You can back up the information in your tables one by one by downloading a copy of your data to Excel or .csv format.
To download a copy of your data, go to the table you wish to export and go to grid view. At the bottom of the grid you will see a link that says 'excel/csv'. Click that link, and the file will download to excel and open in excel. You can then save that file in either Excel or csv format.
If you do not see this option below your table, please contact your site admin and ask for permission to see export options.