Copy Backups files..

I am using Symantec Backup Exec 2010 R2 to backup jobs ( Weekend full backups & Daily Diff Backups ).  These backups directley saved on NAS storage.

I want to copy Weekend full backup set to exiernal USB drive on next working day usually on Mondays, is there any way to do this task using Symantec Backup ? 

If I use windows task mgr & copy command to do this job can I restore data on this USB device & how ?

Please help me

Thank You in advance....

SanW