I have been using Android phones forever and recently purchased a REVVL 5G which runs Android 10. Apps that I run like OneDrive, SMS Backup and Sync, PocketCasts, Tempest Weather, and others need to run in the background to backup photos, SMS, download podcasts overnight, alert on weather from my weather station etc.
What is happening is that if you launch the app the backup processes work, alerts come in etc. Then eventually while not using the apps their background tasks are being killed by Android. I have validated that the battery saver is off for these apps since that is what every support site for the apps say to do. So if you look at this image for SMS Backup and Restore the battery management is off:

But whey the app tries to perform it’s daily backup of the SMS messages:

And vendor of the app has confirmed that the correct battery setting for the App and the System is correct so there is something going on here with the Phone/Android. These apps worked just fine on my older phone which was a Moto G 7 series.
What can I do to get the background functionality of these apps to work again?