You can easily append the tables with the template similar to one you’ve created to get YTD data. Just make sure your SELECT statement returns next weeks’ data, your target is a table you want your data to be added to (select “A single existing table” radiobutton on the Select Target page of the Data Import Wizard) and Truncate table checkbox on Select Target page of the Data Import Wizard is unchecked.
To automate deletion of data from the table use Execute Script activity. DELETE FROM statement in it should define the scope of rows you want to delete.