... ---Backup 备份当前系统 ---Restore 还原上一个系统 ---Advanced Restore 高级还原选项（用户可以自选之前备份的系统，然后进行恢复） ...
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应用一个TL之前，您一定要先备份您当前的安装环境，然后要计划一个最坏的情况—在需要的时候将系统回滚到之前的版本。
Before applying a TL, always create a backup of you current installation, and plan on a worst case scenario-on restoring that backup if needed to rollback the system to the previous level.
在数据实际备份前根据用户定义的备份资源树和文件系统当前目录树生成一个待备份的文件列表。
Secondly, they produce the list which includes the files and directories will be backuped based on the selection tree before copy and the present catalog tree of file system.
文件系统备份和恢复过程中，需根据当前备份资源树和历史备份资源树进行合并等操作，这种操作在物理上表现为对目录树和资源树的处理。
During backup and restore of file system, it needs to merge current backup resource tree and previous one, namely operations between catalog tree and resource tree.
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