If you need to move your WSUS content you can do so with the wsusutil.exe tool from the Update Services installation folder.  However you may find a little gotcha when you try to move the files, the error

Fatal error: unable to access the log path because of the following error: Access is denied

Well the issue is not always the permissions but actually a bit of semantics.  The command for the move is

wsusuitl movecontent E:\myPath E:\myLog

What the syntax does not say is that you have to specify the logfile name and not just the location, the file will not be created for you.  You must specify the extension .log

Its an easy gotcha to fall for and it had me for over 20 minutes before I sussed it!