diff --git a/native/account/registration/avatar-selection.react.js b/native/account/registration/avatar-selection.react.js
--- a/native/account/registration/avatar-selection.react.js
+++ b/native/account/registration/avatar-selection.react.js
@@ -21,11 +21,13 @@
   type AvatarData,
   ensAvatarSelection,
 } from './registration-types.js';
+import { enableSIWEBackupCreation } from './registration-types.js';
 import EditUserAvatar from '../../avatars/edit-user-avatar.react.js';
 import { useCurrentLeafRouteName } from '../../navigation/nav-selectors.js';
 import {
   type NavigationRoute,
   RegistrationTermsRouteName,
+  CreateSIWEBackupMessageRouteName,
   AvatarSelectionRouteName,
   EmojiAvatarSelectionRouteName,
   RegistrationUserAvatarCameraModalRouteName,
@@ -144,6 +146,16 @@
       ...userSelections,
       avatarData,
     };
+    if (
+      userSelections.accountSelection.accountType === 'ethereum' &&
+      enableSIWEBackupCreation
+    ) {
+      navigate<'CreateSIWEBackupMessage'>({
+        name: CreateSIWEBackupMessageRouteName,
+        params: { userSelections: newUserSelections },
+      });
+      return;
+    }
     navigate<'RegistrationTerms'>({
       name: RegistrationTermsRouteName,
       params: { userSelections: newUserSelections },
diff --git a/native/account/registration/registration-navigator.react.js b/native/account/registration/registration-navigator.react.js
--- a/native/account/registration/registration-navigator.react.js
+++ b/native/account/registration/registration-navigator.react.js
@@ -17,6 +17,7 @@
 import KeyserverSelection from './keyserver-selection.react.js';
 import PasswordSelection from './password-selection.react.js';
 import RegistrationTerms from './registration-terms.react.js';
+import CreateSIWEBackupMessage from './siwe-backup-message-creation.react.js';
 import UsernameSelection from './username-selection.react.js';
 import RegistrationUserAvatarCameraModal from '../../media/registration-user-avatar-camera-modal.react.js';
 import type { RootNavigationProp } from '../../navigation/root-navigator.react.js';
@@ -24,6 +25,7 @@
   KeyserverSelectionRouteName,
   CoolOrNerdModeSelectionRouteName,
   ConnectEthereumRouteName,
+  CreateSIWEBackupMessageRouteName,
   ExistingEthereumAccountRouteName,
   UsernameSelectionRouteName,
   ConnectFarcasterRouteName,
@@ -89,6 +91,10 @@
         name={ConnectFarcasterRouteName}
         component={ConnectFarcaster}
       />
+      <Registration.Screen
+        name={CreateSIWEBackupMessageRouteName}
+        component={CreateSIWEBackupMessage}
+      />
       <Registration.Screen
         name={UsernameSelectionRouteName}
         component={UsernameSelection}
diff --git a/native/account/registration/registration-types.js b/native/account/registration/registration-types.js
--- a/native/account/registration/registration-types.js
+++ b/native/account/registration/registration-types.js
@@ -5,7 +5,7 @@
   ClientAvatar,
 } from 'lib/types/avatar-types.js';
 import type { NativeMediaSelection } from 'lib/types/media-types.js';
-import type { SIWEResult } from 'lib/types/siwe-types.js';
+import type { SIWEResult, SIWEBackupSecrets } from 'lib/types/siwe-types.js';
 
 export type CoolOrNerdMode = 'cool' | 'nerd';
 
@@ -53,6 +53,7 @@
   +avatarData?: ?AvatarData,
   +ethereumAccount?: EthereumAccountSelection,
   +farcasterID?: string,
+  +siweBackupSecrets?: ?SIWEBackupSecrets,
 };
 
 export const ensAvatarSelection: AvatarData = {
@@ -62,3 +63,5 @@
 };
 
 export const enableNewRegistrationMode = __DEV__;
+
+export const enableSIWEBackupCreation = __DEV__;
diff --git a/native/account/registration/siwe-backup-message-creation.react.js b/native/account/registration/siwe-backup-message-creation.react.js
new file mode 100644
--- /dev/null
+++ b/native/account/registration/siwe-backup-message-creation.react.js
@@ -0,0 +1,187 @@
+// @flow
+
+import Icon from '@expo/vector-icons/MaterialIcons.js';
+import invariant from 'invariant';
+import * as React from 'react';
+import { View, Text } from 'react-native';
+
+import { type SIWEResult, SIWEMessageTypes } from 'lib/types/siwe-types.js';
+
+import RegistrationButtonContainer from './registration-button-container.react.js';
+import RegistrationButton from './registration-button.react.js';
+import RegistrationContainer from './registration-container.react.js';
+import RegistrationContentContainer from './registration-content-container.react.js';
+import { RegistrationContext } from './registration-context.js';
+import { type RegistrationNavigationProp } from './registration-navigator.react.js';
+import type {
+  CoolOrNerdMode,
+  AccountSelection,
+  AvatarData,
+} from './registration-types.js';
+import {
+  type NavigationRoute,
+  RegistrationTermsRouteName,
+} from '../../navigation/route-names.js';
+import { useStyles } from '../../themes/colors.js';
+import SIWEPanel from '../siwe-panel.react.js';
+
+export type CreateSIWEBackupMessageParams = {
+  +userSelections: {
+    +coolOrNerdMode: CoolOrNerdMode,
+    +keyserverURL: string,
+    +farcasterID: ?string,
+    +accountSelection: AccountSelection,
+    +avatarData: ?AvatarData,
+  },
+};
+
+type PanelState = 'closed' | 'opening' | 'open' | 'closing';
+
+type Props = {
+  +navigation: RegistrationNavigationProp<'CreateSIWEBackupMessage'>,
+  +route: NavigationRoute<'CreateSIWEBackupMessage'>,
+};
+function CreateSIWEBackupMessage(props: Props): React.Node {
+  const { navigate } = props.navigation;
+  const { params } = props.route;
+
+  const styles = useStyles(unboundStyles);
+
+  const [panelState, setPanelState] = React.useState<PanelState>('closed');
+
+  const openPanel = React.useCallback(() => {
+    setPanelState('opening');
+  }, []);
+  const onPanelClosed = React.useCallback(() => {
+    setPanelState('closed');
+  }, []);
+  const onPanelClosing = React.useCallback(() => {
+    setPanelState('closing');
+  }, []);
+
+  const siwePanelSetLoading = React.useCallback(
+    (loading: boolean) => {
+      if (panelState === 'closing' || panelState === 'closed') {
+        return;
+      }
+      setPanelState(loading ? 'opening' : 'open');
+    },
+    [panelState],
+  );
+
+  const registrationContext = React.useContext(RegistrationContext);
+  invariant(registrationContext, 'registrationContext should be set');
+  const { cachedSelections, setCachedSelections } = registrationContext;
+
+  const onSuccessfulWalletSignature = React.useCallback(
+    (result: SIWEResult) => {
+      const { message, signature } = result;
+      setCachedSelections(oldUserSelections => ({
+        ...oldUserSelections,
+        siweBackupSecrets: { message, signature },
+      }));
+      navigate<'RegistrationTerms'>({
+        name: RegistrationTermsRouteName,
+        params,
+      });
+    },
+    [navigate, params, setCachedSelections],
+  );
+
+  const onExistingWalletSignature = React.useCallback(() => {
+    navigate<'RegistrationTerms'>({
+      name: RegistrationTermsRouteName,
+      params,
+    });
+  }, [params, navigate]);
+
+  let siwePanel;
+  if (panelState !== 'closed') {
+    siwePanel = (
+      <SIWEPanel
+        onClosing={onPanelClosing}
+        onClosed={onPanelClosed}
+        closing={panelState === 'closing'}
+        onSuccessfulWalletSignature={onSuccessfulWalletSignature}
+        siweMessageType={SIWEMessageTypes.MSG_BACKUP}
+        setLoading={siwePanelSetLoading}
+      />
+    );
+  }
+
+  const { siweBackupSecrets } = cachedSelections;
+
+  const newSignatureButtonText = siweBackupSecrets
+    ? 'Encrypt with new signature'
+    : 'Encrypt with Ethereum Wallet';
+  const newSignatureButtonVariant = siweBackupSecrets ? 'outline' : 'enabled';
+
+  let useExistingSignatureButton;
+  if (siweBackupSecrets) {
+    useExistingSignatureButton = (
+      <RegistrationButton
+        onPress={onExistingWalletSignature}
+        label="Encrypt with existing signature"
+        variant="enabled"
+      />
+    );
+  }
+
+  const body = (
+    <Text style={styles.body}>
+      Comm encrypts user backups so that our backend is not able to see user
+      data.
+    </Text>
+  );
+
+  return (
+    <>
+      <RegistrationContainer>
+        <RegistrationContentContainer style={styles.scrollViewContentContainer}>
+          <Text style={styles.header}>Encrypting your Comm Backup</Text>
+          {body}
+          <View style={styles.siweBackupIconContainer}>
+            <Icon name="backup" size={200} style={styles.siweBackupIcon} />
+          </View>
+        </RegistrationContentContainer>
+        <RegistrationButtonContainer>
+          {useExistingSignatureButton}
+          <RegistrationButton
+            onPress={openPanel}
+            label={newSignatureButtonText}
+            variant={newSignatureButtonVariant}
+          />
+        </RegistrationButtonContainer>
+      </RegistrationContainer>
+      {siwePanel}
+    </>
+  );
+}
+
+const unboundStyles = {
+  scrollViewContentContainer: {
+    flexGrow: 1,
+  },
+  header: {
+    fontSize: 24,
+    color: 'panelForegroundLabel',
+    paddingBottom: 16,
+  },
+  body: {
+    fontFamily: 'Arial',
+    fontSize: 15,
+    lineHeight: 20,
+    color: 'panelForegroundSecondaryLabel',
+    paddingBottom: 16,
+  },
+  siweBackupIcon: {
+    color: 'panelForegroundIcon',
+  },
+  siweBackupIconContainer: {
+    flexGrow: 1,
+    alignItems: 'center',
+    justifyContent: 'center',
+  },
+};
+
+export default CreateSIWEBackupMessage;
diff --git a/native/navigation/route-names.js b/native/navigation/route-names.js
--- a/native/navigation/route-names.js
+++ b/native/navigation/route-names.js
@@ -12,6 +12,7 @@
 import type { KeyserverSelectionParams } from '../account/registration/keyserver-selection.react.js';
 import type { PasswordSelectionParams } from '../account/registration/password-selection.react.js';
 import type { RegistrationTermsParams } from '../account/registration/registration-terms.react.js';
+import type { CreateSIWEBackupMessageParams } from '../account/registration/siwe-backup-message-creation.react.js';
 import type { UsernameSelectionParams } from '../account/registration/username-selection.react.js';
 import type { TermsAndPrivacyModalParams } from '../account/terms-and-privacy-modal.react.js';
 import type { ThreadPickerModalParams } from '../calendar/thread-picker-modal.react.js';
@@ -121,6 +122,7 @@
 export const KeyserverSelectionRouteName = 'KeyserverSelection';
 export const CoolOrNerdModeSelectionRouteName = 'CoolOrNerdModeSelection';
 export const ConnectEthereumRouteName = 'ConnectEthereum';
+export const CreateSIWEBackupMessageRouteName = 'CreateSIWEBackupMessage';
 export const ExistingEthereumAccountRouteName = 'ExistingEthereumAccount';
 export const ConnectFarcasterRouteName = 'ConnectFarcaster';
 export const UsernameSelectionRouteName = 'UsernameSelection';
@@ -261,6 +263,7 @@
   +ConnectEthereum: ConnectEthereumParams,
   +ExistingEthereumAccount: ExistingEthereumAccountParams,
   +ConnectFarcaster: ConnectFarcasterParams,
+  +CreateSIWEBackupMessage: CreateSIWEBackupMessageParams,
   +UsernameSelection: UsernameSelectionParams,
   +PasswordSelection: PasswordSelectionParams,
   +AvatarSelection: AvatarSelectionParams,
diff --git a/native/themes/colors.js b/native/themes/colors.js
--- a/native/themes/colors.js
+++ b/native/themes/colors.js
@@ -109,6 +109,7 @@
   panelForeground: designSystemColors.shadesWhite100,
   panelForegroundBorder: designSystemColors.shadesWhite60,
   panelForegroundLabel: designSystemColors.shadesBlack95,
+  panelForegroundIcon: designSystemColors.shadesBlack95,
   panelForegroundSecondaryLabel: '#333333',
   panelForegroundTertiaryLabel: '#888888',
   panelInputBackground: designSystemColors.shadesWhite60,
@@ -211,6 +212,7 @@
   panelForeground: designSystemColors.shadesBlack85,
   panelForegroundBorder: '#2C2C2E',
   panelForegroundLabel: designSystemColors.shadesWhite100,
+  panelForegroundIcon: designSystemColors.shadesWhite100,
   panelForegroundSecondaryLabel: designSystemColors.shadesWhite60,
   panelForegroundTertiaryLabel: '#AAAAAA',
   panelInputBackground: designSystemColors.shadesBlack75,