A solution is proposed for managing each one of a plurality of computing machines. A corresponding method comprises taking one or more snapshots of the computing machine or part thereof, the snapshots being organized in a snapshot tree of nodes representing the snapshots according to a dependency thereof, expanding the snapshot tree of the computing machine according to each sub-tree of the snapshot tree of each other computing machine having the snapshot of a parent node of the sub-tree matching a graft node of the snapshot tree of the computing machine, the sub-tree being appended to the graft node, selecting a snapshot of the other computing machines represented by a selected node of the snapshot tree of the computing machine, and restoring the selected snapshot on the computing machine.