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 15.6.5.4 Configuration for Cluster Backup
 .........................................
 
 Four configuration parameters are essential for backup:
 
    * `BackupDataBufferSize'
 
      The amount of memory used to buffer data before it is written to
      disk.
 
    * `BackupLogBufferSize'
 
      The amount of memory used to buffer log records before these are
      written to disk.
 
    * `BackupMemory'
 
      The total memory allocated in a database node for backups.  This
      should be the sum of the memory allocated for the backup data
      buffer and the backup log buffer.
 
    * `BackupWriteSize'
 
      The size of blocks written to disk. This applies for both the
      backup data buffer and the backup log buffer.
 
 More detailed information about these parameters can be found in 
 mysql-cluster-configuration.
 

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