Any distro really, but I am first and foremost interested in Debianoids and Rheloids.
Once in a while I hear of someone who insists on keeping a full local copy of an entire distro. According to wikipedia, Debian Jessie has more than 43000 packages. Suppose I want a local copy of all of them, on a system with limited access to the internet and the Debian repositories. This cannot occupy more than a 100 GB (which is reasonably cheap by today's standards). How would I even proceed getting them, for a given stable release? I mean the entire dependency graph of all the packages a distro has been working on for a given release...Scientific Linux/CentOS/RHEL have a dual layer "everything" DVD, but it's less than 7 GB, so I doubt it's really "everything".