ns120 - lost putty connection to CS doing server_archive copying, is the task running?

you can try:

ps -ef | grep erver_archive

to see if target file system is growing you can use server_df command

server_df datamover_name fs_name

Next time you need to run something in the background and you are afraid of losing connection, look at using "screen". It's a utility pre-loaded on the control station that allows you to create "virtual" console. You create screen console, start your server_archive command and can disconnect from putty window. You can later on come back and re-connect to your screen console and see everything that was going on while you were disconnected.  You can also use nohup process to send it into background but i found screen to be more useful.  Google both and you will find plenty of examples.