Dell PowerVault DL2200 - Manual (Page 9)

Table 3: Deduplication Methodology by Use Case
Migrating Data to Tape for Long-Term Storage
An environment with a disk-to-disk-to-tape architecture is fairly common among customers who are interested in
deduplication. It’s important to note that all of the forms of deduplication mentioned here are disk-based.
Deduplicated data is never stored on tape in its deduplicated form; however, the process of migrating deduplicated
data to tape is a simple process. Customers can set up “Set Copy” jobs that copy data from the deduplicated storage
folder to another device, like a tape device, for long-term storage and retention.
These Set Copy jobs are separate jobs, but aside from the typical job configuration information needed to create a
job, Backup Exec handles the details of copying deduplicated data to a tape location.
For data that was backed up using Client or Media Server deduplication, the PowerVault DL Backup to Disk
Appliance will be responsible for recreating whole files from deduplicated data before transferring to tape, so there
will be some impact to processor and memory usage during the Set Copy operation. While resource consumption
varies based on data set, at most the Set Copy process will use 100% of one processor core while performing the Set
Copy.