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Home / Backup / Error message when you perform a Volume Shadow Copy Service backup operation: 0x80042409
You perform a Volume Shadow Copy Service (VSS) backup or a VSS restore operation. During the backup or restore operation, an event that resembles the following is written to the Application log:
Volume Shadow Copy Service error: Unexpected error VSS_E_WRITER_STATUS_NOT_AVAILABLE. An older active writer session state is being overwritten by a newer session. The most common cause is that the number of parallel backups has exceeded the maximum supported limit. hr = 0x80042409.