This formula has DoSnapshot CLI, which is helpful tool to automate snapshotting of your Digital Ocean droplets.
Just brew tap merqlove/do-snapshot and then brew install do_snapshot.
If the formula conflicts with one from mxcl/master or another tap, you can brew install merqlove/do-snapshot/do_snapshot.
You can also install via URL:
brew install https://raw.github.com/merqlove/homebrew-do-snapshot/master/do_snapshot.rb
brew help, man brew, or the Homebrew wiki.