I have 3 storages scheduled to be backup everynight. Same command [-vss -vss-timeout 420 -threads 4]. Two storage backup successfully, one is not. This is the error: ERROR VSS_ADD Shadow copy creation failed: AddToSnapshotSet returned 80042308
The schedule time for 3 storage is different, they dont run at the same time.
The backup run smoothly before, but stop working in April 22.
80042308 means pwszVolumeName does not correspond to an existing volume or remote file share according to https://docs.microsoft.com/en-us/windows/win32/api/vsbackup/nf-vsbackup-ivssbackupcomponents-addtosnapshotset`. Maybe that volume wasn’t available when the backup was running?
As a general due diligence, check for possible filesystem corruption.
In the elevated prompt chkdsk c: /f, yes, reboot, wait for check to compete at boot, then try again.
If there are move volumes — schedule check for all volumes.