I was curious, so as a point of comparison, the latest Common Crawl [0] is 3.1 billion pages and 370 TB uncompressed. I would presume that Bing would be significantly larger given commercial interests.
If somehow Google and AskJeeves worked perfectly fine 20 years ago for millions of monthly users, I find it hard to believe a modern powerful computer lacks the resources to support a search engine for a single person.
What is the largest hard disk one can buy nowadays? I found a WD Gold 20TB. You'd need 19 of them plugged into your computer just to hold the uncompressed archive from Common Crawl.
[0]: https://commoncrawl.org/connect/blog/