I built myself a system that sends me an email every day, and all I have to do is respond to that email; the answers get stored in an SQLite database, which is

I built myself a system that sends me an email every day, and all I have to do is respond to that email; the answers get stored in an SQLite database, which is backed up on Dropbox. So, opposite to you, my system lets me revisit and read my previous thoughts, something I do enjoy. It's also a great tracking system that tells me when this or that event happened. But, like you, it's not dependent on any specific tool. I can lose my phone and all my devices, as long as I can receive and send email, it'll work.