@ocdtrekkie Github wiki, gists, user pages are all stored in git repos. Rest isn't. I don't know about the equivilants on Gitlab.
Also, https://github-backup.branchable.com/ pulls all the data into a branch (and backs up all repos you star or fork); I wrote it 6 years ago partly to demonstrate feasibiity, partly to not lose information when the inevitable github backlash happened.