Best practices

Hi Garris,
I had a look at your Backstop project, it is really cool!
I am wondering if you can please share with me some of your thoughts regarding - 

1. Should we use it to validate the whole web page content as a single screenshot or better to have many individual components?

2. considering the fact that we have a very complex website, do you recommend uploading the screenshots to our codebase? (for allowing easier code review in bitbucket and comparing images while doing the review) is this a best practice?

3. Is there any way to handle this as part of the build process?

Thank you!