Why do you want to pay attention to the contents update frequency snapshot
 

Only pay attention to home page snapshot update is not enough, some pages snapshot is key, why, because the quality of the contents can also affect your home page, it can be passed to the home page, the influence weight website ranking. The author has known in through the spider observation found that homepage snapshot of high weight every day update web site, its contents will happen periodically snapshot update, generally in two to three weeks for a period, if your site pages snapshot is 3 months or half a year ago, the description of your website pages quality is not high, low weight.

No idea about snapshot...