Uninstalling the app, or clearing its data, removes your history and alarms from the phone.
Before you do
- Open Settings > Backup/Restore and create a backup.
- Copy the file to a safe place, such as cloud storage.
- After reinstalling, restore it from Restore Data.
What Android may restore for you
Android's own backup can restore your app settings, including your lists, when you reinstall on the same Google account. History and alarms are restored only from a backup file you created.