diff --git a/.env b/.env
index 9985bd8..ee45e88 100644
--- a/.env
+++ b/.env
@@ -11,9 +11,9 @@ REACT_APP_OPTIONSPAGE_DEV=http://localhost:3000/options.html
 
 REACT_APP_LOGOURL=https://fishjar.github.io/kiss-translator/images/logo192.png
 
-REACT_APP_RULESURL=https://fishjar.github.io/kiss-rules/kiss-rules.json
-REACT_APP_RULESURL_ON=https://fishjar.github.io/kiss-rules/kiss-rules-on.json
-REACT_APP_RULESURL_OFF=https://fishjar.github.io/kiss-rules/kiss-rules-off.json
+REACT_APP_RULESURL=https://fishjar.github.io/kiss-rules/kiss-rules_v2.json
+REACT_APP_RULESURL_ON=https://fishjar.github.io/kiss-rules/kiss-rules-on_v2.json
+REACT_APP_RULESURL_OFF=https://fishjar.github.io/kiss-rules/kiss-rules-off_v2.json
 
 REACT_APP_USERSCRIPT_DOWNLOADURL=https://fishjar.github.io/kiss-translator/kiss-translator.user.js
 REACT_APP_USERSCRIPT_IOS_DOWNLOADURL=https://fishjar.github.io/kiss-translator/kiss-translator-ios-safari.user.js
diff --git a/src/config/app.js b/src/config/app.js
index 234322e..2c8d4ee 100644
--- a/src/config/app.js
+++ b/src/config/app.js
@@ -7,5 +7,7 @@ export const APP_CONSTS = {
   boxID: `${APP_LCNAME}-box`,
 };
 
+export const APP_VERSION = process.env.REACT_APP_VERSION.split(".");
+
 export const THEME_LIGHT = "light";
 export const THEME_DARK = "dark";
diff --git a/src/config/i18n.js b/src/config/i18n.js
index 74284b5..4a18f45 100644
--- a/src/config/i18n.js
+++ b/src/config/i18n.js
@@ -1402,4 +1402,9 @@ export const I18N = {
     en: `Whether to pre-initialize`,
     zh_TW: `是否預初始化`,
   },
+  export_old: {
+    zh: `导出旧版`,
+    en: `Export old version`,
+    zh_TW: `匯出舊版`,
+  },
 };
diff --git a/src/config/storage.js b/src/config/storage.js
index 59423d1..b5e5227 100644
--- a/src/config/storage.js
+++ b/src/config/storage.js
@@ -1,16 +1,18 @@
-import { APP_NAME } from "./app";
+import { APP_NAME, APP_VERSION } from "./app";
 
-export const KV_RULES_KEY = "kiss-rules.json";
+export const KV_RULES_KEY = `kiss-rules_v${APP_VERSION[0]}.json`;
 export const KV_WORDS_KEY = "kiss-words.json";
-export const KV_RULES_SHARE_KEY = "kiss-rules-share.json";
-export const KV_SETTING_KEY = "kiss-setting.json";
+export const KV_RULES_SHARE_KEY = `kiss-rules-share_v${APP_VERSION[0]}.json`;
+export const KV_SETTING_KEY = `kiss-setting_v${APP_VERSION[0]}.json`;
 export const KV_SALT_SYNC = "KISS-Translator-SYNC";
 export const KV_SALT_SHARE = "KISS-Translator-SHARE";
 
 export const STOKEY_MSAUTH = `${APP_NAME}_msauth`;
 export const STOKEY_BDAUTH = `${APP_NAME}_bdauth`;
-export const STOKEY_SETTING = `${APP_NAME}_setting`;
-export const STOKEY_RULES = `${APP_NAME}_rules`;
+export const STOKEY_SETTING_OLD = `${APP_NAME}_setting`;
+export const STOKEY_RULES_OLD = `${APP_NAME}_rules`;
+export const STOKEY_SETTING = `${APP_NAME}_setting_v${APP_VERSION[0]}`;
+export const STOKEY_RULES = `${APP_NAME}_rules_v${APP_VERSION[0]}`;
 export const STOKEY_WORDS = `${APP_NAME}_words`;
 export const STOKEY_SYNC = `${APP_NAME}_sync`;
 export const STOKEY_FAB = `${APP_NAME}_fab`;
diff --git a/src/hooks/Alert.js b/src/hooks/Alert.js
index 12e0684..817dd54 100644
--- a/src/hooks/Alert.js
+++ b/src/hooks/Alert.js
@@ -1,4 +1,11 @@
-import { createContext, useContext, useState, forwardRef } from "react";
+import {
+  createContext,
+  useContext,
+  useState,
+  forwardRef,
+  useCallback,
+  useMemo,
+} from "react";
 import Snackbar from "@mui/material/Snackbar";
 import MuiAlert from "@mui/material/Alert";
 
@@ -18,32 +25,37 @@ export function AlertProvider({ children }) {
   const horizontal = "center";
   const [open, setOpen] = useState(false);
   const [severity, setSeverity] = useState("info");
-  const [message, setMessage] = useState("");
+  const [message, setMessage] = useState(null);
 
-  const showAlert = (msg, type) => {
+  const showAlert = useCallback((msg, type) => {
     setOpen(true);
     setMessage(msg);
     setSeverity(type);
-  };
+  }, []);
 
-  const handleClose = (_, reason) => {
+  const handleClose = useCallback((_, reason) => {
     if (reason === "clickaway") {
       return;
     }
     setOpen(false);
-  };
+  }, []);
 
-  const error = (msg) => showAlert(msg, "error");
-  const warning = (msg) => showAlert(msg, "warning");
-  const info = (msg) => showAlert(msg, "info");
-  const success = (msg) => showAlert(msg, "success");
+  const value = useMemo(
+    () => ({
+      error: (msg) => showAlert(msg, "error"),
+      warning: (msg) => showAlert(msg, "warning"),
+      info: (msg) => showAlert(msg, "info"),
+      success: (msg) => showAlert(msg, "success"),
+    }),
+    [showAlert]
+  );
 
   return (
-    <AlertContext.Provider value={{ error, warning, info, success }}>
+    <AlertContext.Provider value={value}>
       {children}
       <Snackbar
         open={open}
-        autoHideDuration={3000}
+        autoHideDuration={10000}
         onClose={handleClose}
         anchorOrigin={{ vertical, horizontal }}
       >
diff --git a/src/libs/storage.js b/src/libs/storage.js
index 9aefd7d..9db06fe 100644
--- a/src/libs/storage.js
+++ b/src/libs/storage.js
@@ -1,6 +1,8 @@
 import {
   STOKEY_SETTING,
+  STOKEY_SETTING_OLD,
   STOKEY_RULES,
+  STOKEY_RULES_OLD,
   STOKEY_WORDS,
   STOKEY_FAB,
   STOKEY_SYNC,
@@ -60,7 +62,12 @@ async function trySetObj(key, obj) {
 
 async function getObj(key) {
   const val = await get(key);
-  return val && JSON.parse(val);
+  try {
+    return JSON.parse(val);
+  } catch (err) {
+    kissLog("parse json: ", key);
+  }
+  return null;
 }
 
 async function putObj(key, obj) {
@@ -86,6 +93,7 @@ export const storage = {
  * 设置信息
  */
 export const getSetting = () => getObj(STOKEY_SETTING);
+export const getSettingOld = () => getObj(STOKEY_SETTING_OLD);
 export const getSettingWithDefault = async () => ({
   ...DEFAULT_SETTING,
   ...((await getSetting()) || {}),
@@ -97,6 +105,7 @@ export const putSetting = (obj) => putObj(STOKEY_SETTING, obj);
  * 规则列表
  */
 export const getRules = () => getObj(STOKEY_RULES);
+export const getRulesOld = () => getObj(STOKEY_RULES_OLD);
 export const getRulesWithDefault = async () =>
   (await getRules()) || DEFAULT_RULES;
 export const setRules = (val) => setObj(STOKEY_RULES, val);
diff --git a/src/views/Options/Rules.js b/src/views/Options/Rules.js
index ae5936b..58c839a 100644
--- a/src/views/Options/Rules.js
+++ b/src/views/Options/Rules.js
@@ -45,7 +45,11 @@ import { loadOrFetchSubRules } from "../../libs/subRules";
 import { useAlert } from "../../hooks/Alert";
 import { syncShareRules } from "../../libs/sync";
 import { debounce } from "../../libs/utils";
-import { delSubRules, getSyncWithDefault } from "../../libs/storage";
+import {
+  delSubRules,
+  getSyncWithDefault,
+  getRulesOld,
+} from "../../libs/storage";
 import OwSubRule from "./OwSubRule";
 import ClearAllIcon from "@mui/icons-material/ClearAll";
 import HelpButton from "./HelpButton";
@@ -901,6 +905,11 @@ function UserRules({ subRules, rules }) {
           text={i18n("export")}
           fileName={`kiss-rules_${Date.now()}.json`}
         />
+        <DownloadButton
+          handleData={async () => JSON.stringify(await getRulesOld(), null, 2)}
+          text={i18n("export_old")}
+          fileName={`kiss-rules_v1_${Date.now()}.json`}
+        />
 
         <ShareButton
           rules={rules}
@@ -979,6 +988,7 @@ function SubRulesItem({
   deleteDataCache,
 }) {
   const [loading, setLoading] = useState(false);
+  const alert = useAlert();
 
   const handleDel = async () => {
     try {
@@ -1000,6 +1010,12 @@ function SubRulesItem({
       await updateDataCache(url);
     } catch (err) {
       kissLog("sync sub rules", err);
+      alert.error(
+        <>
+          <p>Sync Error:</p>
+          <pre>{err.message}</pre>
+        </>
+      );
     } finally {
       setLoading(false);
     }
diff --git a/src/views/Options/Setting.js b/src/views/Options/Setting.js
index 7ff4892..82e0382 100644
--- a/src/views/Options/Setting.js
+++ b/src/views/Options/Setting.js
@@ -32,6 +32,7 @@ import { sendBgMsg } from "../../libs/msg";
 import { kissLog } from "../../libs/log";
 import UploadButton from "./UploadButton";
 import DownloadButton from "./DownloadButton";
+import { getSettingOld } from "../../libs/storage";
 
 function ShortcutItem({ action, label }) {
   const { shortcut, setShortcut } = useShortcut(action);
@@ -137,6 +138,13 @@ export default function Settings() {
             text={i18n("export")}
             fileName={`kiss-setting_${Date.now()}.json`}
           />
+          <DownloadButton
+            handleData={async () =>
+              JSON.stringify(await getSettingOld(), null, 2)
+            }
+            text={i18n("export_old")}
+            fileName={`kiss-setting_v1_${Date.now()}.json`}
+          />
         </Stack>
 
         <Box>
diff --git a/src/views/Options/SyncSetting.js b/src/views/Options/SyncSetting.js
index ef23103..65980d0 100644
--- a/src/views/Options/SyncSetting.js
+++ b/src/views/Options/SyncSetting.js
@@ -189,7 +189,7 @@ export default function SyncSetting() {
           </LoadingButton>
           <Button
             size="small"
-            variant="contained"
+            variant="outlined"
             onClick={handleGenerateShareString}
             startIcon={<ContentCopyIcon />}
           >
@@ -198,7 +198,7 @@ export default function SyncSetting() {
           <Button
             onClick={handleImportFromClipboard}
             size="small"
-            variant="contained"
+            variant="outlined"
             startIcon={<ContentPasteIcon />}
           >
             {i18n("import", "import")}