I can say the best habit I ever have is keeping a diary every single day. The habit starts when I was in middle school. Diary is a homework for us at that time. There are no secrets that cannot be shared. After graduation, my Chinese teacher wanted to publish a book on his education journey so he borrowed all my 6 diaries. He never gave back to me since then. He lost all of them.
When I was in college, I used Evernote free edition to write diaries. One day the system was upgrading and when I logged in again I lost all of them. Never get them back.
During master school in NYU, I started to use “day one journal” to write the diary. However, my laptop was reset and all the data lost too.
I lost all my written past. Only some clips in my memory.