diff --git a/data/hostname/thyssen.internal.softwareheritage.org.yaml b/data/hostname/thyssen.internal.softwareheritage.org.yaml
--- a/data/hostname/thyssen.internal.softwareheritage.org.yaml
+++ b/data/hostname/thyssen.internal.softwareheritage.org.yaml
@@ -5,3 +5,6 @@
   ddouard:
     groups:
       - sudo
+
+dar::backup::exclude:
+  - /var/lib/docker/