I need command with my command line -

every night I want the download to either update or 
replace existing download. It is downloading text files, 
so I don't know how it would update...only if a new create 
date maybe?
anyway, here is my command line, how do I fix it so every 
day is current?
httrack -w -
I0 <http://www.state.tn.us/commerce/reports/insurance/> -
O "C:\Automation\TNDatabase\Download\TNDatabase"