A third-party extension to Git that gives it features of a lazy, distributed file system and allows tracking huge binary files without special hardware demands.
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Pros
Pro Large files can be kept off-site until needed
Git-annex doesn't necessarily store all content everywhere you use the repository. Instead, you can check out only the files you need right now. Git-annex figures out automatically from which remote to fetch files when you do need them. This doesn't require a server, the files can also be on some USB hard drives, in which case Git-annex will tell you which drive you need to connect to get a particular file.
Cons
Con Doesn't work very well with NTFS
Many artists are stuck on Windows, but Git-Annex relies on symlinks which are only properly supported by Linux and OSX. It does have a direct mode which also works on NTFS drives, but in this mode in doesn't work as smoothly