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You can use Outlook’s Auto Archive feature to automatically clear out and backup messages every few months or so.

https://support.microsoft.com/en-us/help/830119/description-of-the-autoarchive-feature-in-outlook

When you do this, the only copy of the archived messages will be in Outlook’s archive folder on the PC running Outlook, so you will probably want to make a backup of your Outlook files periodically to an external thumb drive or hard drive with these instructions:

https://support.office.com/en-us/article/Export-or-backup-email-contacts-and-calendar-to-an-Outlook-pst-file-14252b52-3075-4e9b-be4e-ff9ef1068f91