It's easy to export all of your data from Time and Billing to store somewhere else. But please note that the place you are exporting your data to must be able to accept/upload .csv files.
First, go to the "Admin" Tab.
Then click on the "Systems" Sub Tab.
Now, click the "Export" button halfway down the page.
An export file (.csv format) will be created. Click the blue link that appears to download the file to your computer.