Always make an archival copy of a private key before removing it from a database 从数据库删除私钥前,始终对其建立存档副本。
2.
The system is designed to increase the availability of data by allowing file servers to distribute archival copies of files across an arbitrary set of servers 本系统通过将文件分布存储在其它主机上提高了文件数据的有效性。