How can this drop in disk space happen?

My stats this month show this curious drop in storage usage.


How can it happen?
I haven’t had downtime. And if it were due to somebody deleting and reuploading, I would have seen the effect on bandwidth (and bandwidth usage haven’t skyrocketed).

2 posts were merged into an existing topic: Wow, that’s weird [drop on “Disk Space Used This Month” graph]