For example, having a copy of the data allows a business to operate in the event of a problem with the first environment.
例如，一个服务器出现故障时，使用该服务器上的数据的备份可使公司正常运营。
The main problem with the previous alternatives for synchronizing files is that they copy every single file (and the associated directory structure).
前面介绍的文件同步方法的主要问题是，它们会复制每个文件(和相关联的目录结构)。
By retaining a copy of the mapping.txt file for each release build, you ensure that you can debug a problem if a user encounters a bug and submits an obfuscated stack trace.
通过保存发布构建版本的mapping . txt文件拷贝，确保当用户碰到bug，并把混淆后的堆栈调试跟踪信息提交给你时，你可以进行调试从而修复问题。
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