Step 4 · Use it
Back Up Your Files
Keep your files from a distro in the app - there's no in-app backup yet, so copy them out with the Files app or the shared folders - and move a Termux backup into the app.
There's no backup for distros in the app yet. To keep your files, copy them out: your Linux home shows in Android's Files app under Andronix, and you can save files to ~/Android/Download or ~/Android/Documents in Linux, which appear in Download/Andronix and Documents/Andronix on your phone. See Android files in Linux.
You can bring a backup from Termux into the app: see Move a distro from Termux into the app.
For distros in Termux, andronix backup saves the whole distro: see Back up and restore in Termux.