You can sync HubSpot Sales engagements (emails, notes, meetings, tasks) with Salesforce activities and tasks to give you a view in Salesforce of the historical interactions with a lead or contact, or to be able to view rep productivity in aggregate.
For example, a scheduled event logged in HubSpot CRM:
Will sync over to Salesforce as a task/activity:
To turn on the feature, go to Integrations > Salesforce > Settings and turn on Task sync:
Please note: Existing HubSpot Sales engagements will not sync retroactively. After Task sync is enabled, any new tasks created in HubSpot will be synced over to Salesforce.