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zpaq is a incremental, journaling backup utility and archiver.


USE flags

USE flags for app-arch/zpaq Journaling incremental deduplicating archiving compressor

debug Enable extra debug codepaths, like asserts and extra output. If you want to get meaningful backtraces see
jit Enable just-in-time compilation for improved performance. May prevent use of some PaX memory protection features in Gentoo Hardened.
Cannot load package information. Is the atom app-arch/libzpaq correct?


Install app-arch/zpaq:

root #emerge --ask zpaq



Emerging app-arch/zpaq-extras provides a set of additional compression profiles for zpaq:

root #emerge --ask app-arch/zpaq-extras


  • zpaq add backup.zpaq /mnt/external/*

will only add the files whose last-modified date or size has changed since the previous backup.

A zpaq archive can contain at most 4 billion files and at most 250 terabytes of data after deduplication and before compression.

External resources