Working with backup sets : VSS-aware backup sets (Windows) : About VSS-aware backup sets : Database backup policy for VSS-aware backup sets
 
Database backup policy for VSS-aware backup sets
The database Incremental backup and/or Differential backup options are available in the Backup Set Options section, if the target server supports this feature. These are the same options as for online Microsoft SQL Server backup sets. For VSS-aware backup sets, the Database Backup Policy options appear for supported Microsoft SQL Servers, Microsoft Exchange Servers, and Microsoft SharePoint Servers. The Hyper-V backup policy options appear for Microsoft Hyper-V Servers (standalone and cluster).
For more information on database backup policy options, see the Knowledge Base article in “Backup / restore of Microsoft SQL Server (all versions)”.
For more information on Microsoft Hyper-V backup policy options, see the Knowledge Base article in “Backup / restore of Microsoft Hyper-V Server (VSS-aware) backup sets”.