RETAIN means that the logging is no longer circular but archival, and therefore you need to have an initial backup before you continue.
RETAIN意味着日志记录不再是循环的，而是归档的，因此需要在继续设置之前进行一次初始备份。
Be sure, of course, to burn backup copies of your digital photos onto archival DVDs.
当然喽，务必要记得备份你的数码照片，并烧录到DVD上保存起来。
You may make a single copy of the products in object code form for archival or backup purposes.
您可以为存档或备份的目的以目标代码的形式制作产品的一份复制品。
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