So the script should contain:
set DLC=c:\DLC
set PATH = %PATH;%DLC%\bin
set ddir = "C:\EUREKA\Eureka 2007\db"
set bdir = E:\ProgressBackups
call %DLC%\bin\probkup %ddir%\eureka %bdir%\2007eureka%date:~6,4%-%date:~3,2%-%date:~0,2%.pbk -com >>c:\backups\backuptask\log.txt
call...