Old screenshots will be deleted when they haven't been accessed for a while. How long exactly depends on the number of new screenshots per day.
112.
Domain (%(domain)s) is not indexed by Google. Maybe it is a new site or has been penalized by Google. Only reputable websites are accepted.
113.
Not everybody has a farm of legacy machines with older OSes and browsers. There are online services that offer screenshots of websites in different browsers for considerable fees. For the hobbyist and for open source projects, these fees may be prohibitive.
