Remove backup (down)

Author: Pavol Klacansky

data/header.html

@@ -508,7 +508,7 @@
 	</code>
 </div>
 
-<p><strong>Please, cite individual datasets to support authors (some have BibTeX). <a href="http://open-scivis-datasets.sci.utah.edu">Backup</a> is hosted by SCI Institute and NSDF project.</strong>
+<p><strong>Please, cite individual datasets to support authors (some have BibTeX).</strong>
 
 <p>All datasets are in little-endian byte order. Dimensions are width x height x depth (e.g., array[depth][height][width] in C).