This feature is used only in advanced editions of Acronis Backup & Recovery 11.5.
Use of the express full backup method requires the "Express backup and deduplication" add-on and the storage node to be installed. The "Express backup and deduplication" add-on is purchased separately. However, you do not need to purchase and install this add-on if Agent for Windows and its deduplication add-on are already installed on your Exchange server.
The express full backup method allows creating full backups of Exchange information stores, storage groups, or databases in deduplicating vaults. With this method, Acronis Backup & Recovery 11.5 backs up only the changes that have occurred since the previous full backup. The data that has not changed is replaced with links to it in a newly created backup.
As compared to regular full database backups: