In Finding a key binding definition in CodeRush @RoryBecker advocated putting all my custom keyboard shortcuts in a 'custom' folder. How do I ensure these settings are backed up, and also so that I can copy those settings from one development machine to another.
If you create all new shortcuts within a "Custom" folder then the file you'll need to backup is "Settings.XML\IDE\Shortcuts_Custom.xml" folder
The location of the Settings.XML folder will vary depending on your system and it's settings.
See this blogpost general help on settings and their location