Hi everyone, is there a way (tools) to see the "history" of any given website in terms of Page or Domain Authority? Like if I went to Alexa and typed in www.angieslist.com it tells me the site ranks #**2,691 **Globally and #670 in the USA. But, is there a way to see how the rank has gone up over time, or where it was a year, two or more ago? Thanks

Don't miss interpret this... I DON'T mean hidden backlinks that you would stick on a page using html/css. What I am trying to figure out is if it's possible to create backlinks from sites that aren't visible by crawlers or SEO tools like Moz?... Does that make sense? Another words, let's say I place a visible/genuine/follow backlink to any external website from my blog. Is there a way to keep crawlers like Moz or other SEO tools from "seeing it"?

We moved a website over to a new domain name. We used 301 redirects to redirect all the pages individually (around 150 redirects). So my question is, when should we just kill the old site completely and just redirect (forward/point) the old domain over to the new one?