The Ugarit egg provides both the command-line tool for the Ugarit backup/archival system and a library for accessing the underlying content-addressed store.
Documentation of the API will be forthcoming when round tuits are obtained. In the meantime, there is a nice online manual for Ugarit documenting its use as a backup/archival system.
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Many eggs are used to support the good work of Ugarit. The current list is miscmacros, sql-de-lite, crypto-tools, srfi-37, [[stty], matchable, autoload, regex, tiger-hash, posix-extras and parley. Also, aes, z3 and lzma can be used if they are installed.
See the Ugarit manual