Good exercise. I would like also to add consoles I've never owned (PS4 or Xbox 360 for example) but beat some games on those, as well as listing PS4 games on the PS4 list even if played on a PS5. So, based on the games in my profile:

Game Boy: Castlevania Legends (October 12th, 2024).
Game Boy Advance: Metroid Fusion (August 9th, 2021).
NES: Mike Tyson's Punch Out (May 21st, 2025).
Nintendo 3DS: Luigi's Mansion 2 (April 1st, 2017).
Nintendo 64: GoldenEye 007 (July 16th, 2024).
Nintendo DS: Pokémon Black (September 14th, 2016).
Nintendo GameCube: Luigi's Mansion (October 11th, 2014).
Nintendo Switch: Mario & Luigi: Brothership (May 16th, 2025).
PC: Far Cry 2 (February 28th, 2023).
PlayStation: Final Fantasy IX (December 10th, 2019).
PlayStation 2: God Of War II (June 8th, 2021).
PlayStation 3: Assassin's Creed (November 14th, 2023).
PlayStation 4: Assassin's Creed: Odyssey (April 12th, 2025).
PlayStation 5: Balatro (May 23rd, 2025).
Super Nintendo: F-Zero (February 14th, 2023).
Wii: Zelda: Skyward Sword (October 14th, 2017).
Wii U: Zelda: Wind Waker HD (May 10th, 2023).
Xbox 360: Borderlands 2 (March 24th, 2017).

Wow, I realized how long has it been since I've touched a GameCube or 3DS videogame.

My backlog consists of games that I’ve bought and still have access to. Feel free to use the list however you like, and you can also create custom lists to further organize your games.

I think that's a good idea, using it for the games I have but haven't played yet, I'll use it for that just for the sake of giving it some use.

I recently created an account into this site even though I've been visiting it for quite some time already. I would like to know how do some people use their backlog section.

In my case, I use the backlogs for games I've paused but plan on resuming. Once I've beaten them, I send them over to the complete section. Is this something unpopular to do or is it the intended way?

I'm not sure if it's the correct way but I place there the games I'm currently playing but not for the first time, the first plays goes to my "playing" section. Once I'm done, I send them to the completed games section.