Go to Settings → Advanced, and select "Add rule" under the General tab.
Then define:
which document types should be archived
which final statuses they must have
how long they should remain in those statuses before being archived
Finally, click "Save" to activate the rule.
Example:
In the example below, all invoices that have been in "Paid" or "Marked as paid" status for more than 60 days will be archived.
You can also choose to receive a notification when the rule runs, giving you an overview of the archived documents.
Note: Notifications are currently only sent to users with the Owner role.
Tip: You can set up multiple rules as needed.