增量备份系统及方法;BACKUP SYSTEM AND METHOD

摘要

本发明提供一种增量备份系统及方法。该方法包括步骤创建需要备份VM资料的快照，将快照按预设值分成若干小块，生成若干暂存档案；计算每个暂存档案的MD5值；判断是否是初次备份，并在初次备份时，依次判断每个暂存档案的MD5值是否与之前备份的VM资料的每个暂存档案的MD5值相同，确定MD5值不同的暂存档案；在是初次备份时，依次压缩所有暂存档案，及在不是初次备份时，压缩与之前MD5值不同的暂存档案；将压缩后的暂存档案备份；及删除已备份的暂存档案。; calculating MD5 values of each temporarily file; determining if the VM data has ever been stored, determining if the MD5 value of each temporarily file is same as previous MD5 value when the VM data has ever been stored, and determining the temporarily files which have different MD5 values; compressing all temporarily files when the VM data has not ever been stored, and compressing temporarily files which have different MD5 values when the VM data has been stored; backing up compressed files; and deleting the temporarily files that have been backed up.