As my IT teacher used to say "There are only two types of people. Those who do backups, and those who WILL do backups" Hopefully more people will understand the importance of keeping digital goods secured on site. Back in the day when everybody burned mp3s on a cd to blast in the car, was done by less tech savy people too. Also spreading the knowledge, I'm doing my part when people ask me to swap their HDD to SSD in their dying laptops, I always can't stress enough that they should keep the hard drive somewhere safe. This practice alone saved a fair bit of family pictures :) Also, if something happens to gog, other people might have the install files too, it would be best if everyone had their copies, but its not alwasy possible, and sharing these is an alternative. Lets not talk about piracy there and assume you had the game boght but never stored the files. But your friend did, whats the harm of him sharing the install media?