[tokai]

Think it through. Of cause you cant get the games files if the provider goes offline. You can make a backup of any of your games in steam, which will make it possible to install it again offline on other machines.

[flohofwoe]

The game won't run on another machine, at best you have a two weeks time window before the DRM checks start to fail.

There's this family sharing thing though, where you can share your Steam library between 5 accounts and up to 10 computers:

https://store.steampowered.com/promotion/familysharing