Make sure you keep copies of all correspondence, including relevant documentation.
所有的来往信函都要有备份，包括相关的证明文档。
Just as you keep copies of all letters in a paper file folder, you should keep copies of all letters on your computer in the directory for that client.
就像把信函的副本保存在一个纸文件夹中一样，您可以将信函的电子副本保存在电脑中专门为该客户建立的文件夹中。
As a DBA, business rules will usually dictate how long you should keep backup copies.
作为一名DBA，业务规则通常会决定您应该保留备份副本的时间长度。
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