A backup of System State to deduplication storage with Backup Exec 2012, is slower than Backup Exec 2010 R3.
A hotfix is now available for this issue in the current version(s) of the product(s) mentioned in this article. Refer to the Hotfix link under Related Articles at the end of this article to obtain the hotfix needed to resolve the issue.
Backup Exec 2012 Rev 1798 Hotfix 201596. Device Driver Installer DDI20121215 (December 15th, 2012) (TECH201596)