The pipe between the two (|) feeds the standard output from the first tar into the standard input of the second, effectively copying the files into, and then out of, a non-existent archive file.
两者之间的管道 (|) 将第一个tar 的标准输出传入到第二个 tar的标准输入，并且高效地将文件复制到一个并不存在的存档文件，然后再从其中提取文件。
The second type allocates space out of the original file system, this is known as an internal snapshot.
第二种类型从原始文件系统分配出空间，这种快照称为内部快照。
The second type allocates space out of the original file system, this is known as an internal snapshot.
第二种类型从原始文件系统分配出空间，这种快照称为内部快照。
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