Is there a way to remove e-mails (in mass, ex: an entire folder at a time) from my GroupWise to save space on the server and improve the speed of my inbox, sent folder and folders in my cabinet yet keep the back-up e-mails easy to access for reference?

I have copied and pasted folders to a CD for back-up (suggested to me in past) and it works great until you delete the folders from GroupWise and then the back-up is blank!

Any ideas, suggestions, advise?