Add car backup, v1

ungleich-car-backup.dot

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+digraph G {
+    node [ shape=box, fontcolor="#ffffff", color="#40a9e3", style="filled"  ]
+    label="vendor neutral car backup by ungleich"
+
+    subgraph cluster_dcl {
+        label="Data Center Light";
+        customer_car_storage [ label="Encrypted storage per user and car" ]
+    }
+
+    subgraph cluster_car {
+        label="Original car, brand 1";
+        microcomputer [ label="ungleich micro computer\n Maybe pcengines APU?" ];
+        carmedia [ label="Regular car media system" ];
+
+        carmedia->microcomputer [ label="Stores user+car based data" ]
+        microcomputer -> customer_car_storage [ label="Backs up data regularly" ];
+
+    }
+
+    subgraph cluster_car2 {
+        label="Replacement car, brand 1";
+        microcomputer2 [ label="ungleich micro computer\n Maybe pcengines APU?" ];
+        carmedia2 [ label="Regular car media system" ];
+
+        carmedia2->microcomputer2 [ label="Stores user+car based data" ]
+        customer_car_storage -> microcomputer2 [ label="Restores data from original car" ];
+    }
+    subgraph cluster_car3 {
+        label="New car, brand 2";
+        microcomputer3 [ label="ungleich micro computer\n Maybe pcengines APU?" ];
+        carmedia3 [ label="Regular car media system" ];
+
+        carmedia3->microcomputer3 [ label="Stores user+car based data" ]
+        customer_car_storage -> microcomputer3 [ label="Restores data from user\nIgnores car specific data from other car" ];
+    }
+
+
+    subgraph cluster_questions {
+        node [ shape=oval ];
+        label="Questions"
+
+        effort_microcomputer [ label="How much effort to design/create microcomputer?" ];
+        effort_sales [ label="How much effort to sell?" ]
+        sales_prob [ label="How likely to sell?" ]
+        approach [ label="How to approach cross-vendor?" ]
+
+    }
+
+}