How can I make my program remember data the user enters. I want my user to be able to back up their favorite folders by only entering the path in once.

I know I could use a textbox with the string for the path, or a directory tree. But I can't figure out how to keep the user from having to enter this in every time.

What my program will do is back up the folders to disk with only one click, without the user having to find all of the folders each time, or entering in the backup destination.

Thanks
Brandon