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Microsoft SQL Server Error 3271 occurs during backup or restore when the system encounters a nonrecoverable I/O error. This can be caused by corrupted backup files, faulty tape drives, outdated drivers, or insufficient permissions. To fix it, check your backup device, update hardware drivers, verify SQL Server has full access to the backup path, and try using a different backup file. If the issue persists, use a reliable software datarecovery.help SQL Database Recovery Tool to repair damaged files and recover your database safely. This ensures complete data restoration without relying on potentially corrupted hardware or backup media.