diff --git a/_inc/client/components/jetpack-notices/index.jsx b/_inc/client/components/jetpack-notices/index.jsx
index bed0e3bef0ec..7b97a1017683 100644
--- a/_inc/client/components/jetpack-notices/index.jsx
+++ b/_inc/client/components/jetpack-notices/index.jsx
@@ -25,6 +25,7 @@ import { isDevVersion, userCanConnectSite, userIsSubscriber } from 'state/initia
 import DismissableNotices from './dismissable';
 import JetpackBanner from 'components/jetpack-banner';
 import { JETPACK_CONTACT_BETA_SUPPORT } from 'constants/urls';
+import PlanConflictWarning from './plan-conflict-warning';
 
 export class DevVersionNotice extends React.Component {
 	static displayName = 'DevVersionNotice';
@@ -199,6 +200,7 @@ class JetpackNotices extends React.Component {
 					isStaging={ this.props.isStaging }
 					isInIdentityCrisis={ this.props.isInIdentityCrisis }
 				/>
+				<PlanConflictWarning />
 				<DismissableNotices />
 				<UserUnlinked
 					connectUrl={ this.props.connectUrl }
diff --git a/_inc/client/components/jetpack-notices/plan-conflict-warning.jsx b/_inc/client/components/jetpack-notices/plan-conflict-warning.jsx
new file mode 100644
index 000000000000..97b1d72f793a
--- /dev/null
+++ b/_inc/client/components/jetpack-notices/plan-conflict-warning.jsx
@@ -0,0 +1,93 @@
+/**
+ * External dependencies
+ */
+import React from 'react';
+import { connect } from 'react-redux';
+import { translate as __ } from 'i18n-calypso';
+import { withRouter } from 'react-router';
+
+/**
+ * Internal dependencies
+ */
+import SimpleNotice from 'components/notice';
+import { getActiveSitePurchases } from 'state/site';
+
+export function PlanConflictWarning( {
+	activeSitePurchases,
+	router: {
+		location: { pathname },
+	},
+} ) {
+	// Only show on plans page.
+	if ( '/plans' !== pathname ) {
+		return null;
+	}
+
+	// If we only have a single purchase, this isn't required.
+	if ( activeSitePurchases.length <= 1 ) {
+		return null;
+	}
+
+	// Strip "monthly" suffixes.
+	const activeSitePurchasesTrimmed = activeSitePurchases.map( ( { product_slug, ...props } ) => ( {
+		...props,
+		product_slug: product_slug.replace( '_monthly', '' ),
+	} ) );
+
+	// Gets the current backup, if any.
+	const backupPurchase = activeSitePurchasesTrimmed.find( ( { product_slug } ) =>
+		product_slug.includes( 'backup' )
+	);
+	if ( ! backupPurchase ) {
+		return null;
+	}
+
+	// Get the site plan purchase.
+	const sitePlanPurchase = activeSitePurchasesTrimmed.find(
+		( { product_slug } ) =>
+			'jetpack_personal' === product_slug ||
+			'jetpack_premium' === product_slug ||
+			'jetpack_business' === product_slug
+	);
+	if ( ! sitePlanPurchase ) {
+		return null;
+	}
+
+	// If the user purchased real-time backups and doesn't have Professional plan, it's not a conflict.
+	if (
+		'jetpack_backup_realtime' === backupPurchase.product_slug &&
+		'jetpack_business' !== sitePlanPurchase.product_slug
+	) {
+		return null;
+	}
+
+	let featureName = __( 'daily backups' );
+	if ( 'jetpack_business' === sitePlanPurchase.product_slug ) {
+		featureName = __( 'real-time backups' );
+	}
+
+	return (
+		<SimpleNotice
+			status="is-warning"
+			showDismiss={ false }
+			text={ __(
+				'Your %(planName)s Plan includes %(featureName)s. ' +
+					'Looks like you also purchased the %(productName)s product. ' +
+					'Consider removing %(productName)s.',
+				{
+					args: {
+						featureName,
+						planName: sitePlanPurchase.product_name,
+						productName: backupPurchase.product_name,
+					},
+				}
+			) }
+		/>
+	);
+}
+
+const PlanConflictWarningWithRouter = withRouter( PlanConflictWarning );
+
+export default connect( state => ( {
+	activeSitePurchases: getActiveSitePurchases( state ),
+} ) )( PlanConflictWarningWithRouter );
diff --git a/_inc/client/components/jetpack-notices/test/component.js b/_inc/client/components/jetpack-notices/test/component.js
new file mode 100644
index 000000000000..a5ccb4344692
--- /dev/null
+++ b/_inc/client/components/jetpack-notices/test/component.js
@@ -0,0 +1,89 @@
+/**
+ * External dependencies
+ */
+import React from 'react';
+import { shallow } from 'enzyme';
+import { expect } from 'chai';
+
+/**
+ * Internal dependencies
+ */
+import { PlanConflictWarning } from '../plan-conflict-warning';
+
+describe( 'PlanConflictWarning', () => {
+	const router = { location: { pathname: '/plans' } };
+
+	const personalPlan = {
+		product_slug: 'jetpack_personal',
+		product_name: 'Jetpack Personal',
+	};
+
+	const professionalPlan = {
+		product_slug: 'jetpack_business',
+		product_name: 'Jetpack Professional',
+	};
+
+	const dailyBackups = {
+		product_slug: 'jetpack_backup_daily',
+		product_name: 'Jetpack Backup (Daily)',
+	};
+
+	const realTimeBackups = {
+		product_slug: 'jetpack_backup_realtime',
+		product_name: 'Jetpack Backup (Real-time)',
+	};
+
+	it( 'should not render when not in correct path', () => {
+		const wrapper = shallow( <PlanConflictWarning router={ { location: { pathname: '/test' } } } /> );
+		expect( wrapper.isEmptyRender() ).to.equal( true );
+	} );
+
+	it( 'should not render when there are no purchases', () => {
+		const wrapper = shallow( <PlanConflictWarning router={ router } activeSitePurchases={ [] } /> );
+		expect( wrapper.isEmptyRender() ).to.equal( true );
+	} );
+
+	it( 'should not render when there is one purchase', () => {
+		const wrapper = shallow( <PlanConflictWarning router={ router } activeSitePurchases={ [ {} ] } /> );
+		expect( wrapper.isEmptyRender() ).to.equal( true );
+	} );
+
+	it( 'should not render when there is no backup purchase', () => {
+		const wrapper = shallow( <PlanConflictWarning router={ router } activeSitePurchases={ [ personalPlan ] } /> );
+		expect( wrapper.isEmptyRender() ).to.equal( true );
+	} );
+
+	it( 'should not render when there is no site plan purchase', () => {
+		const wrapper = shallow( <PlanConflictWarning router={ router } activeSitePurchases={ [ dailyBackups ] } /> );
+		expect( wrapper.isEmptyRender() ).to.equal( true );
+	} );
+
+	it( 'should not render with both real-time backups and a non-professional plan', () => {
+		const wrapper = shallow( <PlanConflictWarning router={ router } activeSitePurchases={ [ realTimeBackups, personalPlan ] } /> );
+		expect( wrapper.isEmptyRender() ).to.equal( true );
+	} );
+
+	it( 'should not render with both real-time monthly backups and a non-professional plan', () => {
+		const realTimeBackupsMontly = { product_slug: 'jetpack_backups_realtime_monthly', ...realTimeBackups };
+		const wrapper = shallow( <PlanConflictWarning router={ router } activeSitePurchases={ [ realTimeBackupsMontly, personalPlan ] } /> );
+		expect( wrapper.isEmptyRender() ).to.equal( true );
+	} );
+
+	it( 'should show warning with both daily backups and a plan', () => {
+		const wrapper = shallow( <PlanConflictWarning router={ router } activeSitePurchases={ [ dailyBackups, personalPlan ] } /> );
+		expect( wrapper.prop( 'text' ) ).to.equal(
+			'Your Jetpack Personal Plan includes daily backups. ' +
+			'Looks like you also purchased the Jetpack Backup (Daily) product. ' +
+			'Consider removing Jetpack Backup (Daily).'
+		);
+	} );
+
+	it( 'should show warning with both real-time backups and a Professional plan', () => {
+		const wrapper = shallow( <PlanConflictWarning router={ router } activeSitePurchases={ [ realTimeBackups, professionalPlan ] } /> );
+		expect( wrapper.prop( 'text' ) ).to.equal(
+			'Your Jetpack Professional Plan includes real-time backups. ' +
+			'Looks like you also purchased the Jetpack Backup (Real-time) product. ' +
+			'Consider removing Jetpack Backup (Real-time).'
+		);
+	} );
+} );