I also use Syncthing to backup my Android photos, videos, ...
I also had a Raspberry PI 3 with Arch Linux and Syncthing to do the same with family phones. Maybe I'll change it for OpenBSD.
I used taskwsrrior in the past, but I love org-mode, it's more flexible.
Fortunately, there are options to us to find each one its own path. I started to use one tool for each job until I got tired of migrating form tool to tool when it was not good enough for the job or worst, got abandoned. So I took the decision to stick with the classics for the most essential jobs. First Vim/Mutt/etc and then Emacs. If they survived three decades or more, probably will last a few years more. :-)