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Even if you are a casual reader and not a contributor to this project, you
are encouraged to download and keep a backup copy of the site database
(~100 MB) and its associated files and images (~2.4 GB) in case this site
goes offline for any reason. The site is open licenced so you are free to copy
this information and publish it elsewhere, either as an exact mirror or as part of
another website. The more people around the world who keep backups, the
better the chances this information will not be lost.