amok: non of the games you get via galaxy need internt after download either.
eric5h5: Not actually true, since you'd need to re-download if you uninstall the game, since you don't have an offline installer you can use. It's not necessarily as easy as just zipping the game for archiving. That would work for Mac games (not sure about Linux), but some Windows games have other components that the installer puts in the system. And on all platforms, you typically need installers for DLC. Even if that wasn't an issue, for all your games you'd still have to add the step of installing via Galaxy, making an archive, and then uninstalling, instead of just downloading and storing the offline installers.
no, you just zip the folder, no need to re-download. The games that have those extra components are within the folder. Steam games, for example, even comes with a list of what needs to be installed elsewhere, and if there needs to be any registry keys added. But for the most part, both the Epic and Steam DRM free games can be just zipped and moved. I have not had any problems at all yet. The rest is convenience.
edit - anyway, this is shifting the goalposts of what jamesplayinggames was saying, neither him not me mentioned anything about archiving, just that you do not need internet to play the games, which, quite frankly, your post really has nothing to do with
and a very late edit regarding archiving, and a point I have made before - if archiving is the main thing, then installers are not the best way, what is best is to get all the software files 'as is'. If they come with an installers, the software files are hidden behind an extra layer, and in the future there may be problems with that extra layer. so the 'purer' the software files are, the better they are for archiving.