SAN FRANCISCO — Ten years ago, Google was hacked by the Chinese military in one of the most startling cyberattacks on an American company by government-affiliated agents.

This week, Chronicle, a security start-up owned by Google’s parent company, Alphabet, plans to bring some of what it learned from that incident to other companies through a widely anticipated new product called Backstory.

The idea, company executives said, is simple: Backstory will make Alphabet’s vast storage, indexing and search abilities available to other companies, allowing them to search through giant volumes of data, going years back, to trace the back story of a malicious attack.

Chronicle is hardly the only company doing this. Dozens of companies promise so-called big data threat intelligence and storage. But many of their customers can’t afford to pay to search through huge amounts of information.