Online Backup of NDB Cluster that the reason for the abort was due to a request by the user. (The remaining nodes report that the backup was aborted due to an unspecified internal error.) There is no guarantee that the cluster nodes respond to an  ABORT BACKUP command in any particular order. The  Backup  backup_id  started from node  management_node_id  has been aborted messages mean that the backup has been terminated and that all files relating to this backup have been removed from the cluster file system. It is also possible to abort a backup in progress from a system shell using this command: If there is no backup having the ID  backup_id  running when an  ABORT BACKUP  is issued, the management client makes no response, nor is it indicated in the cluster log that an invalid abort command was sent. Five configuration parameters are essential for backup: The amount of memory used to buffer data before it is written to disk. The amount of memory used to buffer log records before these are written to disk. The total memory allocated in a data node for backups. This should be the sum of the memory allocated for the backup data buffer and the backup log buffer. The default size of blocks written to disk. This applies for both the backup data buffer and the backup log buffer. The maximum size of blocks written to disk. This applies for both the backup data buffer and the backup log buffer. In addition,  CompressedBackup  causes  NDB  to use compression when creating and writing to backup files. More detailed information about these parameters can be found in Backup Parameters. You can also set a location for the backup files using the  BackupDataDir  configuration parameter. The default is  FileSystemPath/BACKUP/BACKUP- backup_id . In NDB 8.0.22 and later, you can enforce encryption of backup files by enabling RequireEncryptedBackup . When this parameter is set to 1, backups cannot be created without specifying  ENCRYPT PASSWORD= password  as part of a  START BACKUP  command. 4495 •  BackupDataBufferSize •  BackupLogBufferSize •  BackupMemory •  BackupWriteSize •  BackupMaxWriteSize 23.5.8.3 Configuration for NDB Cluster Backups Note Note shell>  ndb_mgm -e "ABORT BACKUP  backup_id "