Method, system and serving node for data backup and restoration

A method for data backup and restoration, comprising:

• generating, by one of a plurality of serving nodes, a backup schedule, after receipt of a data backup request;
• uploading, by the serving node, the generated backup schedule to a cluster public storage block;
• monitoring, by a target node, the backup schedule in the cluster public storage block and placing the backup schedule to an “enable” state;
• polling, by each of the plurality of serving nodes, the “enable” state of the backup schedule in the cluster public storage block, sending a copy which needs to be backed up to a target node according to the backup schedule, and changing the backup schedule from the “enable” state to a “sent” state;
• polling, by the target node, a “copy completed” state of the backup schedule, and performing consolidation;
• placing, by the target node, the backup schedule to a “consolidation completed” state after the consolidation;
• sending, by a client, a data record in a consolidated copy to the serving node through a data writing request;
• generating, by one of the plurality of serving nodes, a data distribution table according to a load balancing principle;
• sending, by the serving node, the data writing request to other serving nodes to perform a write operation, according to the generated data distribution table;
• and
• sending, by the client, a data writing request for a next data record in the consolidated copy after the write operation is completed, until the copy is completely restored.