

GOG stands for Good Old Games and preserving those and fixing them to be playable on modern systems is part of their business plan. Install GOG Galaxy and you can install the games with a few clicks, after buying them of course.
https://www.gog.com/en/game/quake_ii_quad_damage
https://www.gog.com/en/game/quake_the_offering
Options if it’s to protect against local disasters such as fire:
Personally I would probably go for option two and bring the usb drive with me for a weekly coffee with my parents, they’d enjoy the visit and I enjoy knowing that my backup isn’t in the hands of Amazon. I’d go for option 1 if my internet was better.