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[[!meta title="what git-annex is not"]]
* git-annex is not a backup system. It may be a useful component of an
[[archival|use_case/bob]] system, or a way to deliver files to a backup
system.
For a backup system that uses git, take a look at
[bup](http://github.com/apenwarr/bup).
* git-annex is not unison, but if you're finding unison's checksumming
too slow, or its strict mirroring of everything to both places too
limiting, then git-annex could be a useful alternative.
* git-annex is more than just a workaround for git limitations that might
eventually be fixed by efforts like
[git-bigfiles](http://caca.zoy.org/wiki/git-bigfiles).
* git-annex is not some flaky script that was quickly thrown together.
I wrote it in Haskell because I wanted it to be solid and to compile
down to a binary. And it has a fairly extensive test suite. (Don't be
fooled by "make test" only showing a few dozen test cases; each test
involves checking dozens to hundreds of assertions.)
* git-annex is not [git-media](https://github.com/schacon/git-media),
although they both approach the same problem from a similar direction.
I only learned of git-media after writing git-annex, but I probably
would have still written git-annex instead of using it. Currently,
git-media has the advantage of using git smudge filters rather than
git-annex's pile of symlinks, and it may be a tighter fit for certain
situations. It lacks git-annex's support for widely distributed storage,
using only a single backend data store. It also does not support
partial checkouts of file contents, like git-annex does.
* git-annex is also not [boar](http://code.google.com/p/boar/),
although it shares many of its goals and characteristics. Boar implements
its own version control system, rather than simply embarcing and
extending git. And while boar supports distributed clones of a repository,
it does not support keeping different files in different clones of the
same repository, which git-annex does, and is an important feature for
large-scale archiving.
* git-annex is not the [Mercurial bfiles extension](http://mercurial.selenic.com/wiki/BfilesExtension).
Although mercurial and git have some of the same problems around large
files, and both try to solve them in similar ways (standin files using
mostly hashes of the real content).
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