If you're new to Signal, it might feel a little overwhelming to get the hang of, but you can get it set up and working pretty quickly. https://ssd.eff.org/module/how-to-use-signal
How to: Use Signal

Download location: Google Play Store, Apple App Store System requirements: Android 5 or later, iOS 13 or later Version used in this guide: Android: 7.38.6 iPhone: 7.5.1 License: GPLv3 Level: Beginner Time required: 15-20 minutes Other reading: https://signal.org/ https://support.signal.org/ https://signal.org/blog/ Table of Contents Download and Install Signal Register and Verify...

@eff But you cannot make Backups of your data to your own devices/servers. You cannot make backups at all on non-US servers (paying aside). I therefore can not recommend Signal at all.