I think I have a single Steam game from within which I can then run those games. How would I backup the delisted games?
That’s the Sega Genesis/Mega Drive Classics collection. I have it myself (bought several years ago). It’s just an official emulator/GUI wrapper (styled like a bedroom with a CRT) that comes with the games. If you have the collection you can find all the ROMs in the collection’s folder and play them with whatever emulator you want. If Steam ever threatens to take them away I strongly recommend backing that folder up somewhere.
No, you need to install them as well. It’ll work as long as it’s installed, but after they’re delisted, I don’t think steam can even distribute them.
I know I have at least one game “grid: race driver” that was delisted from steam, at some point I must have uninstalled it, and now I can’t download it, it doesn’t even show up in my library. I’ve been trying like hell to find a way to play it, but even pirated versions are being difficult.
Edit: judging from comments and downvotes, apparently this is rare? But it does definitely happen, I’m not making this example up. And I don’t know how you could predict whether a game will just be unavailable for purchase or totally disappear…
Removing games from player inventory is very rare; I’ve only seen it happen when malware is uploaded to Steam as a game.
I have a few games that can’t be played anymore, like Super Bomberman R Online and The Crew. I still can download their files from Steam; but I can’t play them.
But now I’m curious too, what could’ve happened that got that game removed from the people who bought the game
This is not the case with the sega games we’re talking about. The announcement specifically mentions the games will still be available to download if you bought them before the delisting.
It’s extremely rare for a delisted game to be removed from your library, and they only do it in cases where, for instance, the game would literally be unplayable because the server isn’t there anymore. Often times they won’t remove the game from your library in that situation either. Having the game in your library is, in fact, enough.