save() saves any outstanding updates to
the site detail. Those changes will be lost if properties of the site change and the save
method is not called.
Example
var site = siteService.getSite("simple-site");
if(site){
var oldDescription = site.description;
site.description = "A new description";
site.save();
model.oldDescription = oldDescription;
model.newDescription = site.description;
}