diff --git a/src/main/ipc.ts b/src/main/ipc.ts
index 94f17c5..0eadd2f 100644
--- a/src/main/ipc.ts
+++ b/src/main/ipc.ts
@@ -572,12 +572,12 @@ export function setupIPC(
     return { success: true }
   })
 
-  // Export progress data (v1.2 includes review history for streak sync)
+  // Export progress data (v1.3 includes review history + star/block flags)
   ipcMain.handle('export-progress', () => {
     return buildExportData(db, app.getVersion())
   })
 
-  // Import progress data (supports v1.0–v1.2; reviewHistory optional)
+  // Import progress data (supports v1.0–v1.3; reviewHistory / problemFlags optional)
   ipcMain.handle('import-progress', (_event, data: ExportData) => {
     return importProgressData(db, data)
   })
@@ -693,7 +693,7 @@ export function setupIPC(
     return result.filePaths[0] || null
   })
 
-  // Perform auto-export to specified folder (v1.2 includes review history)
+  // Perform auto-export to specified folder (v1.3 includes review history + flags)
   ipcMain.handle('perform-auto-export', (_event, folderPath: string) => {
     return autoExport(folderPath)
   })
diff --git a/src/main/lib/sync-data.ts b/src/main/lib/sync-data.ts
index 414368d..f0a1387 100644
--- a/src/main/lib/sync-data.ts
+++ b/src/main/lib/sync-data.ts
@@ -24,15 +24,24 @@ export interface ExportReviewHistoryEntry {
   ease_factor_after: number | null
 }
 
+/** Star / block flags live on `problems`, not progress — synced separately. */
+export interface ExportProblemFlagsEntry {
+  neet_id: number
+  starred: number
+  blocked: number
+}
+
 export interface ExportData {
   version: string
   exportDate: string
   appVersion: string
   progress: ExportProgressEntry[]
   reviewHistory?: ExportReviewHistoryEntry[]
+  /** Present in v1.3+; starred/blocked problem flags */
+  problemFlags?: ExportProblemFlagsEntry[]
 }
 
-export const EXPORT_VERSION = '1.2'
+export const EXPORT_VERSION = '1.3'
 
 function reviewHistoryKey(entry: {
   neet_id: number
@@ -99,13 +108,30 @@ export function fetchReviewHistory(db: Database.Database): ExportReviewHistoryEn
     .all() as ExportReviewHistoryEntry[]
 }
 
+export function fetchProblemFlags(db: Database.Database): ExportProblemFlagsEntry[] {
+  return db
+    .prepare(
+      `
+      SELECT
+        neet_id,
+        COALESCE(starred, 0) as starred,
+        COALESCE(blocked, 0) as blocked
+      FROM problems
+      WHERE COALESCE(starred, 0) = 1 OR COALESCE(blocked, 0) = 1
+      ORDER BY neet_id
+    `
+    )
+    .all() as ExportProblemFlagsEntry[]
+}
+
 export function buildExportData(db: Database.Database, appVersion: string): ExportData {
   return {
     version: EXPORT_VERSION,
     exportDate: new Date().toISOString(),
     appVersion,
     progress: fetchProgress(db),
-    reviewHistory: fetchReviewHistory(db)
+    reviewHistory: fetchReviewHistory(db),
+    problemFlags: fetchProblemFlags(db)
   }
 }
 
@@ -237,6 +263,21 @@ export function importProgressData(
     }
 
     historyImported = mergeReviewHistory(db, data.reviewHistory)
+
+    // v1.3+: replace local star/block flags from the backup when the field is present.
+    // Older backups omit problemFlags — leave local flags untouched.
+    if (Array.isArray(data.problemFlags)) {
+      db.prepare('UPDATE problems SET starred = 0, blocked = 0').run()
+      const updateFlags = db.prepare(
+        'UPDATE problems SET starred = ?, blocked = ? WHERE neet_id = ?'
+      )
+      for (const entry of data.problemFlags) {
+        if (typeof entry?.neet_id !== 'number') continue
+        const starred = entry.starred ? 1 : 0
+        const blocked = entry.blocked ? 1 : 0
+        updateFlags.run(starred, blocked, entry.neet_id)
+      }
+    }
   })
 
   transaction()
diff --git a/src/preload/index.d.ts b/src/preload/index.d.ts
index d5e6778..32e4382 100644
--- a/src/preload/index.d.ts
+++ b/src/preload/index.d.ts
@@ -98,6 +98,12 @@ export interface ExportReviewHistoryEntry {
   ease_factor_after: number | null
 }
 
+export interface ExportProblemFlagsEntry {
+  neet_id: number
+  starred: number
+  blocked: number
+}
+
 export interface ExportData {
   version: string
   exportDate: string
@@ -105,6 +111,8 @@ export interface ExportData {
   progress: ExportProgressEntry[]
   // Present in v1.2+; used for activity heatmap / streak sync
   reviewHistory?: ExportReviewHistoryEntry[]
+  // Present in v1.3+; starred / blocked flags
+  problemFlags?: ExportProblemFlagsEntry[]
 }
 
 export interface API {
diff --git a/src/renderer/src/stores/problems.ts b/src/renderer/src/stores/problems.ts
index f1238a1..5218eae 100644
--- a/src/renderer/src/stores/problems.ts
+++ b/src/renderer/src/stores/problems.ts
@@ -252,6 +252,19 @@ export async function selectProblem(problem: Problem): Promise<void> {
   selectedProblem.set(problem)
 }
 
+
+async function maybeAutoExport(reason: string): Promise<void> {
+  try {
+    const syncPrefs = await window.api.getAutoSyncPreferences()
+    if (syncPrefs.enabled && syncPrefs.folderPath) {
+      await window.api.performAutoExport(syncPrefs.folderPath)
+    }
+  } catch (syncError) {
+    // Don't fail the user action if sync fails
+    console.error(`Auto-sync after ${reason} failed:`, syncError)
+  }
+}
+
 export async function submitReview(
   problemId: number,
   quality: number
@@ -259,17 +272,8 @@ export async function submitReview(
   try {
     const result = await window.api.submitReview({ problemId, quality })
 
-    // Trigger auto-export if enabled
     if (result.success) {
-      try {
-        const syncPrefs = await window.api.getAutoSyncPreferences()
-        if (syncPrefs.enabled && syncPrefs.folderPath) {
-          await window.api.performAutoExport(syncPrefs.folderPath)
-        }
-      } catch (syncError) {
-        // Don't fail the review if sync fails
-        console.error('Auto-sync after review failed:', syncError)
-      }
+      await maybeAutoExport('review')
     }
 
     return result
@@ -293,6 +297,7 @@ export async function setProblemBlocked(problemId: number, blocked: boolean): Pr
   try {
     await window.api.setProblemBlocked(problemId, blocked)
     await Promise.all([loadProblems(), loadTodayReviews()])
+    await maybeAutoExport('block')
   } catch (error) {
     console.error('Failed to set problem blocked:', error)
   }
@@ -302,6 +307,7 @@ export async function setProblemStarred(problemId: number, starred: boolean): Pr
   try {
     await window.api.setProblemStarred(problemId, starred)
     await loadProblems()
+    await maybeAutoExport('star')
   } catch (error) {
     console.error('Failed to set problem starred:', error)
   }