writing documents

I am new to devonthink pro office. I am a mac user. I love being able to import all of my documents for viewing all at once. Here is my quandary. I am a writer and I have imported a project folder with word documents as well as all of my pdf’s into DT. If I edit a document or write something new while in DT it is not reflected in my project folder outside of DT correct? This would be the original folder that I used to import. OK if so, how do I know that the database is being backed up in time machine? Is it better to index documents that are constantly being changed? Not sure what to do. thanks