diff --git a/electron/remote-sync-entities.cjs b/electron/remote-sync-entities.cjs
index a60ce8c43..8bda0be61 100644
--- a/electron/remote-sync-entities.cjs
+++ b/electron/remote-sync-entities.cjs
@@ -10,6 +10,9 @@ const SYNCED_ENTITY_TYPES = Object.freeze([
   "dashboardServiceLinks",
   "homepageItems",
   "userPreferences",
+  // networkTopology stores host references by their local numeric id inside
+  // the topology JSON, so it must sync after hosts have been reconciled.
+  "networkTopology",
 ]);
 
 module.exports = { SYNCED_ENTITY_TYPES };
diff --git a/src/backend/database/repositories/sync-tombstone-repository.ts b/src/backend/database/repositories/sync-tombstone-repository.ts
index a0378aaee..19af5e64a 100644
--- a/src/backend/database/repositories/sync-tombstone-repository.ts
+++ b/src/backend/database/repositories/sync-tombstone-repository.ts
@@ -14,7 +14,8 @@ export type SyncEntityType =
   | "vaultProfiles"
   | "dashboardServiceLinks"
   | "homepageItems"
-  | "userPreferences";
+  | "userPreferences"
+  | "networkTopology";
 
 export class SyncTombstoneRepository {
   constructor(
diff --git a/src/backend/database/routes/sync-references.ts b/src/backend/database/routes/sync-references.ts
index 1c4e0dc81..a10e4132f 100644
--- a/src/backend/database/routes/sync-references.ts
+++ b/src/backend/database/routes/sync-references.ts
@@ -2,6 +2,79 @@ import type { SyncEntityType } from "../repositories/sync-tombstone-repository.j
 
 export type SyncReferenceEntity = "hosts" | "sshCredentials" | "vaultProfiles";
 
+interface TopologyNode {
+  data?: { id?: string; [key: string]: unknown };
+  [key: string]: unknown;
+}
+
+interface TopologyEdge {
+  data?: { source?: string; target?: string; [key: string]: unknown };
+  [key: string]: unknown;
+}
+
+interface Topology {
+  nodes?: TopologyNode[];
+  edges?: TopologyEdge[];
+  [key: string]: unknown;
+}
+
+/**
+ * Node/edge ids in a topology are either a host's local numeric `id` (as a
+ * string) or a client-generated `group-<timestamp>` id. Only the former is
+ * meaningful across sides, so translate just those through the mapper and
+ * leave group ids untouched. Nodes/edges that fail to resolve (host deleted,
+ * or not synced to this side yet) are dropped rather than left dangling.
+ */
+async function mapTopologyHostIds(
+  topologyJson: string | null | undefined,
+  mapId: (id: string) => Promise<string | null>,
+): Promise<string | null> {
+  if (!topologyJson) return topologyJson ?? null;
+
+  let topology: Topology;
+  try {
+    topology = JSON.parse(topologyJson);
+  } catch {
+    return topologyJson;
+  }
+
+  const isGroupId = (id: string) => id.startsWith("group-");
+  const idMap = new Map<string, string | null>();
+
+  const resolve = async (id: string): Promise<string | null> => {
+    if (isGroupId(id)) return id;
+    if (!idMap.has(id)) idMap.set(id, await mapId(id));
+    return idMap.get(id) ?? null;
+  };
+
+  const nodes: TopologyNode[] = [];
+  for (const node of topology.nodes ?? []) {
+    const id = node.data?.id;
+    if (typeof id !== "string") continue;
+    const mapped = await resolve(id);
+    if (mapped === null) continue;
+    nodes.push({ ...node, data: { ...node.data, id: mapped } });
+  }
+
+  const nodeIds = new Set(nodes.map((n) => n.data?.id));
+  const edges: TopologyEdge[] = [];
+  for (const edge of topology.edges ?? []) {
+    const source = edge.data?.source;
+    const target = edge.data?.target;
+    if (typeof source !== "string" || typeof target !== "string") continue;
+    const mappedSource = await resolve(source);
+    const mappedTarget = await resolve(target);
+    if (mappedSource === null || mappedTarget === null) continue;
+    if (!nodeIds.has(mappedSource) || !nodeIds.has(mappedTarget)) continue;
+    edges.push({
+      ...edge,
+      data: { ...edge.data, source: mappedSource, target: mappedTarget },
+    });
+  }
+
+  return JSON.stringify({ ...topology, nodes, edges });
+}
+
 interface SyncReference {
   field: string;
   syncField: string;
@@ -92,6 +165,19 @@ export async function serializeSyncReferences(
   ) => Promise<string | null>,
 ): Promise<Record<string, unknown>> {
   const serialized = { ...row };
+
+  if (entityType === "networkTopology") {
+    serialized.topology = await mapTopologyHostIds(
+      serialized.topology as string | null | undefined,
+      async (id) => {
+        const numericId = Number(id);
+        if (!Number.isInteger(numericId)) return null;
+        return resolveSyncId("hosts", numericId);
+      },
+    );
+    return serialized;
+  }
+
   for (const reference of REFERENCES[entityType] ?? []) {
     const id = serialized[reference.field];
     serialized[reference.syncField] =
@@ -112,6 +198,18 @@ export async function deserializeSyncReferences(
   ) => Promise<number | null>,
 ): Promise<Record<string, unknown>> {
   const deserialized = { ...row };
+
+  if (entityType === "networkTopology") {
+    deserialized.topology = await mapTopologyHostIds(
+      deserialized.topology as string | null | undefined,
+      async (syncId) => {
+        const id = await resolveId("hosts", syncId);
+        return id === null ? null : String(id);
+      },
+    );
+    return deserialized;
+  }
+
   for (const reference of REFERENCES[entityType] ?? []) {
     const syncId = deserialized[reference.syncField];
     delete deserialized[reference.syncField];
diff --git a/src/backend/database/routes/sync.ts b/src/backend/database/routes/sync.ts
index c3d4bcf19..509b323f8 100644
--- a/src/backend/database/routes/sync.ts
+++ b/src/backend/database/routes/sync.ts
@@ -10,6 +10,7 @@ import {
   dashboardServiceLinks,
   homepageItems,
   userPreferences,
+  networkTopology,
 } from "../db/schema.js";
 import { AuthManager } from "../../utils/auth-manager.js";
 import { DataCrypto } from "../../utils/data-crypto.js";
@@ -52,7 +53,8 @@ interface EntityConfig {
     | typeof vaultProfiles
     | typeof dashboardServiceLinks
     | typeof homepageItems
-    | typeof userPreferences;
+    | typeof userPreferences
+    | typeof networkTopology;
   // Fields that only make sense on the device that created the row, or
   // that are managed elsewhere and must never be overwritten by a sync
   // payload from the other side.
@@ -77,6 +79,11 @@ const ENTITY_CONFIG: Record<SyncEntityType, EntityConfig> = {
     readOnlyFields: ["storageMode"],
     singleton: true,
   },
+  networkTopology: {
+    table: networkTopology,
+    readOnlyFields: [],
+    singleton: true,
+  },
 };
 
 const VALID_ENTITY_TYPES = new Set(Object.keys(ENTITY_CONFIG));