[CentOS-mirror] Disk space required

Hello,

We are setting up a new mirror for CentOS, and are curious as to how much space is required for a full mirror including all versions and dvd-images?

I can't find any information about this on the howto for a new mirror. Maybe this info could be added there, as I guess it would be useful info for more than us when setting up a new mirror... As it is now, we are doing a full rsync, but if it turns out it takes more space than we allocated, we might have to destroy the volume, make a new one, and start over... So it would be really useful to have this info before we started :)