Declare every module's data; the backup holder measures it (hq ADR 0233)

Backup lines are derived from each module's data section instead of written by hand; the holder
measures declared items, reads the array under them, and deletes a retired item only after a last
restore point; the Go providers say each held consumer's size so an empty replacement is seen.

modules/only-office/module.json

@@ -29,6 +29,52 @@
       "why": "the document server over http; its public name is a route grant, and route-proxy reaches it on this published port"
     }
   ],
+  "data": {
+    "own": [
+      {
+        "id": "data",
+        "path": "${dir:data}",
+        "class": "rebuildable",
+        "why": "documents being edited; the documents themselves are the file store's"
+      },
+      {
+        "id": "lib",
+        "path": "${dir:lib}",
+        "class": "rebuildable",
+        "why": "the document server's working files"
+      },
+      {
+        "id": "db",
+        "path": "${dir:db}",
+        "class": "rebuildable",
+        "why": "the document server's own database of editing sessions"
+      },
+      {
+        "id": "fonts",
+        "path": "${dir:fonts}",
+        "class": "rebuildable",
+        "why": "fonts, installed again"
+      },
+      {
+        "id": "logs",
+        "path": "${dir:logs}",
+        "class": "cache",
+        "why": "logs"
+      },
+      {
+        "id": "rabbitmq",
+        "path": "${dir:rabbitmq}",
+        "class": "cache",
+        "why": "its queue's working set"
+      },
+      {
+        "id": "redis",
+        "path": "${dir:redis}",
+        "class": "cache",
+        "why": "its cache"
+      }
+    ]
+  },
   "resources": [
     {
       "id": "state",