Use the BackupFiles property to specify one or more backup output files. 

The paths are relative to the DB server host. When few files are specified, that corresponds to gsplit functionality. Each file must be specified on a separated line. 

Optionally BackupFiles allows to specify length in bytes of the backup output file. You may specify one length value for each output file except the last. The length may be specified after a backup file name, separated by '='.

property BackupFiles: TStrings;

Database, TADIBRestore

Specifying multiple files with length:

with ADIBBackup1.BackupFiles do begin
  Clear;
  Add('/tmp/addemo.backup1=10000000');
  Add('/tmp/addemo.backup2=10000000');
  Add('/tmp/addemo.backup3');
end;

Specifying single file:

ADIBBackup1.BackupFiles.Text := 'e:\temp\addemo.backup';