If you are backing up more than 1,000 users or large SharePoint Sites in Office 365 with Keepit, we recommend you create four separate connectors, one for each of the main data areas - Exchange, OneDrive, Groups & Teams, and SharePoint. 

This will ensure a faster initial backup speed and a higher performing subfolder search.

You can use the same Microsoft Global administrator account for each connector. See also: Preparing your Office 365 account

For details on how to add a new connector, see: How to add a Cloud Connector for Office 365

For details on how to configure your connector, see: How to configure your backup

Remember to only select one data type for each connector. 

When you are configuring your Exchange data, select Calendar, Contacts, Mail, and Tasks: