http://git-annex.branchable.com/
git-annex allows managing files with git, without checking the file contents into git. While that may seem paradoxical, it is useful when dealing with files larger than git can currently easily handle, whether due to limitations in memory, time, or disk space.
http://git-annex.branchable.com/encryption/
Encryption is needed when using special remotes like Amazon S3, where file content is sent to an untrusted party who does not have access to the git repository.
git-largefile for dropbox
http://mattn.kaoriya.net/software/lang/go/20130412130922.htm
http://dsas.blog.klab.org/archives/52105107.html
登録しておいた拡張子のファイルはハッシュ値だけをリポジトリに格納し、ファイルの内容は別のディレクトリやAmazon S3に格納する git-largefile/gits3
めも、未検証
