Add a note to the quickstart guide

Author: eandreeva-twr

versioned_docs/version-3.0/ios-quickstart-identify.md

@@ -41,6 +41,10 @@ If you don't have backend authentication, **you don't need to handle authenticat
 3. When the user **re-installs** the app or installs it from a **new device**, Adapty **creates a new anonymous profile on activation**.
 4. If the user has previously made purchases in your app, by default, their purchases are automatically synced from the App Store on the SDK activation.
 
+:::note
+Backup restores behave differently from reinstalls. By default, when a user restores from a backup, the SDK preserves cached data and does not create a new profile. You can configure this behavior using the `clearDataOnBackup` setting. [Learn more](sdk-installation-ios#clear-data-on-backup-restore).
+:::
+
 So, with anonymous users, new profiles will be created on each installation, but that's not a problem because, in the Adapty analytics, you can [configure what will be considered a new installation](general#4-installs-definition-for-analytics).
 
 For anonymous users, you need to count installs by **device IDs**. In this case, each app installation on a device is counted as an install, including reinstalls.