To add to cgaliher's comment, that would be using the built-in SBS backup utility.
You can still use tape backup but you will need to buy software such as Symantec's. However there is no need as the SBS backup works well.
http://www.symantec.com/business/products/sysreq.jsp?pcid=pcat_business_cont&pvid=296_1Or perhaps preferred, Storagecraft'S:
http://www.storagecraft.com/shadow_protect_SBS.php