Probably not as often as I should... But I do it in multiple ways.
- Taking a photo of passwords.
- Saving the passwords in a .txt document. (using my phone as a usb memory).
- Writing down the passwords on a piece of paper.
If I backup certain files on my computer, I usually transfer them to my phone and/or on of my old crappy laptop that barely runs. :D
A photo is pretty solid, as long as it's printed kept somewhere safe and done each time.
Another person with 3/4 locations, should be ok!