A lot. Beware “Archived Activities”: Salesforce’s quiet policy of hiding Task and Event records from end users after a year.*

Remember Salesforce storage is wildly expensive, hundreds or thousands of times more what it costs to store data in other clouds.

Archive-and-purge old Activities from Salesforce or pay the price!

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* The specifics: any

1. Event created more than 365 days ago,
2. Closed-Task-with-a-due-date due more than 365 days ago, or
3. Closed-Task-without-a-due-date created more than 365 days ago

disappears from Reports, Dashboards, and Related Lists. (You can see them by clicking “View All” buttons/links. In my experience, almost no one does that.)

I was also surprised to learn–just today!–that Salesforce enables customers to increase the 365-day threshold. The setting is called “Archive Days”, although beware performance degradation if you increase this too much.