help file for new site files backup feature.

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+<h1>Site Files Used in This Course</h1>
+
+<p>
+This option allows you to choose whether to back up files used in a course from the site files area.
+</p>
+<p>
+Currently the only files that are detected as used in a course are :
+<ul><li><strong>files linked to from questions in the question bank.</strong> All files in the site files area that are linked to in a question that is backed up are also backed up if you select 'yes' for this option.</li></ul>
+</p>
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