Back up officially purchased app as APK (no root)?
Version: Android 11
Context: The app has been de-listed from the Play Store but I have the app installed from an official purchase. I want to move the app to another device.
I found this https://android.stackexchange.com/questions/49114/how-do-i-save-purchased-apps-as-apks but it requires rooting and the "AppMonster" app linked in the accepted answer is no longer available. The discussion also pertains to a very old Android version.
Is there a newer method available without rooting? I don't want to void my warranty just yet.
There are plenty of https://android.izzysoft.de/applists/category/named/file_backup available specialized on this (also some file managers like Amaze mentioned in Robert's comment on your question cover this as well) – or you could simply use /questions/tagged/adb .
If you're on Linux (Mac or Cygwin should work as well), my tool Adebar has a fitting script in https://codeberg.org/izzy/Adebar/src/branch/master/tools which can even deal with split APKs, watch out for
getapk: when called without parameters it gives you details on its syntax. The script can extract single APKs, or APKs of all system or user-installed apps at once.