Rclone compatibility with Android app encryption?

You can run rclone from termux on android so you could use that as part of a solution.

pkg install rclone

Then you'll find your photos in storage/dcim/Camera

So you can run a script like this

#!/bin/bash
# backup photos

DEST=remote:phone_backup

rclone sync --fast-list --exclude ".thumbnails/**" -P ~/storage/dcim ${DEST}/current --backup-dir ${DEST}/$(date +%Y-%m-%d-%H%M%S)

You can then run that via termux:boot using the termux job scheduler

Contents of .termux/boot/rclone.sh

#!/bin/bash
# every 4 hours if on wifi and charging, run backup
termux-job-scheduler -s ~/bin/backup.sh --period-ms 14400000 --network unmetered --charging true