Licenses renew automatically each year through PayPal (see Buying Pro). If a license does expire, for example after you cancel, the Pro features switch off at the next weekly check. Your recipes, products, click counts, versions and settings stay in your database and come back when you renew.
If recipewp.com can’t be reached for a while, nothing changes on your site: Pro keeps the last good answer for a grace period, so a short outage on our side never switches your features off.