You can order an archive disc for your site. An archive disc is a backup of everything that has been posted to your site. This includes all pictures, videos, news items, audio, all postings, comments, everything.
An archive disc is useful, if you'd like to delete older items off of your site, but don't want to feel like their gone for good.
Use the "Order Archive Disc" link under the Site Admin > Site Payment tab to order a disc.