Fork from a private messenger for Android with extra options added: full backup and (partial, ony text) xml backup of messages. Restore can happen at any time, not only after a fresh install. Import SMS database. Import of (unencrypted) WhatsApp databases. Removed apk expire. Choose between passphrase protection and the Android screenlock. Choice for the backup location (internal or removable storage on Android < 11 (on 11 and higher this is already possible)). Set the maptype in the place picker. Option to treat view-once media as normal media. Option to ignore remote deletion. Choose between FCM or websocket notification delivery.
Group messages are probably not sms but mms, and the import of mms is not supported. And if I wrote it I can't even test it here because all telco's have dropped mms support years ago here.
I'm trying to check if I was doing something wrong on my backups and was wondering if Group Messages were also able to be imported from SMS?