GitHub can delete all issues, comments, and repositories

One of our contributors, catamphetamine (https://github.com/catamphetamine), who has created several open-source repositories we depend on and has submitted a lot of useful information in tickets, has been blocked from GitHub. When GitHub blocks a user, it also seems to destroy every comment, issue, and repository that they have ever created (ever), which means that you lose a lot of use full information. I love GitHub, but I can't afford to lose access to that level of knowledge. Does anyone have a way to backup your tickets or have a safer alternative to GitHub? Also is there any way to get all this information back?