ProfitTrain stores its files in two locations in your home directory:
If you ever want to backup/restore ProfitTrain these are the files you are interested in.
You may also notice a "Backup" folder in the "Application Support" folder. At launch ProfitTrain will optionally (see Preferences) make a copy of the main database file and store it here. Feel free to clean this out if you'd like to reclaim some hard drive space.