For step 1, the tool of choice is rsync, which only downloads changed files.
第1步中，选择的工具是rsync，它只能下载有更改的文件。
A level 1 backup would save all of the files that had changed since the level 0 backup was done.
级备份会保存自从执行0级备份以来更改过的所有文件。
Since Git stores content identified by its SHA-1 hash, if any files were changed then this would immediately show up as a different version of a file.
由于Git存储的内容由其SHA - 1哈希识别，任何文件发生改变，这将会马上展现出文件的不同版本。
Since Git stores content identified by its SHA-1 hash, if any files were changed then this would immediately show up as a different version of a file.
由于Git存储的内容由其SHA - 1哈希识别，任何文件发生改变，这将会马上展现出文件的不同版本。
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