Heads up when saving projects to portable media

This is probably obvious but I'm a little slow so maybe I'll spare somebody a headache. I saved a project to a thumbdrive which was then removed. Next time I opened that project Sonar crashed. Long story short, it was looking for the project on the thumbdrive as I was trying to open it from the top link on the start screen - which linked to my most recent file which has the same name but which lived on the thumb drive.