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A dump of database in some format that git can recognise may be help, but I'm not sure if there is a such format.
There are JSON and XML. You may get all posts-tags data relatively easy, and for updates there is change:<100 search.
i've wrote some scripts for making kona torrent and have "dump" in JSON format to play with.

imouto.json.gz from 29-Jan-2012, 21M
format sample

users interested in it have to build their own LAMP and danbooru to view it
you don't need full moebooru to search/view posts. simple java/.net app with built-in web server should be enough. also, we may try some tricks with web apps and file system api

personally, i use nginx as caching proxy for mirror and simple opera user js to patch images' location to it. this way new posts are stored on first view.
partial nginx conf