I have a Windows Server 2008 R2 Standard SP1 64-bit Hyper-V server. In the Hyper-V Manager I have two virtual machines. One is my Small Business Server 2011 Standard SP1 64-Bit and the second is my SQL Windows Server 2008 R2 Standard SP1 64-Bit.
On the Hyper-V machine i have Symantec Backup Exec 2012 installed. It is setup to run full backups on the Hyper-V machine as well as the two Virtual Machines.
Recently, the Hyper-V backups have been failing due to a VSS writer issue. When all three servers have been rebooted and I run the CMD command 'vssadmin list writers' they all show as stable no error. About 1.5 hours into the backup, it failes and when I run the CMD command again, it shows one of the VSS writers - the ASR Writer as  Failed Last Error timed out.
I have logged a case with Symantec and they have said they cannot help me with this. I have researched the issue and some people are saying to re-register the VSS Writers but i have heard that this can break it and will result in re-installing the server. I cant let this happen as i have no decent backups of the server.
I have attached the log for the CMD command when run in Hyper-V after a failed backup, and also the log for the same command I ran on the SBS server (in case that's helpful)
Symantec tried to help by making changes to the backup settings (i have included a picture of the changes they made) but either way it made no difference.
Please help, is there something I can do to resolve this without resorting to a re-install?