I have some problems with Exchange VSS backup,the backup runs every day and always fails in different days not on a specific day
the service is initiated by domain admin user,
client version 6.1.101-87
2013-07-14 00:43:11 avtar Error <12450>: Volume path "G:\" not found -- No files from this volume will be saved (Log #1)
2013-07-14 00:43:12 avtar Error <5244>: Unable to open directory "G:\" (code 3: The system cannot find the path specified). (Log #1)
2013-07-14 01:09:48 avexvss Error <13117>: Unable to successfully process backup workorder SCHED_10PM_6AM-GRP_CRITICIDAD_5_CORREO-1373774400164#1, targets C:\ExchangeServer\V14\Mailbox\Public Folder Database 0697583408\Public Folder Database 0697583408.edb (Log #3)
2013-07-14 01:09:48 avexvss Error <13066>: Failed to process backup workorder. (Log #3)
2013-07-14 01:09:55 avexvss Error <13077>: Unable to complete backup. (Log #3)
2013-07-14 01:09:48 avexvss Error <13117>: Unable to successfully process backup workorder SCHED_10PM_6AM-GRP_CRITICIDAD...
Which Exchange databases are you trying to backup and what are the paths to their data and log files? It looks like the G:\ volume is not accessible and your public folder database is on the C:\ drive? Are there any events in the system or application event logs around the time the backup fails?
I guess the reason may the avtar cannot stable to access the G:\ volume. Suggested you to check it, and then ensure that avtar has continuous and stable accessibility for the G:\ volume.