Termux with rsync installed. Then sync needed folders. For app data you need to be rooted. But you can basically rsync your entire phone to a lan ssh server. Yo

Termux with rsync installed. Then sync needed folders. For app data you need to be rooted. But you can basically rsync your entire phone to a lan ssh server. You can even schedule it with cron or other Without root, most recent lineageos, which you can use not rooted, comes with a backup option to a Nextcloud of your choice