Debian has the packages and some decent README's for setting up a server. OpenAFS is a later version than the IBM AFS you might have seen in the 90s and it has

Debian has the packages and some decent README's for setting up a server. OpenAFS is a later version than the IBM AFS you might have seen in the 90s and it has all of the user-management and ACL-related features - which are quite useful for personal use (sharing files with specific friends, instead of the entire internet; insert-only directories are also useful for that kind of thing.) It's definitely not for most people - it's a lot of sysadmin work for a homelab (though it does get you volume-level replication and shuffling, but you don't really get much out of that unless you have at least two machines as servers.) You're also going to need a personal kerberos realm (which isn't much work, it's just One More Thing.)