Still having this issue with VSS snapshots failing on random Windows 2012R2 servers. When this occurs, much of the time the file scan will fail, retry, fail,retry...etc and eventually succeed . The rest of the time the backup will ultimately fail. If I turn off system state backups, the jobs succeed.
i can get a report showing the fails, but is there a report I can run that would list jobs where the file scan failed one or more times before the backup succeeded? Am try to see if I can localize the problem. The options "complete with errors" does not do this.
Also, now when looking at the vss writers that fail, it is not always the same ones.
System writer, WMI writer, BITS Writer most always, but occasionally others as well.