To clone a user and its objects will take some code. The php clone method will take care of the user and its metadata. You would then have to copy the objects and any other data that you wanted to go go with the new cloned user.

Sorry forgot to mention, as Cash said, you need to copy the data directory too

@Webgalli - I think we are talking about two different things. It sounds like Rick wants to clone a user - meaning have two copies of the same user in a database (with different guids). You are talking about cloning a database.