diff --git a/CHANGELOG.md b/CHANGELOG.md
index 57a4b2920..225e2fbae 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,7 @@
 ## 12.x.x (unreleased)
 
 ### Improvements
+- Client: Preferences Registry
 
 ### Bugfixes
 - 
diff --git a/locales/ja-JP.yml b/locales/ja-JP.yml
index 0c4a7c723..03c1fac68 100644
--- a/locales/ja-JP.yml
+++ b/locales/ja-JP.yml
@@ -561,6 +561,7 @@ author: "作者"
 leaveConfirm: "未保存の変更があります。破棄しますか？"
 manage: "管理"
 plugins: "プラグイン"
+preferencesBackups: "設定のバックアップ"
 deck: "デッキ"
 undeck: "デッキ解除"
 useBlurEffectForModal: "モーダルにぼかし効果を使用"
@@ -952,6 +953,25 @@ _plugin:
   installWarn: "信頼できないプラグインはインストールしないでください。"
   manage: "プラグインの管理"
 
+_preferencesBackups:
+  list: "作成したバックアップ"
+  saveNew: "新規保存"
+  loadFile: "ファイルを読み込み"
+  apply: "このデバイスに適用"
+  save: "上書き保存"
+  inputName: "バックアップ名を入力"
+  cannotSave: "保存できません"
+  nameAlreadyExists: "バックアップ名「{name}」は既に存在します。違う名前を指定してください。"
+  applyConfirm: "バックアップ「{name}」を現在のデバイスに適用しますか？現在のデバイス設定は失われます。"
+  saveConfirm: "{name}に上書き保存しますか？"
+  deleteConfirm: "{name}を削除しますか？"
+  renameConfirm: "「{old}」を「{new}」に変更しますか？"
+  noBackups: "バックアップはありません。「新規保存」で現在のクライアント設定をサーバーに保存できます。"
+  createdAt: "作成日時: {date} {time}"
+  updatedAt: "更新日時: {date} {time}"
+  cannotLoad: "読み込みできません"
+  invalidFile: "ファイル形式が違います。"
+
 _registry:
   scope: "スコープ"
   key: "キー"
diff --git a/packages/client/src/pages/settings/index.vue b/packages/client/src/pages/settings/index.vue
index 0ca91d0eb..862435eb3 100644
--- a/packages/client/src/pages/settings/index.vue
+++ b/packages/client/src/pages/settings/index.vue
@@ -171,6 +171,11 @@ const menuDef = computed(() => [{
 	}],
 }, {
 	items: [{
+		icon: 'fas fa-floppy-disk',
+		text: i18n.ts.preferencesBackups,
+		to: '/settings/preferences-backups',
+		active: currentPage?.route.name === 'preferences-backups',
+	}, {
 		type: 'button',
 		icon: 'fas fa-trash',
 		text: i18n.ts.clearCache,
diff --git a/packages/client/src/pages/settings/preferences-backups.vue b/packages/client/src/pages/settings/preferences-backups.vue
new file mode 100644
index 000000000..3653e2dc1
--- /dev/null
+++ b/packages/client/src/pages/settings/preferences-backups.vue
@@ -0,0 +1,444 @@
+<template>
+<div class="_formRoot">
+	<div :class="$style.buttons">
+		<MkButton inline primary @click="saveNew">{{ ts._preferencesBackups.saveNew }}</MkButton>
+		<MkButton inline @click="loadFile">{{ ts._preferencesBackups.loadFile }}</MkButton>
+	</div>
+
+	<FormSection>
+		<template #label>{{ ts._preferencesBackups.list }}</template>
+		<template v-if="profiles && Object.keys(profiles).length > 0">
+			<div
+				v-for="(profile, id) in profiles"
+				:key="id"
+				class="_formBlock _panel"
+				:class="$style.profile"
+				@click="$event => menu($event, id)"
+				@contextmenu.prevent.stop="$event => menu($event, id)"
+			>
+				<div :class="$style.profileName">{{ profile.name }}</div>
+				<div :class="$style.profileTime">{{ t('_preferencesBackups.createdAt', { date: (new Date(profile.createdAt)).toLocaleDateString(), time: (new Date(profile.createdAt)).toLocaleTimeString() }) }}</div>
+				<div v-if="profile.updatedAt" :class="$style.profileTime">{{ t('_preferencesBackups.updatedAt', { date: (new Date(profile.updatedAt)).toLocaleDateString(), time: (new Date(profile.updatedAt)).toLocaleTimeString() }) }}</div>
+			</div>
+		</template>
+		<div v-else-if="profiles">
+			<MkInfo>{{ ts._preferencesBackups.noBackups }}</MkInfo>
+		</div>
+		<MkLoading v-else/>
+	</FormSection>
+</div>
+</template>
+
+<script lang="ts" setup>
+import { computed, onMounted, onUnmounted, useCssModule } from 'vue';
+import { v4 as uuid } from 'uuid';
+import FormSection from '@/components/form/section.vue';
+import MkButton from '@/components/ui/button.vue';
+import MkInfo from '@/components/ui/info.vue';
+import * as os from '@/os';
+import { ColdDeviceStorage, defaultStore } from '@/store';
+import { unisonReload } from '@/scripts/unison-reload';
+import { stream } from '@/stream';
+import { $i } from '@/account';
+import { i18n } from '@/i18n';
+import { version, host } from '@/config';
+import { definePageMetadata } from '@/scripts/page-metadata';
+const { t, ts } = i18n;
+
+useCssModule();
+
+const defaultStoreSaveKeys: (keyof typeof defaultStore['state'])[] = [
+	'menu',
+	'visibility',
+	'localOnly',
+	'statusbars',
+	'widgets',
+	'tl',
+	'overridedDeviceKind',
+	'serverDisconnectedBehavior',
+	'nsfw',
+	'animation',
+	'animatedMfm',
+	'loadRawImages',
+	'imageNewTab',
+	'disableShowingAnimatedImages',
+	'disablePagesScript',
+	'useOsNativeEmojis',
+	'disableDrawer',
+	'useBlurEffectForModal',
+	'useBlurEffect',
+	'showFixedPostForm',
+	'enableInfiniteScroll',
+	'useReactionPickerForContextMenu',
+	'showGapBetweenNotesInTimeline',
+	'instanceTicker',
+	'reactionPickerSize',
+	'reactionPickerWidth',
+	'reactionPickerHeight',
+	'reactionPickerUseDrawerForMobile',
+	'defaultSideView',
+	'menuDisplay',
+	'reportError',
+	'squareAvatars',
+	'numberOfPageCache',
+	'aiChanMode',
+];
+const coldDeviceStorageSaveKeys: (keyof typeof ColdDeviceStorage.default)[] = [
+	'lightTheme',
+	'darkTheme',
+	'syncDeviceDarkMode',
+	'plugins',
+	'mediaVolume',
+	'sound_masterVolume',
+	'sound_note',
+	'sound_noteMy',
+	'sound_notification',
+	'sound_chat',
+	'sound_chatBg',
+	'sound_antenna',
+	'sound_channel',
+];
+
+const scope = ['clientPreferencesProfiles'];
+
+const profileProps = ['name', 'createdAt', 'updatedAt', 'misskeyVersion', 'settings'];
+
+type Profile = {
+	name: string;
+	createdAt: string;
+	updatedAt: string | null;
+	misskeyVersion: string;
+	host: string;
+	settings: {
+		hot: Record<keyof typeof defaultStoreSaveKeys, unknown>;
+		cold: Record<keyof typeof coldDeviceStorageSaveKeys, unknown>;
+		fontSize: string | null;
+		useSystemFont: 't' | null;
+		wallpaper: string | null;
+	};
+};
+
+const connection = $i && stream.useChannel('main');
+
+let profiles = $ref<Record<string, Profile> | null>(null);
+
+os.api('i/registry/get-all', { scope })
+	.then(res => {
+		profiles = res || {};
+	});
+
+function isObject(value: unknown): value is Record<string, unknown> {
+	return value != null && typeof value === 'object' && !Array.isArray(value);
+}
+
+function validate(profile: unknown): void {
+	if (!isObject(profile)) throw Error('not an object');
+
+	// Check if unnecessary properties exist
+	if (Object.keys(profile).some(key => !profileProps.includes(key))) throw Error('Unnecessary properties exist');
+
+	if (!profile.name) throw Error('Missing required prop: name');
+	if (!profile.misskeyVersion) throw Error('Missing required prop: misskeyVersion');
+	
+	// Check if createdAt and updatedAt is Date
+	// https://zenn.dev/lollipop_onl/articles/eoz-judge-js-invalid-date
+	if (!profile.createdAt || Number.isNaN(new Date(profile.createdAt).getTime())) throw Error('createdAt is falsy or not Date');
+	if (profile.updatedAt) {
+		if (Number.isNaN(new Date(profile.updatedAt).getTime())) {
+			throw Error('updatedAt is not Date');
+		}
+	} else if (profile.updatedAt !== null) {
+		throw Error('updatedAt is not null');
+	}
+
+	if (!profile.settings) throw Error('Missing required prop: settings');
+	if (!isObject(profile.settings)) throw Error('Invalid prop: settings');
+}
+
+function getSettings(): Profile['settings'] {
+	const hot = {} as Record<keyof typeof defaultStoreSaveKeys, unknown>;
+	for (const key of defaultStoreSaveKeys) {
+		hot[key] = defaultStore.state[key];
+	}
+
+	const cold = {} as Record<keyof typeof coldDeviceStorageSaveKeys, unknown>;
+	for (const key of coldDeviceStorageSaveKeys) {
+		cold[key] = ColdDeviceStorage.get(key);
+	}
+
+	return {
+		hot,
+		cold,
+		fontSize: localStorage.getItem('fontSize'),
+		useSystemFont: localStorage.getItem('useSystemFont') as 't' | null,
+		wallpaper: localStorage.getItem('wallpaper'),
+	};
+}
+
+async function saveNew(): Promise<void> {
+	if (!profiles) return;
+
+	const { canceled, result: name } = await os.inputText({
+		title: ts._preferencesBackups.inputName,
+	});
+	if (canceled) return;
+
+	if (Object.values(profiles).some(x => x.name === name)) {
+		return os.alert({
+			title: ts._preferencesBackups.cannotSave,
+			text: t('_preferencesBackups.nameAlreadyExists', { name }),
+		});
+	}
+
+	const id = uuid();
+	const profile: Profile = {
+		name,
+		createdAt: (new Date()).toISOString(),
+		updatedAt: null,
+		misskeyVersion: version,
+		host,
+		settings: getSettings(),
+	};
+	await os.apiWithDialog('i/registry/set', { scope, key: id, value: profile });
+}
+
+function loadFile(): void {
+	const input = document.createElement('input');
+	input.type = 'file';
+	input.multiple = false;
+	input.onchange = async () => {
+		if (!profiles) return;
+		if (!input.files || input.files.length === 0) return;
+
+		const file = input.files[0];
+
+		if (file.type !== 'application/json') {
+			return os.alert({
+				type: 'error',
+				title: ts._preferencesBackups.cannotLoad,
+				text: ts._preferencesBackups.invalidFile,
+			});
+		}
+
+		let profile: Profile;
+		try {
+			profile = JSON.parse(await file.text()) as unknown as Profile;
+			validate(profile);
+		} catch (err) {
+			return os.alert({
+				type: 'error',
+				title: ts._preferencesBackups.cannotLoad,
+				text: err?.message,
+			});
+		}
+
+		const id = uuid();
+		await os.apiWithDialog('i/registry/set', { scope, key: id, value: profile });
+
+		// 一応廃棄
+		(window as any).__misskey_input_ref__ = null;
+	};
+
+	// https://qiita.com/fukasawah/items/b9dc732d95d99551013d
+	// iOS Safari で正常に動かす為のおまじない
+	(window as any).__misskey_input_ref__ = input;
+
+	input.click();
+}
+
+async function applyProfile(id: string): Promise<void> {
+	if (!profiles) return;
+
+	const profile = profiles[id];
+
+	const { canceled: cancel1 } = await os.confirm({
+		type: 'warning',
+		title: ts._preferencesBackups.apply,
+		text: t('_preferencesBackups.applyConfirm', { name: profile.name }),
+	});
+	if (cancel1) return;
+
+	// TODO: バージョン or ホストが違ったらさらに警告を表示
+
+	const settings = profile.settings;
+
+	// defaultStore
+	for (const key of defaultStoreSaveKeys) {
+		if (settings.hot[key] !== undefined) {
+			defaultStore.set(key, settings.hot[key]);
+		}
+	}
+	
+	// coldDeviceStorage
+	for (const key of coldDeviceStorageSaveKeys) {
+		if (settings.cold[key] !== undefined) {
+			ColdDeviceStorage.set(key, settings.cold[key]);
+		}
+	}
+
+	// fontSize
+	if (settings.fontSize) {
+		localStorage.setItem('fontSize', settings.fontSize);
+	} else {
+		localStorage.removeItem('fontSize');
+	}
+
+	// useSystemFont
+	if (settings.useSystemFont) {
+		localStorage.setItem('useSystemFont', settings.useSystemFont);
+	} else {
+		localStorage.removeItem('useSystemFont');
+	}
+
+	// wallpaper
+	if (settings.wallpaper != null) {
+		localStorage.setItem('wallpaper', settings.wallpaper);
+	} else {
+		localStorage.removeItem('wallpaper');
+	}
+
+	const { canceled: cancel2 } = await os.confirm({
+		type: 'info',
+		text: ts.reloadToApplySetting,
+	});
+	if (cancel2) return;
+
+	unisonReload();
+}
+
+async function deleteProfile(id: string): Promise<void> {
+	if (!profiles) return;
+
+	const { canceled } = await os.confirm({
+		type: 'info',
+		title: ts.delete,
+		text: t('deleteAreYouSure', { x: profiles[id].name }),
+	});
+	if (canceled) return;
+
+	await os.apiWithDialog('i/registry/remove', { scope, key: id });
+	delete profiles[id];
+}
+
+async function save(id: string): Promise<void> {
+	if (!profiles) return;
+
+	const { name, createdAt } = profiles[id];
+
+	const { canceled } = await os.confirm({
+		type: 'info',
+		title: ts._preferencesBackups.save,
+		text: t('_preferencesBackups.saveConfirm', { name }),
+	});
+	if (canceled) return;
+
+	const profile: Profile = {
+		name,
+		createdAt,
+		updatedAt: (new Date()).toISOString(),
+		misskeyVersion: version,
+		host,
+		settings: getSettings(),
+	};
+	await os.apiWithDialog('i/registry/set', { scope, key: id, value: profile });
+}
+
+async function rename(id: string): Promise<void> {
+	if (!profiles) return;
+
+	const { canceled: cancel1, result: name } = await os.inputText({
+		title: ts._preferencesBackups.inputName,
+	});
+	if (cancel1 || profiles[id].name === name) return;
+
+	if (Object.values(profiles).some(x => x.name === name)) {
+		return os.alert({
+			title: ts._preferencesBackups.cannotSave,
+			text: t('_preferencesBackups.nameAlreadyExists', { name }),
+		});
+	}
+
+	const registry = Object.assign({}, { ...profiles[id] });
+
+	const { canceled: cancel2 } = await os.confirm({
+		type: 'info',
+		title: ts._preferencesBackups.rename,
+		text: t('_preferencesBackups.renameConfirm', { old: registry.name, new: name }),
+	});
+	if (cancel2) return;
+
+	registry.name = name;
+	await os.apiWithDialog('i/registry/set', { scope, key: id, value: registry });
+}
+
+function menu(ev: MouseEvent, profileId: string) {
+	if (!profiles) return;
+
+	return os.popupMenu([{
+		text: ts._preferencesBackups.apply,
+		icon: 'fas fa-circle-down',
+		action: () => applyProfile(profileId),
+	}, {
+		type: 'a',
+		text: ts.download,
+		icon: 'fas fa-download',
+		href: URL.createObjectURL(new Blob([JSON.stringify(profiles[profileId], null, 2)], { type: 'application/json' })),
+		download: `${profiles[profileId].name}.json`,
+	}, null, {
+		text: ts.rename,
+		icon: 'fas fa-i-cursor',
+		action: () => rename(profileId),
+	}, {
+		text: ts._preferencesBackups.save,
+		icon: 'fas fa-floppy-disk',
+		action: () => save(profileId),
+	}, null, {
+		text: ts._preferencesBackups.delete,
+		icon: 'fas fa-trash-can',
+		action: () => deleteProfile(profileId),
+		danger: true,
+	}], ev.currentTarget ?? ev.target);
+}
+
+onMounted(() => {
+	// streamingのuser storage updateイベントを監視して更新
+	connection?.on('registryUpdated', ({ scope: recievedScope, key, value }) => {
+		if (!recievedScope || recievedScope.length !== scope.length || recievedScope[0] !== scope[0]) return;
+		if (!profiles) return;
+
+		profiles[key] = value;
+	});
+});
+
+onUnmounted(() => {
+	connection?.off('registryUpdated');
+});
+
+definePageMetadata(computed(() => ({
+	title: ts.preferencesBackups,
+	icon: 'fas fa-floppy-disk',
+	bg: 'var(--bg)',
+})));
+</script>
+
+<style lang="scss" module>
+.buttons {
+	display: flex;
+	gap: var(--margin);
+	flex-wrap: wrap;
+}
+
+.profile {
+	padding: 20px;
+	cursor: pointer;
+
+	&Name {
+		font-weight: 700;
+	}
+
+	&Time {
+		font-size: .85em;
+		opacity: .7;
+	}
+}
+</style>
diff --git a/packages/client/src/router.ts b/packages/client/src/router.ts
index a8743416f..6655a3619 100644
--- a/packages/client/src/router.ts
+++ b/packages/client/src/router.ts
@@ -145,6 +145,10 @@ export const routes = [{
 		path: '/deck',
 		name: 'deck',
 		component: page(() => import('./pages/settings/deck.vue')),
+	}, {
+		path: '/preferences-backups',
+		name: 'preferences-backups',
+		component: page(() => import('./pages/settings/preferences-backups.vue')),
 	}, {
 		path: '/other',
 		name: 'other',