Where is Tomboy data stored?
Tomboy 0.15.6 and later
Configuration and add-ins: ~/.config/tomboy/
(NOTE: Tomboy actually follows the XDG Base Directory Spec here, so you can modify these locations by setting $XDG_DATA_HOME (defaults to ~/.local/share/), $XDG_CONFIG_HOME (defaults to ~/.config/), and $XDG_CACHE_HOME (defaults to ~/.cache/).
Mac OS X
Notes: ~/Library/Application Support/Tomboy/
Configuration and add-ins: ~/Library/Preferences/Tomboy/
Configuration and add-ins: %APPDATA%\Tomboy\config\
0.15.5 and earlier
All data was in one directory:
Other Configuration Notes
On any operating system, you can override the location of the note directory by setting the TOMBOY_PATH environment variable.