Yes I noticed this as well from (the lack of) my own comment activity. I don't comment that often but I had written something yesterday that has disappeared.
On a more general note if anybody has backups and they aren't regularly tested restoring them, then you really don't have backups! As an added bonus, regular restoration tests let you practice for the "real deal" and you know how long the entire process will take.
One of the nicest ways I've experienced of making sure your backups are good is to sync up your development machine with them occasionally. Obviously there are situations like HIPAA where you can't do that, but if you can, do. You'll catch problems with your backups long before you actually need to use them.
IMO data loss is less a symptom of untested backups than it is of developer-managed systems. I wonder if ycombinator has a sysadmin (who isn't also a developer)?
On a more general note if anybody has backups and they aren't regularly tested restoring them, then you really don't have backups! As an added bonus, regular restoration tests let you practice for the "real deal" and you know how long the entire process will take.