A backup and restoration processing method performed by a master backup server of a plurality of backup servers, the plurality of backup servers including the master backup server and a plurality of slave backup servers, the plurality of slave backup servers being a plurality of backup execution servers, wherein the method comprises the steps of: • dividing (step 603) a backup and restoration task into a plurality of child backup and restoration tasks, ▪ wherein each child backup and restoration task corresponds to a different backup execution server among the plurality of backup execution servers, and each child backup and restoration task corresponds to a different production server among a plurality of production servers, the plurality of production servers constituting a production system, wherein the division of the backup and restoration task into the plurality of child backup and restoration tasks includes: ∘ determining, for each of the backup execution servers among the plurality of backup execution servers, an initial backup and restoration rate, wherein the initial backup and restoration rate is an initial rate at which the backup execution server is to send to-be-restored data to that production server to which the backup execution server corresponds to, • allocating each child backup and restoration task to that backup execution server to which the child backup and restoration task corresponds to, wherein each child backup and restoration task includes information about its determined initial backup and restoration rate; and • sending (step 604) each child backup and restoration task to that backup execution server to which the child backup and restoration task corresponds to. • dividing (step 603) a backup and restoration task into a plurality of child backup and restoration tasks, ▪ wherein each child backup and restoration task corresponds to a different backup execution server among the plurality of backup execution servers, and each child backup and restoration task corresponds to a different production server among a plurality of production servers, the plurality of production servers constituting a production system, wherein the division of the backup and restoration task into the plurality of child backup and restoration tasks includes: ∘ determining, for each of the backup execution servers among the plurality of backup execution servers, an initial backup and restoration rate, wherein the initial backup and restoration rate is an initial rate at which the backup execution server is to send to-be-restored data to that production server to which the backup execution server corresponds to, ▪ wherein each child backup and restoration task corresponds to a different backup execution server among the plurality of backup execution servers, and each child backup and restoration task corresponds to a different production server among a plurality of production servers, the plurality of production servers constituting a production system, ∘ determining, for each of the backup execution servers among the plurality of backup execution servers, an initial backup and restoration rate, wherein the initial backup and restoration rate is an initial rate at which the backup execution server is to send to-be-restored data to that production server to which the backup execution server corresponds to, • allocating each child backup and restoration task to that backup execution server to which the child backup and restoration task corresponds to, wherein each child backup and restoration task includes information about its determined initial backup and restoration rate; and • sending (step 604) each child backup and restoration task to that backup execution server to which the child backup and restoration task corresponds to. <EOS>