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.
That is way beyond thee scope of this fork. Doesn't a screen recorder record video calls?
BTW, when the Android telecon framework is used some voice recording apps (try to) record it. I use Total Recall and it records half the conversation, only my part. Same for WhatsApp voice calls.
Add an option to record signal calls, even video calls