diff --git a/lib/tunnelbroker/use-peer-to-peer-message-handler.js b/lib/tunnelbroker/use-peer-to-peer-message-handler.js
--- a/lib/tunnelbroker/use-peer-to-peer-message-handler.js
+++ b/lib/tunnelbroker/use-peer-to-peer-message-handler.js
@@ -10,6 +10,7 @@
 import { removePeerUsersActionType } from '../actions/aux-user-actions.js';
 import { invalidateTunnelbrokerDeviceTokenActionType } from '../actions/tunnelbroker-actions.js';
 import { logOutActionTypes, useBaseLogOut } from '../actions/user-actions.js';
+import { useUserDataRestore } from '../backup/use-user-data-restore.js';
 import {
   logTypes,
   type OlmDebugLog,
@@ -58,6 +59,7 @@
 import { getClientMessageIDFromTunnelbrokerMessageID } from '../utils/peer-to-peer-communication-utils.js';
 import { useDispatchActionPromise } from '../utils/redux-promise-utils.js';
 import { useDispatch, useSelector } from '../utils/redux-utils.js';
+import { fullBackupSupport } from '../utils/services-utils.js';
 
 // When logout is requested by primary device, logging out of Identity Service
 // is already handled by the primary device
@@ -94,6 +96,9 @@
   const runDeviceListUpdate = useDeviceListUpdate();
 
   const processDMOperation = useProcessDMOperation();
+  const userDataRestore = useUserDataRestore();
+  const restoreBackupState = useSelector(state => state.restoreBackupState);
+  const username = useSelector(state => state.currentUserInfo?.username);
 
   return React.useCallback(
     async (
@@ -170,6 +175,44 @@
           });
           await sqliteAPI.removeInboundP2PMessages([messageID]);
         }
+      } else if (
+        userActionMessage.type === userActionsP2PMessageTypes.BACKUP_DATA
+      ) {
+        if (!fullBackupSupport) {
+          console.warn(
+            'Received backup data but this device is not supporting UserData backup',
+          );
+          return;
+        }
+
+        if (restoreBackupState.status !== 'no_backup') {
+          console.warn(
+            'Received backup data but backup action was already dispatched',
+          );
+          await sqliteAPI.removeInboundP2PMessages([messageID]);
+          return;
+        }
+
+        const { userID, backupData } = userActionMessage;
+        const { userID: currentUserID, accessToken } = await getAuthMetadata();
+
+        if (userID !== currentUserID) {
+          console.warn('Received backup data from wrong user');
+          await sqliteAPI.removeInboundP2PMessages([messageID]);
+          return;
+        }
+
+        if (!username || !accessToken) {
+          return;
+        }
+
+        await userDataRestore(backupData, {
+          userID,
+          accessToken,
+          username,
+        });
+
+        await sqliteAPI.removeInboundP2PMessages([messageID]);
       } else {
         console.warn(
           'Unsupported P2P user action message:',
@@ -184,7 +227,10 @@
       primaryDeviceRequestedLogOut,
       processDMOperation,
       reBroadcastAccountDeletion,
+      restoreBackupState.status,
       runDeviceListUpdate,
+      userDataRestore,
+      username,
     ],
   );
 }