I finished a game I had in my backlog for over 20 years.

[Xxain]

Barozi said:

Does it even count as backlog when you didn't own the game for 20 years?
Just asking as this would increase my backlog by a huge margin.

It is something that I was absolutely intending to play eventually vs just knowing about a game and not caring then deciding to play it. Think about it in the sense of a wishlist.