Assume you use "Synchronize Settings", the package of Atom Editor for synchronizing settings between multiple environments, and have taken a backup by mistake, you're able to rollback by following way faster than reverting each files with editing.
Clone your gist into your local.
$ git clone [your gist repo url]
Check git logs and get specific commitID you want to rollback to.
$ git log commit xxxxxxxxxxxxx
Rollback your local branch to commitID.
$ git reset --hard xxxxxxxxxxxxx
Once delete remote master.
$ git push origin :master
Push your rollbacked local commit to remote master.
$ git push origin master