EWU标识符可以消除重复的值，这些重复的值会破坏和拖延灾难恢复、高可用性和虚拟化过程。
EWU identifiers are required to eliminate the occurrence of duplicate values that will interrupt and delay the processes of disaster recovery, high availability, and virtualization.
前一个操作符在现有文件中追加内容（所以仍然可以恢复数据），后者覆盖现有内容。
The former operator appends to the existing file (so data may still be recovered), and the latter overwrites existing content.
下面的例子执行0级备份，- d选项用于避免当将数据备份到一个目录或者从中恢复数据时出现交互式提示符。
The following example performs level 0 backup and the -d option is used to avoid interactive prompts when backing up to or restoring from a directory.
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