When a lease is terminated, the tenants will be automatically archived in the system. Their information can still be accessed by going to your Tenants tab and toggling the available slider to show past tenants as demonstrated below.
Step 1: Click on Tenants in your account.
Step 2: Click Past.
You'll be able to see your past tenants in a list:
You will then have the option to View Tenant and access their information. From this page, you can also manage their lease and make any necessary updates (like adding them to a new lease) if they are still current tenants.