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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.

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

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