This mapping is the common practice, but it is not mandatory, though.
这种映射是常见的使用方式，但不是必要的。
Though backing up of data is universally accepted as a mandatory business process, it is also important to understand what data must be backed up and what data should not be backed up.
尽管普遍认为数据备份是一个必不可少的业务过程，但是了解哪些数据必须备份以及哪些数据不应该备份也很重要。
Though backing up of data is universally accepted as a mandatory business process, it is also important to understand what data must be backed up and what data should not be backed up.
尽管普遍认为数据备份是一个必不可少的业务过程，但是了解哪些数据必须备份以及哪些数据不应该备份也很重要。
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