>>60379assuming that steam will die one day and all the games purchased will be lost:
you can just transfer your entire steam directory to somewhere else, and play all the games in offline mode. this is basically a time capsule of all your purchases
but online features won't work in offline mode:
true, but games inevitably lose all their networking and servers anyways. you should not expect commercial games with a focus on online multiplayer and so on to remain playable. typiclly as soon as the playerbase dwindles the servers are cut