For those interested in automatically backing up their ratings, automatically updating the POPM tag of tracks or automatically updating the Poweramp ratings from the POPM tags, New Playlist Manager (V226) now has the necessary intents.
Using Tasker, you can create a schedule that automatically does some or all of the above. .
The intents are:
com.flyingdutchman.newplaylistmanager.servicepopm2pa
com.flyingdutchman.newplaylistmanager.servicepa2popm
com.flyingdutchman.newplaylistmanager.serviceexportratings
Category: Launcher
Target: Service
or simply import the attached backup
backup.xml