This wait type accumulates while requests SQL Server is waiting for a storage level (snapshot) backup to complete. These backups freeze all I/O on the volume to enable backups of large databases to be performed in seconds. Small accumulated values are acceptable. If an individual wait takes over 5 seconds investigation is required.

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Suggested solutions

  1. Make sure snapshot backup drivers and software are up to date.
  2. Ensure snapshot backup drivers and software are configured correctly.
  3. Move non critical files and databases off the snapshot volume (the less I/O to freeze the better).

Additional research

Snapshot Backups
Should I Be Using SAN Snapshots as a Backup Solution?

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