[howolduis]

Rclone.

https://rclone.org/commands/rclone_sync/

Configure cron jobs to run automatically so they dont have to do anything on their end. Even if you're on a mobile device, you can install a terminal emulator and run rclone there.

[ramses0]

FYI `rclone` is good for "dumb content" in that it doesn't keep execute bits on shell-scripts, etc.

[michaelgrafl]

Cool idea, but I don't think it's quite simple enough for OP.

[howolduis]

I thought OP was setting up a backup for someone else