As a workaround, it's OK to exclude the specific SQL or Exchange VSS writers in Agent's settings. It's advisable to troubleshoot VSS writer for reasons of why it's failing, before excluding VSS Writers. Please involve Microsoft in troubleshooting of VSS Writers if possible.
Note: properly performed VSS operation on SQL or Exchange guarantees, that relevant databases are in the consistent state. Excluding VSS writers will cause a normal disk block-based backup to occur.
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