We have a pretty detailed post-mortem on the timeline of events for the outage, as well as actions taken after it to prevent anything similar in the future (with links to related issues).
You can check it out in https://about.gitlab.com/2017/02/10/postmortem-of-database-o...
Re:GitHub Major Service Outage
by ChartsNGraffs on Wednesday May 31, 2017 @10:52AM
(#14452966)
They actually gained my trust from that outage.
If you paid for GitLab there was no missing-backups outage...
Do you have any evidence that Github does any better?
They haven't lost my data so far and they had to restore the production database at least once in their history. All circumstantial, but we'll have to wait and see.
Problems are to be expected. But as great as it is that they had multiple levels of backup, none of them worked. They hadn't even been tested.