my one of music site is using 120GB of 160gb hard disk.i cannot make backup of that account as well.i need to move that site to new server..my old host used some commands in ssh through which my whole site moved from one server to second server..i need to know if someone had experience like that and would like to help me out in it

Thanks
kind regards
You can use rsync to copy your complete website from the old server to new one. But you should have root access to both. Below is the command:
/usr/bin/rsync -vrplogDtH -e "ssh" /path/to/source/directory root@DestinationIP:/path/to/destination/directory
You should execute the above command from the source server and for more information for the options used, you can type:
man rsync
at command prompt. Advantage of rsync over scp is that, even if the copy fails for some reason, the next time you start, it will start from where you have left the previous time and not all over again.