Files and Backup
TrailRunner not only stores information in your documents but also in files located in your user directory.
Your Diary is stored under 'yourhome'/Library/Application Support/TrailRunner/ActivityStore.sqlite
The Document containing your network of tracks and routes is being stored under 'yourhome'/Library/Application Support/TrailRunner/TrailRunner.trail
Background maps loaded from the net are cached under 'yourhome'/Library/Caches/TrailRunner/GeoTiles
Your Registration file is located under 'yourhome'/Library/Application Support/TrailRunner/Registration.trreg
Preferences are where they belong: 'yourhome'/Library/Preferences/com.berbie.trailrunner.plist
The list of supported WMS Map-Services is stored inside the application package: TrailRunner.app/Contents/Resources/MapServices.plist
Please note that that the diary information is not stored in the default document. Neither is your Track network being stored in the diary
If the GeoTiles folder gets too huge, you can remove whatever cached elements you like. This will not harm TrailRunner.