How can I download all the software ( funtoo git repository) for offline use of funtoo, similiar to apt-mirror

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http://unix.stackexchange.com – I am working on a ship so once at sea I have no internet. The idea is to clone the complete git repository so that I can still install software when offine. I am using apt-mirror with debian which works great. I am looking to do something similiar with gentoo. (HowTos)