I use Beyond Compare to sync files from my laptop to my NAS which is a QNAP (my laptop is Linux Mint). It is incredibly slow, to the point that it is driving me crazy. Admittedly, I have lots of large files on my laptop that I move around frequently, so that may just be how it is. I do have my laptop setup to sync to my phone with Syncthing, and it seems like my phone is always up-to-date and in sync with my laptop. But of course it is syncing in, I guess, "real time" as opposed to a Beyond Compare backup which does everything only when I tell it to when lots of changes have already been made at the end of the day. Is it possible to install Syncthing on QNAP? Perhaps that would make things a bit faster, although I've always had a hell of a time trying to install something that isn't a proprietary app from their store. Anyway, any suggestions are welcome.

EDIT: Plugging into ethernet instead of syncing over wi-fi helps speed things up a bit, but not as much as I would like.