Moving a Sims 3 game I created in one computer to another computer

Do you have to copy the whole save folder or just the world you want?? I'm trying to do the same, moving from desktop to laptop. The game I'm trying to move tho has 2 extra expansion packs more than my laptop. Will that give me an issue??

Only carry over the stuff you want to keep. More EPs is usually not an issue, less is for existing games.

Here's an explanation of the user files: http://sims3.crinrict.com/en/2011/01/faq-user-files.html

I had the same question and am able to find the file. I was wondering if you could move the folder onto the external hard drive instead of copying each time so that the saves go directly to the hard drive every time you hit save or if this will mess up the system?