Automatic file backup

I'm inspired by a real world need I have to create utility in Liberty BASIC which will do the following:

1) Periodically examine a list of files in a folder to see if they have changed
2) Make a new folder with a unique name somewhere else to contain the updated files
3) Copy the changed files to the new folder

We can keep a list of paths and files in a file, create a simple gui for maintaining this list and starting and stopping the timer, and for displaying a log of activity.

In our next installment we will write the GUI code.