I have Win2K3 Server SP2 with Exch 2k3 installed. It worked fine but some days ago started to fail jobs. It looks like the problem with MS Exchange Writer. It always state:Failed after backup. Tried to reboot the server but had the same situation(it is Stable before job and Failed  after). Circular Logging is not enabled.
DoI need to install some system patches? If yes, where can I find the list
savegrp: suppressed 7 lines of verbose output
49931:nsrsnap_vss_save:RM .. 026202 ERROR: Storage Services operation waitVSSCompletion failed with an error as follows: Wait Snapshot completion failed.
49931:nsrsnap_vss_save:RM .. 026084 ERROR:Storage Services operation processExecute failed with an error as follows: Storage Services has terminated with an error.
49931:nsrsnap_vss_save:RM .. 100752 ERROR:Exchange: no VSS writer error. The code is: 0x00000000. Check the client and application event logs for more information.
63335:nsrsnap_vss_save:NMM backup failed to complete successfully.