about backup win2k activedirectory ?

[Myron Uong [翁世田]]

 My TSM environment is

 TSM Server 4.2.2.0 on x86 win2k + sp2
 TSM Client 4.2.2.1 on x86 win2k + sp2
when I perform win2k active directory backup. ( dsmc backup activedirectory ) .this 
command description when backup completed . 
tivoli storage delete old log file , but I testing backup win2k activedirectory 
.backup was successful , the old log was not delete . 
how can i fix this .

thanks