The Internet Archive uses Redis for a lot of things. We use it as a read-only cache for all of the metadata about our &quot;items&quot; (books&#x2F;videos&#x2F;etc). We use it to store information about &quot;save page now&quot; pages in the Wayback Machine, so that you can immediately replay a saved page. (The main Wayback index is 60 TBytes; not in Redis today, maybe someday.)