It is google bot which do indexing/crawling and download the copy to its database

Google bot is really a internet search engine program that's responsible to locate and browse through web page sources to give them a cache certificate. They're also called bots and spiders...

Googlebot is Google's web crawling bot Crawling is the process by which Googlebot discovers new and updated pages to be added to the Google index. We use a huge set of computers to fetch billions of pages on the web.

Googlebot is Google's web crawling bot (sometimes also called a "spider"). Crawling is the process by which Googlebot discovers new and updated pages to be added to the Google index.

Googlebot is always crawling your site
It is used by Google to find and retrieve webpages. The information gathered by Googlebot is used to update the Google index.

Googlebot is Google's internet creep larva (sometimes additionally known as a "spider"). creep is that the method by that Googlebot discovers new and updated pages to be further to the Google index.

Googlebot is Google's web crawling bot (sometimes also called a "spider"). Crawling is the process by which Googlebot discovers new and updated pages to be added to the Google index. We use a huge set of computers to fetch (or "crawl") billions of pages on the web.