perkeep/doc/prior-art.md

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# Prior Art & Related Projects
## Prior Art
* [LiveJournal](http://www.livejournal.org/)'s photo hosting, my first
experiment with content-addressable storage, which led to:
* [Brackup](http://code.google.com/p/brackup/), my original
content-addressable backup tool, but didn't store directories as the digest
of their contents. (so backup manifests were huge)
* [Git](http://git-scm.com/), which exposed me to the idea of hashing
directories, commits, etc. But git probably got it from Venti / Fossil:
* [Venti](http://en.wikipedia.org/wiki/Venti) /
[Fossil](http://en.wikipedia.org/wiki/Fossil_(file_system\)), apparently
pioneered the idea of recursive content-addressable file systems.
* [Monotone](http://www.monotone.ca/)'s "Certificates" are similar to Camli
claims.
Probably more, though. Contributions to this list are welcome!
## Related Projects
... and indeed, the community has pointed out several projects with some of the same goals:
* [Tahoe-LAFS](http://tahoe-lafs.org/)
* [Unhosted](http://unhosted.org/)