This is my app, that can be installed from:

Windows version

Primary version.

English: https://www.microsoft.com/en-us/p/b/9nl4kgs4q1s8
Język polski: https://www.microsoft.com/pl-pl/p/b/9nl4kgs4q1s8

Android version

(works) To run it, you must use UnoPlatform with PR#3055 and PR#2544

Privacy policy

https://github.com/pkar70/BackupSMS/wiki/Privacy-policy

For history (in Polish), see MainPage.xaml.cs file.