Re: What about my sims 3 store content when EA close down the sims 3 store?
in your ea/thesims3 is a downloads folder with all your store items and or downloaded sims/lots/free items/reg itmes from the exchange i have that folder copied twice to different usb devices one a thumb/flash drive the other a portable harddrive just anytime you buy or get something new and install it make a fresh copy of the downloads folder some months back i had to reinstall my games all i had to do was open my backed up downloads folder install my store items that way saves all that time and trouble of downloading from the site
edit to add this blog post by crin there is links at the bottom the page which will take you to a guide on what to back up and another for files explained
http://sims3.crinrict.com/en/2011/03/faq-what-files-should-i-backup.html