In 1999, it took Google one month to crawl and build an index of about 50 million pages. In 2012, the same task was accomplished in less than one minute. The 2012 capability is about 50,000 times faster. This is slightly better than doubling the speed every year for 14 years.
In 2016, a new open-source Bubing web crawler was announced that can achieve around 12,000 crawled pages per second on a relatively slow connection. This is could be 1 billion pages per day. The pricing is about $40 per day. There is an arxiv article from 2016. (BUbiNG: Massive Crawling for the Masses) This is about the capability that Google had about ten to fifteen years ago.
a 64-core, 64 GB workstation it can download hundreds of million of pages at more than 10 000 pages per second respecting politeness both by host and by IP, analyzing, compressing and storing more than 160 MB/s of data.
It is about $200 for a 10 Terabyte hard drive. This would store about one hour of crawling.