~None. It breaks too many assumptions when you can have the file system tree loop around on itself.~ Edit: WTF, apparently it's a core Apple Time Capsule feat

~None. It breaks too many assumptions when you can have the file system tree loop around on itself.~ Edit: WTF, apparently it's a core Apple Time Capsule feature. Okay. Cool. Never touching that. Edit²: https://arstechnica.com/gadgets/2011/07/mac-os-x-10-7/12/ https://arstechnica.com/gadgets/2011/07/mac-os-x-10-7/12/ claims that hard links are actually hidden files(?) on HFS+: > One particularly scary example is the implementation of hard links on HFS+. To keep track of hard links, HFS+ creates a separate file for each hard link inside a hidden directory at the root level of the volume. Hidden directories are kind of creepy to begin with, but the real scare comes when you remember that Time Machine is implemented using hard links to avoid unnecessary data duplication.