Please note the difference between “crawling” a backlink and “indexing” a backlink. First google crawls a website with their spider bots and so google knows about the content including your backlinks. At this stage your backlink gets counted and valued. Wheather the site gets indexed or not is decided by google’s AI and depends on various factors like domain authority, content quality, content length any many many more.
It is basically an automated agent of the search engine that crawls around your site and looks for pages for it to be indexed. It acts more of a web surfer of the digital world. Imagine Google Bots crawling zillions of pages every second, every day, they will end up consuming valuable online bandwidth, when they visit your site – resulting in slow website performance.
Metadata web indexing involves assigning keywords or phrases to web pages or web sites within a metadata tag (or "meta-tag") field, so that the web page or web site can be retrieved with a search engine that is customized to search the keywords field. This may or may not involve using keywords restricted to a controlled vocabulary list. This method is commonly used by search engine indexing.
What systems will you adopt for publishing your content? Systems are basically just repeatable routines and steps to get a complex task completed. They’ll help you save time and write your content more quickly, so you can stay on schedule. Anything that helps you publish content in less time without sacrificing quality will improve your bottom line.