is it possible to lose the de jure right to install the game in that way due to licensing issues on GOG’s end
Someone can correct me if I’m wrong, but my understanding is that no, you can’t. When you buy the game, you’ve obtained a perpetual license to install and play that game, similar to what you’d have if you bought the game on a disk. You can lose your ability to download the game, that isn’t guaranteed to be unlimited or perpetual, but installing it via the installer you downloaded, and playing it once you do, are forever. (This is in contrast to something like Steam, where you rely on their servers granting you permission to install the game, and that permission can be revoked.)
How is backing up an installer from GoG different in any way to backup a game folder in Steam?
Both can be copied to a different computer and used to run the game offline forever (unless of course the game has DRM, in which case both suffer from the same problem).
Someone can correct me if I’m wrong, but my understanding is that no, you can’t. When you buy the game, you’ve obtained a perpetual license to install and play that game, similar to what you’d have if you bought the game on a disk. You can lose your ability to download the game, that isn’t guaranteed to be unlimited or perpetual, but installing it via the installer you downloaded, and playing it once you do, are forever. (This is in contrast to something like Steam, where you rely on their servers granting you permission to install the game, and that permission can be revoked.)
How is backing up an installer from GoG different in any way to backup a game folder in Steam?
Both can be copied to a different computer and used to run the game offline forever (unless of course the game has DRM, in which case both suffer from the same problem).