You can copy the whole database, related objects, or a single object at a time.

可以一次复制整个数据库、多个相关对象或单个对象。

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This is because a copying collector does not need to visit or copy dead objects, only live ones.

这是因为，拷贝收集器不需要访问或拷贝死对象，只处理活动对象。

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These copy groups contain the crucial attributes that control the expiration of objects of this type (archive or backup objects).

这些副本组包含一些至关重要的属性，这些属性控制着某种类型的对象(归档或备份对象)的到期时间。

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