I’m duplicating my server hardware and moving the second set off site. I want to keep the data live since the whole system will be load balanced with my on site system. I’ve contemplated tools like syncthing to make a 1 to 1 copy of the data to NAS B but i know there has to be a better way. What have you used successfully?
Rsync or rclone are better ways than syncthing. Rsync can copy over ssh out of the box. Rclone can do the same but with a lot more backends. FTP, SSH, S3… It does not matter. Imo is rclone the better choice than rsync in this case. Take a look at rclone.org