You can run rclone every couple minutes on your NAS, it checks mtimes like rsync so it is reasonably efficient for most cases, though you may run into ratelimits with bigger data.

Google Photos deliberately broke all backup tools in March, so there's that.

Yes you can still mostly do Takeout, but it's garbage. (not incremental. Requires me to remember. duplicates files for every album (total incompetence). downloads regularly fail. Requires more room than I have on my mac to decompress so I have to put it on an external drive.)