It was not right that there wasn't any kind of backup for such cases, it should be possible to switch to a different mirror temporarily, that does not sync as often. Where humans work, errors are made, mistake is if not calculated in that errors will occur.
This is rectified now, 2 mirrors are setup to sync less often, one once a week:
https://ca.kaosx.cf/
And one once a month:
https://kqtos.tk/repo/
I will make a sticky News announcement about these mirrors, but make sure to add them to your mirrorlist as an easy to use option.