Definitely spamware. The app's screens get obliterated with an "Upgrade" popup. Have to scroll around to see what is underneath in the app. No way to get rid of the nuisance other than paying Google for more quota that I don't need. Well, the obvious solution is to uninstall the spamware which I did. Update 3/12/2022 (month later): Trialed it again. Still spamware. No way to get rid of the obliterating "Upgrade" overlay. The app offers no more features (other than adding MMS, but then I don't backup my text messages, anyway) than the embedded Backup service included in Android (which fails a third of the time with "Incomplete backup", and since the app uses this service then it will be just as unreliable, so I have to do a manual backup which always works).