单项选择题数据备份通常可分为完全备份、增量备份、差分备份和渐进式备份几种方式。其中将系统中所有选择的数据对象进行一次全面的备份,而不管数据对象自上次备份之后是否修改过的备份方式是()。

A.完全备份
B.增量备份
C.差分备份
D.渐进式备份


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