Data backup method and apparatus, data restoration method and apparatus, and server

摘要

A data backup method and apparatus, a data restoration method and apparatus, and a server are presented. The backup method includes the following steps of obtaining, by a backup server, an original differential bitmap of a first target volume; obtaining valid data in each fixed-length data block from the first target volume according to the original differential bitmap; saving a bitmap corresponding to a fixed-length data block including the valid data to a fixed-length volume bitmap file of the fixed-length data block according to the original differential bitmap; and saving the valid data in the fixed-length data block to a fixed-length volume file of the fixed-length data block. According to the foregoing solution, only valid data is transmitted, an amount of data transmitted between the production end and the server can be reduced, a transmission speed can be increased, and storage space can be saved.