I've always liked to document what I do. I've been recording pretty much everything my music band The Moonlight Club has been doing since day 1. It's notes, music sheets, iPhones recording, GoPro videos, Instagram posts, Facebook posts, etc. And we share a good chunk of this publicly. We keep a lot for ourselves too.
A lot of people think we do it for exposure or for visibility. But they underestimate the power of feedback. Documenting what you do, publishing it and looking back at it accelerates the feedback loop. You might have an opinion on how you're doing but your paper (read: digital) trail is the reality. And it creates this virtuous circle of looking back (and in our case 'hearing' back') on things we've done and wanting to do it slightly better. And this can compound over many years. That's the beauty of feedback.