当删除实例时，实例将被停止，并且在临时文件系统中的数据也将被删除且不能恢复，因此，需要把重要的数据保存到其他的存储系统上。
When you delete the instance, the instance is halted and the data in the ephemeral file system is deleted and is not recoverable, so you have to keep important data on other storage systems.
系统管理：数据管理、数据仓库安全性、系统和数据库的备份和恢复，等等。
System management: data management, data warehouse security, system and database backup and recovery, and so on.
这样就可以保证系统恢复后数据和文件系统的一致性。
In this way, data and file system are guaranteed consistent after a recovery.
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