Use what works

You don't need a single device for everything, a single notetaking app, a single sync tool for all sorts of files, a single backup process, a single workflow.

You don't need to do things a single way, or even a single time. You can write and rewrite without needing realtime multiplayer editing between your phone and your laptop, so you don't miss ideas while walking. You can move or copy text from one editor to another one.

You don't need a single copy of files, with symlinks and some elaborate normalization system for where the true copy of each file is stored. You don't need a complete version control system for every file. Have copies, have out of date copies, have v2_final_backup_real.md copies.

Just use what works.