Hello,
I am a regular user of your app, and I really appreciate that you’ve implemented a feature to export settings.
This export is currently manual, which means users have to remember to trigger it themselves on a regular basis - with the risk of forgetting and thus losing their settings in the event of a device change or technical issue.
Here are my two suggestions for improvement :
1. Add an option for automatic, periodic backup of settings (with a frequency configurable by the user), in addition to the existing manual export feature.
2. Allow users to freely choose the destination folder for the backup file, to facilitate its integration into a personal backup workflow (local storage, cloud, …).
This would safeguard data, save time, prevent forgetfulness, and greatly simplify the process of switching to a new smartphone.
If you want some ideas, I find really convenient the automatic settings backup of the app Signal, called “back up on this device” 
Thank you very much for considering this suggestion, and I look forward to hearing your feedback!
Best regards