Sumit,
If you are doing a backup to the tftp server I would opt to do it via a .XSF or a text file, I find them easier to use and more reliable if you ever need to restore. You can do that with the "upload configuration" command - it will upload a TXT file of the total config. Here would be the complete command:
upload configuration 10.65.41.4 bill.xsf vr "VR-Default" (substitute IP address and vr where neccessary)
Uploading bill.xsf to 10.65.41.4 ... done! (Showing completion...)
This creates a bill.xsf text file on the TFTP server that you can modify and copy back. You can cut and paste or you can "load script bill" to restore.
Bill