HP B6960-96035 - Manual (Page 119)

Figure 34 Disk staging concept
Disk staging also eliminates the need for frequent backups of numerous small objects
to tape. Such backups are inconvenient due to frequent loading and unloading of
media. The use of disk staging reduces backup time and prevents media deterioration.
Object mirroring
What is object mirroring?
The Data Protector object mirror functionality enables writing the same data to several
media sets simultaneously during a backup session. You can mirror all or some
backup objects to one or more additional media sets.
Concepts guide 119