To try and explain things simply - if you want to backup data to tape that you have already backed up to a Deduplication store then you have 2 options
1) Duplicate the backup sets that are in the deduplication store to tape (thius does rehydrate teh data as it sraores it on tape so wil use more tape space.
2) Backup the Deduplication Store via Shadow Copy Components
Option 1 above should be used where you want to use offsite storage but also need to allow the restore 1 or more individual files. This process actually allows the restore directly to the original server there is no need to recover back into the Deduplication Storage Folder (although you can duplicate a complete backup set back from tape to deduplication if you need to get the files back into the deduplication storage) - Note staging may be needed for GRT sets when restoring from tape.
Option 2 above should ONLY be used to prepare for a full disaster recovery of your deduplication storage folder as you can only restore the complete set of the shadow copy components representing the deduplication folder data and as the process cannot do a merge it would take your deduplication folder back in time (which means you would lose any newer backup sets and would have to re-synch catalogs as well) In other words definitely not good for restore of individual files back to the original servers.
Most customers using deduplication and tape, duplicate backup sets to tape (as per option 1) and may not actually backup the Shadow Copy Components of the Deduplication Folder - but in the event of a disaster elect to create an empty Deduplication folder and then duplicate key backup sets back from tape and run new backups to re-populate the deduplication folder with data.
The other options to protect deduplication (which are used by customers) are
1) Do both 1 and 2 which will use even more tape storage but will give both the DR and the file by file restore requirements
2) Have a second Backup Exec Server also running Deduplication with a CASO/ESO setup and duplicate the backups between deduplication stores (as well as doing tape duplication if offsite storage needed) Hopefully you would not then lose boith Deduplication Stores at the same time and can then recover data from either as needed. (which again should means no need to do the Shadow Copy Backup