Add Btrfs offline dedupe

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   </ul>
 </div>
 
+<div class="slide">
+  <h1>Btrfs offline dedupe [3.12]</h1>
+  <ul class="incremental">
+    <li>
+      Btrfs generally does COW rather than updating in-place, allowing
+      snapshots and file copies to defer the actual copying and save
+      space
+    </li>
+    <li>
+      Filesystems may still end up with multiple copies of the same
+      file content
+    </li>
+    <li>
+      Btrfs doesn't actively merge these duplicates, but userland can
+      tell it to do so
+    </li>
+    <li>
+      Many file dedupe tools are packaged for Debian, but not one that
+      works with this Btrfs feature, e.g. bedup
+    </li>
+  </ul>
+</div>
+
 <div class="slide">
   <h1>Questions?</h1>
 </div>