Greetings to you 
I'm tired from searching in Google about " how to save current firmware in switch to PC , The main goal from this is take a backup   
I Know how to save config file to my pc it's easy by using this command 
    A4(su)->show config outfile  configs/mysave.cfg
        A4(su)->copy configs/mysave.cfg  tftp://10.10.10.15/Ali_j_albasri.txt
    File transfer operation completed  successfully.
    so the above command using to save config file to my PC using TFPT , 
we know in Cisco you can save IOS Image by using IOS name and TFTP
Like this command 
copy flash/c2960-lanbase-mz.122-25.SEE2/c2960-lanbase-mz.122-25.SEE2.bin tftp:server
so i want to do that in Enterasys switches