the shared volume to the backup server; and the first node completing backup of the shared volume to the backup server, the backup including the first data and excluding the subset of the first data.