If your harddisk does not have sufficient space, consider backing up your files onto a secondary drive, if you have one, or burning it to a CD/DVD. Please note that backing up can take up a lot of disk space.
Remember, this is EA we're talking about.things tend to break. It is also a good idea to back up these files periodically in case something goes wrong, or in case you want to test new hacks or transfer the files to a different computer. This is especially important for saved files and store content that you do not want to redownload.