I think that it is possible to restore the previous state but the question is, if it makes sense. When do you decide that it was a failure? Facebook explicitly

I think that it is possible to restore the previous state but the question is, if it makes sense. When do you decide that it was a failure? Facebook explicitly (even so automatically) told all others that they shouldn't use that routes anymore. When it comes to Facebooks side I guess they do have backups of their BGP config. Applying them (probably remotely) however seems to be harder then expected when the whole infrastructure is down.