diff --git a/lib/ops/create-replace-thread-operation.js b/lib/ops/create-replace-thread-operation.js
--- a/lib/ops/create-replace-thread-operation.js
+++ b/lib/ops/create-replace-thread-operation.js
@@ -17,4 +17,5 @@
     },
   };
 }
+
 export { createReplaceThreadOperation };
diff --git a/lib/ops/thread-activity-store-ops.js b/lib/ops/thread-activity-store-ops.js
--- a/lib/ops/thread-activity-store-ops.js
+++ b/lib/ops/thread-activity-store-ops.js
@@ -1,10 +1,12 @@
 // @flow
 
 import { type BaseStoreOpsHandlers } from './base-ops.js';
+import { threadSpecs } from '../shared/threads/thread-specs.js';
 import type {
   ThreadActivityStore,
   ThreadActivityStoreEntry,
 } from '../types/thread-activity-types.js';
+import type { RawThreadInfos } from '../types/thread-types.js';
 
 // client types
 export type ReplaceThreadActivityEntryOperation = {
@@ -12,6 +14,7 @@
   +payload: {
     +id: string,
     +threadActivityStoreEntry: ThreadActivityStoreEntry,
+    +isBackedUp: boolean,
   },
 };
 
@@ -133,7 +136,30 @@
   },
 };
 
+function createReplaceThreadActivityEntryOperation(
+  id: string,
+  threadActivityStoreEntry: ThreadActivityStoreEntry,
+  threadInfos: RawThreadInfos,
+): ReplaceThreadActivityEntryOperation {
+  const threadInfo = threadInfos[id];
+  if (!threadInfo) {
+    return {
+      type: 'replace_thread_activity_entry',
+      payload: { id, threadActivityStoreEntry, isBackedUp: true },
+    };
+  }
+  return {
+    type: 'replace_thread_activity_entry',
+    payload: {
+      id,
+      threadActivityStoreEntry,
+      isBackedUp: threadSpecs[threadInfo.type].protocol.dataIsBackedUp,
+    },
+  };
+}
+
 export {
   threadActivityStoreOpsHandlers,
   convertThreadActivityEntryToClientDBThreadActivityEntry,
+  createReplaceThreadActivityEntryOperation,
 };
diff --git a/lib/reducers/master-reducer.js b/lib/reducers/master-reducer.js
--- a/lib/reducers/master-reducer.js
+++ b/lib/reducers/master-reducer.js
@@ -192,6 +192,7 @@
     reduceThreadActivity(
       state.threadActivityStore,
       action,
+      threadInfos,
       onStateDifferenceForStaff,
     );
 
diff --git a/lib/reducers/thread-activity-reducer.js b/lib/reducers/thread-activity-reducer.js
--- a/lib/reducers/thread-activity-reducer.js
+++ b/lib/reducers/thread-activity-reducer.js
@@ -22,6 +22,7 @@
 import {
   threadActivityStoreOpsHandlers,
   type ThreadActivityStoreOperation,
+  createReplaceThreadActivityEntryOperation,
 } from '../ops/thread-activity-store-ops.js';
 import { isWebPlatform } from '../types/device-types.js';
 import { processDMOpsActionType } from '../types/dm-ops.js';
@@ -32,6 +33,7 @@
 } from '../types/socket-types.js';
 import type { ThreadActivityStore } from '../types/thread-activity-types.js';
 import { updateThreadLastNavigatedActionType } from '../types/thread-activity-types.js';
+import type { RawThreadInfos } from '../types/thread-types.js';
 import { updateTypes } from '../types/update-types-enum.js';
 import type { ClientUpdateInfo } from '../types/update-types.js';
 import { processUpdatesActionType } from '../types/update-types.js';
@@ -116,20 +118,19 @@
 function reduceThreadActivity(
   state: ThreadActivityStore,
   action: BaseAction,
+  threadInfos: RawThreadInfos,
   onStateDifference?: (message: string) => mixed,
 ): ReduceThreadActivityResult {
   if (action.type === updateThreadLastNavigatedActionType) {
     const { threadID, time } = action.payload;
-    const replaceOperation = {
-      type: 'replace_thread_activity_entry',
-      payload: {
-        id: threadID,
-        threadActivityStoreEntry: {
-          ...state[threadID],
-          lastNavigatedTo: time,
-        },
+    const replaceOperation = createReplaceThreadActivityEntryOperation(
+      threadID,
+      {
+        ...state[threadID],
+        lastNavigatedTo: time,
       },
-    };
+      threadInfos,
+    );
     return {
       threadActivityStore: processStoreOps(state, [replaceOperation]),
       threadActivityStoreOperations: [replaceOperation],
@@ -138,16 +139,14 @@
     const now = Date.now();
     const replaceOperations = [];
     for (const threadID: string of action.payload.threadIDs) {
-      const replaceOperation = {
-        type: 'replace_thread_activity_entry',
-        payload: {
-          id: threadID,
-          threadActivityStoreEntry: {
-            ...state[threadID],
-            lastPruned: now,
-          },
+      const replaceOperation = createReplaceThreadActivityEntryOperation(
+        threadID,
+        {
+          ...state[threadID],
+          lastPruned: now,
         },
-      };
+        threadInfos,
+      );
       replaceOperations.push(replaceOperation);
     }
     return {
diff --git a/lib/reducers/thread-activity-reducer.test.js b/lib/reducers/thread-activity-reducer.test.js
--- a/lib/reducers/thread-activity-reducer.test.js
+++ b/lib/reducers/thread-activity-reducer.test.js
@@ -36,7 +36,7 @@
         lastPruned: 1639522314170,
       },
     };
-    const result = reduceThreadActivity(initialState, action);
+    const result = reduceThreadActivity(initialState, action, {});
     expect(result.threadActivityStore).toEqual(expectedState);
   });
 
@@ -54,7 +54,7 @@
         lastNavigatedTo: 1639522317443,
       },
     };
-    const result = reduceThreadActivity(initialState, action);
+    const result = reduceThreadActivity(initialState, action, {});
     expect(result.threadActivityStore).toEqual(expectedState);
   });
 
@@ -71,7 +71,7 @@
         lastPruned: expect.any(Number),
       },
     };
-    const result = reduceThreadActivity(initialState, action);
+    const result = reduceThreadActivity(initialState, action, {});
     expect(result.threadActivityStore).toEqual(expectedState);
   });
 
@@ -100,7 +100,7 @@
         lastPruned: 1639522314170,
       },
     };
-    const result = reduceThreadActivity(initialState, action);
+    const result = reduceThreadActivity(initialState, action, {});
     expect(result.threadActivityStore).toEqual(expectedState);
   });
 
@@ -142,8 +142,8 @@
       },
     };
 
-    expect(reduceThreadActivity(threads, action).threadActivityStore).toEqual(
-      threads3,
-    );
+    expect(
+      reduceThreadActivity(threads, action, {}).threadActivityStore,
+    ).toEqual(threads3);
   });
 });
diff --git a/native/redux/persist.js b/native/redux/persist.js
--- a/native/redux/persist.js
+++ b/native/redux/persist.js
@@ -1285,6 +1285,11 @@
         payload: {
           id: threadID,
           threadActivityStoreEntry: entry,
+          // Adding `isBackedUp` only to support types, when this migration was
+          // implemented, backup was not yet supported, because of that,
+          // this migration should maintain the default behaviour.
+          // Migrating DM threads to be supported by backup is added later.
+          isBackedUp: false,
         },
       }));
 
diff --git a/web/redux/redux-setup.js b/web/redux/redux-setup.js
--- a/web/redux/redux-setup.js
+++ b/web/redux/redux-setup.js
@@ -17,6 +17,7 @@
   keyserverStoreOpsHandlers,
 } from 'lib/ops/keyserver-store-ops.js';
 import {
+  createReplaceThreadActivityEntryOperation,
   type ReplaceThreadActivityEntryOperation,
   threadActivityStoreOpsHandlers,
 } from 'lib/ops/thread-activity-store-ops.js';
@@ -496,16 +497,15 @@
     state.messageStore.threads[activeThread]
   ) {
     const now = Date.now();
-    const replaceOperation: ReplaceThreadActivityEntryOperation = {
-      type: 'replace_thread_activity_entry',
-      payload: {
-        id: activeThread,
-        threadActivityStoreEntry: {
+    const replaceOperation: ReplaceThreadActivityEntryOperation =
+      createReplaceThreadActivityEntryOperation(
+        activeThread,
+        {
           ...state[activeThread],
           lastNavigatedTo: now,
         },
-      },
-    };
+        state.threadStore.threadInfos,
+      );
 
     const threadActivityStore =
       threadActivityStoreOpsHandlers.processStoreOperations(