Through the publish interface; instead of publishing to the server, publish down
to your local machine from the server. ( it is a two way thing....).
Or using your FTP program, just publish the pages back to your local machine.
Personally I prefer working on changes on the local machine and uploading changes
as I go. since if you're working straight on the server and you have a lot of
visitor traffic, this might slow things down for you (or them) a bit ??