1·Slave servers (for example, those machines that want to provide a backup copy of NIS master databases) copy the published databases from the server.
从服务器（例如希望提供 NIS 主服务器数据库备份的计算机）将从服务器复制已发布的数据库。
2·Making a backup copy of the file now may save you even more heartache later on.
即刻进行文件备份有可能避免随后遭受更致命的打击。
3·You can't, because the file was saved; there is no UNDO here, so the programmer would need to either recover the backup copy or retype it.
不能使用它，因为文件已被保存；此处没有UNDO命令，因此，程序员需要恢复备份或重新输入。
4·The management classes consist of archive and backup copy groups.
管理类由归档和备份副本组组成。
5·If you do choose to remove the JDKs, make a backup copy just in case for future use.
如果您选择删除该JDK，请做一下备份以防将来使用。