Well, not necessarily. The issue is that filesystem corruption lead to undetected Git repository corruption, which is what made it possible to push corrupted repos to the mirrors.

It would have been just as easy to push those corrupted repos to all of the backup tapes in the rotating snapshot set. A snapshotting filesystem could be a good backup (and seems to be what one of the sysadmins is pushing for).

But even more important is to fail fast and identify git repo corruption as soon as it can be detected so that further damage can be avoided.