Recovering from a situation where there is no data file backup.
从没有数据文件备份的情形中恢复。
Version control systems are typically used for file backup, parallel development, and change management.
版本控制系统通常用于文件备份、并行开发和变更管理。
For file backup, default name is the name of the original file.
对于文件备份，默认的备份文件名就是当前文件名。
For file backup, default name is the name of the original file.
对于文件备份，默认的备份文件名就是当前文件名。
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