I'm using a small command line tool developed in go,

I have a base.md file and when I run personal init will open a new file for 'today' using base.md

I can also create a post/note/idea even mind map using markdown.

I've been using plain text for about 3 years, totally recommend it.

bonus tip, I use grep to find content in my files. and yes, I have a personal backup command :D