[emillon]

For that purpose I use ticgit which creates an unrelated branch in a git repository to store data. There's even a web client if you want to go fancy.

https://github.com/schacon/ticgit

[Tobu]

The last commit is two years old and points to: https://github.com/jeffWelling/ticgit

[mh-]

just a heads-up in case others overlook the note in the readme, the canonical repo is now at https://github.com/jeffWelling/ticgit

(per https://github.com/schacon/ticgit#readme)