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1·A full backup — in other words, one where you copy all of the files from your system — would obviously capture everything, but it can be an expensive way of backing up your information.

完全备份，即复制系统中所有的文件，很明显这样做可以保存所有的信息，但这可能是一种代价很大的信息备份方式。

2·Since the slave KDC is meant for backing up the master KDC in an emergency, the slave KDC might need to use the read-write copy.

因为从KDC用于在紧急情况下替代主kdc，所以从KDC可能需要使用可读写拷贝。

3·For the new CopyOnWriteArrayList and CopyOnWriteArraySet classes, all mutable operations make a copy of the backing array first, make the change to the copy, and then replace the copy.

对于新的CopyOnWriteArrayList和copyonwritearrayset类，所有可变的(mutable)操作都首先取得后台数组的副本，对副本进行更改，然后替换副本。

4·In addition to backing up the target database with your normal backup software, I suggest keeping a second copy of the data in plain text.

除了用常规备份软件备份目标数据库外，我还建议再保存一份数据的纯文本副本。