It seems that the options for backup are:
1. Use takeout to get a single backup.
That's it.
There is no way I can tell to get incremental backups. It seems that there used to be[0][1], but some permissions changes on Google's side made them impossible.
Is there really no way to do this?
What alternatives are worth considering for a cloud based photo tool, that actually allows you to backup?
[0] https://rclone.org/googlephotos/#limitations
[1] https://github.com/gilesknap/gphotos-sync
Somewhat manual, using takeout (seems a lot of effort): https://www.markhansen.co.nz/google-photos-backup/
A script using a headless browser (maybe scriptable, but sounds brittle): https://github.com/vikas5914/google-photos-backup
Can it be used alongside Google photos so as pictures are taken they're backed up to both services?