Online Backup of NDB Cluster WAIT {STARTED | COMPLETED} | NOWAIT snapshot_option : SNAPSHOTSTART | SNAPSHOTEND ndb_mgm>  START BACKUP NOWAIT ndb_mgm> ndb_mgm>  START BACKUP WAIT STARTED 4492 • With  WAIT STARTED  the management client waits until the backup has started before returning control to the user, as shown here: • If  NOWAIT  is specified, the management client displays a prompt immediately, as seen here: • ndb_mgm --backup-password-from-stdin --execute "START BACKUP ..." • ndb_print_backup_file --backup-password-from-stdin file_name • ndb_print_backup_file --backup-password= password file_name • ndbxfrm --decrypt-password-from-stdin input_file output_file • ndb_restore --decrypt --backup-password-from-stdin • ndbxfrm --decrypt-password= password input_file output_file • ndb_print_backup_file -P password file_name • ndb_restore --decrypt --backup-password= password •Uses any of the printable ASCII characters except  ! ,  ’ ,  " ,  $ ,  % ,  \ , and  ^ •Is no more than 256 characters in length •Is enclosed by single or double quotation marks Successive backups are automatically identified sequentially, so the  backup_id , an integer greater than or equal to 1, is optional; if it is omitted, the next available value is used. If an existing  backup_id value is used, the backup fails with the error  Backup failed: file already exists . If used, the backup_id  must follow  START BACKUP  immediately, before any other options are used. NDB 8.0.22 and later supports the creation of encrypted backups using  ENCRYPT PASSWORD= password ; the  password  must meet all of the following requirements: Starting with NDB 8.0.24, the  PASSWORD  clause can be omitted from  encryption_option . In this case, the management client prompts the user for a password. It is possible using  PASSWORD  to set an empty password ( ’’  or  "" ), but this is not recommended. An encrypted backup can be decrypted using any of the following commands: NDB 8.0.24 and later supports the additional commands listed here: See the descriptions of these programs for more information, such as additional options that may be required. The  wait_option  can be used to determine when control is returned to the management client after a START BACKUP  command is issued, as shown in the following list: In this case, the management client can be used even while it prints progress information from the backup process.