There is a WIKI that details the known issues in the server backup for the Colorado products – SBS2011 Essentials, Windows Home Server 2011, and Windows Storage Server 2008 R2 Essentials.
The following issues have been addressed:
- Access Deny for RmMetaData
- VSS failed to create shadow copy
- Backup Conflicts with Exchange Server
- Factory Reset Failed with Error Code 0x80042431
- Another backup is in progress
The WIKI can be found here – http://social.technet.microsoft.com/wiki/contents/articles/11872.server-backup-known-issues-and-resolutions.aspx