Note: This is taken from the Chicken Wiki, where a more recent version could be available.
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, gdbm, tiger-hash, z3, lzma, srfi-37. The gdbm and lzma eggs, at least, depend on the presence of third-party C libraries, as documented in their egg pages.