In practice I think most people just don't care if ancient posts are lost. They aren't exactly the cultural cornerstones of the internet. This isn't a problem o

In practice I think most people just don't care if ancient posts are lost. They aren't exactly the cultural cornerstones of the internet. This isn't a problem often enough that your history is going to be empty most of the time. I think I only know of one occasion where an instance with ~20 users shut down with little warning.