When you go to your privacy settings for your account, you have the option to download the data that you have put up on Portfolium. To get to your privacy settings, you would first click on the "me" avatar on the top of the page, then click on settings. Once you have arrived there, you would then click on the "privacy" tab on the side of the page.
If you want to download that data, follow the steps provided to download an archive of your information.
Note: Once you have created an archive of your work, it will only be available to download for a few days. If you don't download it within that timeframe, you would have to create another archive.